{"name":"口腔医学技术中级（师）题库","level":"中级（师）","org":"国家卫生健康部门","count":300,"questions":[{"id":1,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要为腭杆与组织面之间预留间隙，该间隙在耐火材料模型上的常规处理方式是","options":["在模型对应区域衬垫一层蜡片后复制耐火模型","在模型对应区域涂布分离剂后直接复制耐火模型","在模型对应区域刮除约0.5mm石膏后复制耐火模型","在模型对应区域贴附锡箔纸后复制耐火模型"],"answer":[0],"explanation":"知识点：铸造支架腭杆与组织间需预留间隙以容纳印模材料或缓冲。正确项：用蜡片衬垫翻制耐火模型，可精确形成所需间隙。错误项：仅涂分离剂不形成空间；刮除石膏会破坏模型形态且厚度难控；贴锡箔纸多用于局部隔离而非形成均匀间隙。","tier":"挑战"},{"id":2,"type":"single","stem":"可摘局部义齿铸造卡环在模型上完成蜡型后，安插铸造的位置通常应选在","options":["卡环臂最薄弱处附近","卡环体与支托连接处","卡环臂末端转角处","支托窝底面中央"],"answer":[1],"explanation":"知识点：铸造安插位置应有利于金属液补偿收缩。正确项：卡环体与支托连接处相对粗大，安插在此利于补缩。错误项：卡环臂薄弱处、臂末端转角处均易造成局部缩孔；支托窝底面中央会破坏支托形态及就位。","tier":"进阶"},{"id":3,"type":"single","stem":"在全口义齿排牙时，若后牙排列过于偏向牙槽嵴顶舌侧，最可能导致","options":["义齿基托边缘封闭增强","舌侧空间增大、舌活动受限","咀嚼时义齿翘动减小","前牙覆覆盖关系改善"],"answer":[1],"explanation":"知识点：全口义齿后牙应排在牙槽嵴顶上。正确项：偏舌侧会占据舌侧空间，导致舌活动受限。错误项：偏舌侧不利于边缘封闭；会加重义齿翘动而非减小；对前牙覆覆盖无直接改善作用。","tier":"进阶"},{"id":4,"type":"single","stem":"某技师在制作金属烤瓷冠时，发现瓷层在金属基底边缘处反复出现气泡，最可能的原因是","options":["金属基底表面过度喷砂粗化","瓷粉堆塑时振动不足","金属基底除气不充分","瓷层烧结温度低于常规"],"answer":[2],"explanation":"知识点：金属烤瓷冠气泡常见原因包括基底除气不足、表面污染等。正确项：除气不充分会使金属内气体在烧结时逸出形成气泡。错误项：过度喷砂粗化不直接产气；振动不足主要致瓷层致密度差；烧结温度低影响瓷化而非产气。","tier":"挑战"},{"id":5,"type":"single","stem":"患者试戴可摘局部义齿时，义齿就位后出现明显的翘动，检查发现支托与支托窝未完全贴合，正确的处理方法是","options":["调磨基托边缘缓解翘动","调改支托使之与支托窝贴合","增加卡环臂的卡抱力","重新取模制作义齿"],"answer":[1],"explanation":"知识点：支托与支托窝不贴合是义齿翘动的常见原因。正确项：调改支托使其与支托窝贴合可消除支点。错误项：调磨基托边缘不能解决支托支点问题；增加卡抱力不消除翘动；重新取模非首选，应先调改。","tier":"挑战"},{"id":6,"type":"single","stem":"使用石膏灌注印模时，为减少气泡，正确的操作是","options":["将石膏从印模高处单一位置连续注入","将石膏从印模低位缓慢注入并振动","先注满一侧再注另一侧","将石膏快速倒入印模中央"],"answer":[1],"explanation":"知识点：石膏灌注应避免气泡。正确项：从低位缓慢注入并振动有利于气泡逸出。错误项：单点连续注入、先注满一侧、快速倒入中央均易卷入气泡。","tier":"基础"},{"id":7,"type":"single","stem":"制作树脂基托时，自凝树脂与热凝树脂相比，其聚合特点是","options":["聚合放热较低且聚合更完全","聚合放热较高且残余单体较多","聚合放热较低且残余单体较少","聚合放热较高且聚合更完全"],"answer":[1],"explanation":"知识点：自凝与热凝树脂聚合特性差异。正确项：自凝树脂聚合放热较高、残余单体较多。错误项：自凝并非聚合更完全或残余单体更少；放热并非较低。","tier":"基础"},{"id":8,"type":"single","stem":"在焊接钴铬合金支架时，为减少焊接变形，通常采取的措施是","options":["提高焊接温度至合金熔点附近","采用大火焰快速加热焊接区","对焊接件进行整体预热并对称焊接","焊接后立即投入冷水中冷却"],"answer":[2],"explanation":"知识点：焊接变形控制。正确项：整体预热并对称焊接可使应力分布均匀，减少变形。错误项：接近熔点温度易过烧；大火焰快速加热造成局部热应力；焊后立即冷水冷却会加剧变形。","tier":"基础"},{"id":9,"type":"single","stem":"某患者戴用全口义齿后主诉说话时义齿有哨音，技师检查发现腭部基托前部形态过厚且边缘锐利，正确的处理是","options":["调磨下颌义齿后牙区基托","修整上颌腭部基托形态并圆钝边缘","增加上颌基托厚度以改变共鸣","降低下牙槽嵴区基托高度"],"answer":[1],"explanation":"知识点：全口义齿哨音常因腭部形态或边缘不当所致。正确项：修整腭部基托形态并圆钝边缘可改善气流。错误项：调磨下颌后牙区基托与哨音无关；增加厚度会加重问题；降低下牙槽嵴区基托不针对上腭形态。","tier":"挑战"},{"id":10,"type":"single","stem":"铸造陶瓷全冠在口内试戴时，检查邻接关系过紧，最合适的处理方法是","options":["用超细金刚砂车针缓慢调磨邻接面","用咬合纸检查后直接锤击就位","用热水浸泡使其膨胀后试戴","调磨对颌牙邻面以增加间隙"],"answer":[0],"explanation":"知识点：陶瓷全冠邻接过紧的处理。正确项：用超细金刚砂车针缓慢调磨邻接面可精确调整。错误项：锤击易致瓷裂；热水浸泡不能改变邻接尺寸；调磨对颌牙不符合治疗原则。","tier":"挑战"},{"id":11,"type":"single","stem":"在制作可摘局部义齿时，若模型上观测线显示基牙倒凹深度较大，卡环臂应","options":["进入倒凹较深以增强固位","进入倒凹较浅以利于摘戴","不进入倒凹仅起支持作用","进入倒凹深度越大越好"],"answer":[1],"explanation":"知识点：卡环臂进入倒凹深度需适度。正确项：倒凹大时进入较浅，利于摘戴且避免损伤基牙。错误项：进入过深会造成摘戴困难或基牙损伤；不进入倒凹则固位不足；深度越大越好显然错误。","tier":"进阶"},{"id":12,"type":"multi","stem":"关于全口义齿印模的要求，下列叙述正确的有","options":["功能性印模需在肌功能整塑下取得边缘形态","印模应完整覆盖上颌结节及下颌磨牙后垫","解剖式印模边缘应充分伸展至黏膜转折处","印模材料凝固后可直接从口内强行取出","上颌印模后缘应超过腭小凹之后"],"answer":[0,1],"explanation":"知识点：全口义齿印模基本要求。正确项：功能性印模需肌功能整塑；印模需覆盖上颌结节和磨牙后垫。错误项：解剖式印模边缘并非一律充分伸展至转折处；凝固后强行取出会变形；上颌后缘不应超过腭小凹之后。","tier":"挑战"},{"id":13,"type":"single","stem":"制作钴铬合金铸造支架时，模型上的工作区填倒凹后，耐火材料模型表面涂布间隙漆的主要作用是","options":["补偿合金铸造收缩","形成铸件与基牙间的粘固间隙","防止铸造时模型表面开裂","提高支架与口腔黏膜的密合度"],"answer":[1],"explanation":"知识点：铸造支架间隙漆的作用。间隙漆涂布于耐火材料模型基牙表面，用于补偿合金铸造收缩和高温膨胀，形成铸件与基牙间的粘固间隙，保证就位。A项补偿铸造收缩主要通过模型放大和间隙漆共同完成，但间隙漆的核心作用是形成粘固间隙，单独说补偿收缩不准确；C项耐火材料模型表面开裂与间隙漆无关，与材料配比和干燥工艺有关；D项支架与黏膜的密合度取决于印模和模型精度，与间隙漆无关。","tier":"基础"},{"id":14,"type":"single","stem":"可摘局部义齿支架铸造后出现表面粗糙、粘砂，最可能的原因是","options":["铸造温度过高导致合金过烧","铸型内壁涂料的耐火度不足","熔金时未加脱氧剂","冷却速度过快产生内应力"],"answer":[1],"explanation":"知识点：铸造支架表面缺陷原因分析。粘砂和表面粗糙多因铸型内壁涂料耐火度不足，合金液与型壁材料发生化学反应或渗透所致。A项铸造温度过高主要引起合金过烧、晶粒粗大，表现为力学性能下降而非粘砂；C项未加脱氧剂导致合金氧化夹杂，表现为内部气孔和夹渣；D项冷却过快产生内应力，表现为变形或裂纹，与表面粗糙无关。","tier":"基础"},{"id":15,"type":"single","stem":"全口义齿排牙时，上颌后牙排列的补偿曲线曲度主要取决于","options":["患者面部宽度","髁导斜度","切导斜度","牙尖高度"],"answer":[1],"explanation":"知识点：全口义齿平衡牙合五因素。补偿曲线曲度与髁导斜度呈正相关，髁导斜度越大，补偿曲线曲度越大。A项面部宽度影响牙弓大小而非补偿曲线；C项切导斜度主要影响前牙覆牙合覆盖关系；D项牙尖高度影响侧方牙合平衡，不直接决定补偿曲线曲度。","tier":"基础"},{"id":16,"type":"single","stem":"在石膏模型上制作个别托盘时，托盘边缘应比功能印模边缘短约","options":["0.5mm","2~3mm","5~6mm","8~10mm"],"answer":[1],"explanation":"知识点：个别托盘制作要求。个别托盘边缘应比功能印模边缘短2~3mm，以便放置边缘整塑材料。A项0.5mm过短，无法容纳足够的整塑材料；C项5~6mm和D项8~10mm过长，会导致整塑材料过厚、边缘形态不准确。","tier":"基础"},{"id":17,"type":"single","stem":"某技师在制作铸造桩核蜡型时，发现桩的长度已达到根长的2/3，但根尖部封闭不足，正确的处理方式是","options":["维持现有长度，增加桩的直径","延长桩的长度至根尖1mm处","维持现有长度，在根尖处加蜡封闭","缩短桩长，增加核的厚度"],"answer":[1],"explanation":"知识点：铸造桩核桩长设计原则。桩的长度应达根长的2/3~3/4，同时根尖部需保留至少3~5mm根充材料封闭，因此桩应延长至根尖1mm处以保证固位和封闭。A项增加直径会增加根折风险，且不能解决根尖封闭问题；C项加蜡封闭不能解决桩长不足导致的固位力下降；D项缩短桩长会进一步降低固位力。","tier":"挑战"},{"id":18,"type":"single","stem":"金瓷修复体中，金属基底冠的瓷结合面喷砂处理时，最适宜使用的氧化铝颗粒粒度是","options":["25μm","50μm","110μm","250μm"],"answer":[1],"explanation":"知识点：金瓷结合面处理。金属基底冠瓷结合面喷砂常用50μm氧化铝颗粒，既能形成均匀粗糙面增加机械结合，又不会过度磨损金属表面。A项25μm颗粒过细，粗化效果不足；C项110μm和D项250μm颗粒过粗，会造成金属表面过度磨损和瓷层气泡。","tier":"进阶"},{"id":19,"type":"single","stem":"某患者全口义齿戴用后诉说话时义齿易脱落，检查发现义齿基托边缘在磨牙后垫区伸展不足，正确的处理是","options":["加长磨牙后垫区基托边缘","磨短磨牙后垫区基托边缘","增加后堤区基托厚度","调磨义齿后牙牙尖"],"answer":[0],"explanation":"知识点：全口义齿基托边缘伸展与固位。磨牙后垫区基托边缘应覆盖磨牙后垫的1/2~2/3，伸展不足会破坏边缘封闭导致义齿脱落，应加长该区基托边缘。B项磨短会进一步破坏封闭；C项增加后堤区厚度与磨牙后垫区边缘封闭无关；D项调磨后牙牙尖影响咬合平衡而非边缘封闭。","tier":"挑战"},{"id":20,"type":"single","stem":"可摘局部义齿设计时，Kennedy第二类缺损的义齿支持形式通常为","options":["牙支持式","混合支持式","黏膜支持式","骨支持式"],"answer":[1],"explanation":"知识点：Kennedy分类与义齿支持形式。Kennedy第二类为单侧游离端缺失，义齿由基牙和黏膜共同支持，为混合支持式。A项牙支持式适用于Kennedy第三类；C项黏膜支持式适用于全口义齿或肯氏一类且无基牙支持时；D项骨支持式不属于可摘局部义齿的支持形式。","tier":"进阶"},{"id":21,"type":"single","stem":"某技师在制作烤瓷熔附金属全冠时，发现瓷层烧结后出现气泡，排查发现金属基底冠表面在喷砂后用手指触摸过，最可能导致气泡的环节是","options":["金属表面残留油脂影响瓷润湿","手指触摸导致金属表面氧化","触摸使金属表面粗糙度降低","手指温度影响金属热膨胀"],"answer":[0],"explanation":"知识点：金瓷结合面污染与气泡形成。手指触摸会在金属表面留下油脂，烧结时油脂燃烧产生气体，导致瓷层气泡。B项手指触摸不会导致金属氧化；C项触摸不会改变喷砂形成的粗糙度；D项手指温度对金属热膨胀无实质影响。","tier":"挑战"},{"id":22,"type":"single","stem":"制作钴铬合金铸造支架时，模型上填倒凹后需要缓冲的部位通常是","options":["基牙舌侧倒凹区","组织倒凹区","支托凹底部","模型缺损区"],"answer":[1],"explanation":"知识点为可摘局部义齿支架制作中的模型处理。组织倒凹区需要缓冲，避免义齿就位时压伤软组织；基牙舌侧倒凹区是填倒凹形成就位道的区域，不是缓冲；支托凹底部需保持清晰以承托支托；模型缺损区应修补而非缓冲。","tier":"基础"},{"id":23,"type":"single","stem":"用藻酸盐印模材制取印模时，调拌时间过长会导致","options":["印模材流动性下降","印模表面气泡增多","印模材凝固时间延长","印模与托盘粘结力增强"],"answer":[0],"explanation":"知识点为藻酸盐印模材的调拌性能。调拌时间过长使材料开始凝固、流动性下降，影响细节复制；气泡增多主要与调拌手法有关；凝固时间主要由粉水比和水温决定；粘结力与托盘穿孔和材料性能有关，调拌过长不会增强粘结。","tier":"基础"},{"id":24,"type":"single","stem":"石膏模型灌注后，通常应在多久后脱模较为合适","options":["10分钟内","30分钟至1小时","12小时以后","24小时以后"],"answer":[1],"explanation":"知识点为石膏凝固与脱模时机。普通熟石膏约30分钟至1小时达到足够强度可脱模；10分钟内尚未凝固易变形；12小时和24小时后虽强度更高，但过早干硬脱模反而易损伤模型细节，且临床无需等待这么久。","tier":"基础"},{"id":25,"type":"single","stem":"固定桥熔模制作时，桥体龈端与模型之间需要预留的间隙主要作用是","options":["便于铸造时排气","为粘接剂提供溢出空间","补偿合金收缩","防止焊接变形"],"answer":[1],"explanation":"知识点为固定桥桥体设计。桥体龈端预留间隙是为粘接剂提供溢出空间并便于清洁；排气靠铸道和排气道；合金收缩靠铸造补偿；焊接变形与焊接工艺有关。","tier":"基础"},{"id":26,"type":"single","stem":"全口义齿排牙时，后牙牙合平面应大致平行于","options":["眶耳平面","鼻翼耳屏线","下颌骨下缘","瞳孔连线"],"answer":[1],"explanation":"知识点为全口义齿牙合平面定位。鼻翼耳屏线是常用参考线，后牙牙合平面大致与之平行；眶耳平面和瞳孔连线主要用于前牙区参考；下颌骨下缘不是牙合平面定位标志。","tier":"基础"},{"id":27,"type":"single","stem":"可摘局部义齿铸造卡环的固位臂通常应位于基牙的","options":["倒凹区","非倒凹区","牙合面","龈缘以下"],"answer":[0],"explanation":"知识点为卡环固位原理。固位臂尖端进入基牙倒凹区才能产生固位力；非倒凹区无固位作用；牙合面不能放置固位臂；龈缘以下会刺激牙龈。","tier":"基础"},{"id":28,"type":"single","stem":"某患者全口义齿戴用后主诉咀嚼时义齿翘动，检查发现后牙区基托与黏膜不密合，此时较合理的处理是","options":["直接调磨基托边缘","重新衬垫或重做基托","仅调磨后牙牙尖","嘱患者适应一段时间"],"answer":[1],"explanation":"知识点为全口义齿翘动的处理。基托与黏膜不密合导致翘动，应重新衬垫或重做基托以恢复密合；调磨边缘不能解决不密合；调磨牙尖不解决支持问题；单纯适应不能消除翘动。","tier":"挑战"},{"id":29,"type":"single","stem":"制作金属烤瓷冠时，金属基底冠的厚度不足最可能导致","options":["瓷层颜色偏白","金属基底变形或瓷裂","粘接剂溶解加快","印模精度下降"],"answer":[1],"explanation":"知识点为金属基底冠设计。金属基底过薄强度不足，易在烤瓷或使用中变形，导致瓷层开裂；颜色偏白与瓷层厚度和遮色有关；粘接剂溶解与边缘密合有关；印模精度在印模阶段决定。","tier":"基础"},{"id":30,"type":"single","stem":"使用自凝树脂修补义齿基托时，操作中在树脂面团期加压的主要作用是","options":["排除气泡并使树脂密实","加速树脂聚合反应","降低树脂收缩率","提高树脂透明度"],"answer":[0],"explanation":"知识点为自凝树脂修补基托的操作要点。面团期加压可使树脂密实并排出气泡；聚合速度由引发剂和温度决定；加压不能降低收缩率；透明度与材料本身和气泡有关，加压主要排除气泡。","tier":"挑战"},{"id":31,"type":"single","stem":"某技师在铸造钴铬合金支架时，铸道方向设置不当，最可能直接造成","options":["铸件表面粗糙","铸件缩孔或浇不足","模型材料膨胀过大","包埋料凝固时间缩短"],"answer":[1],"explanation":"知识点为铸造工艺中铸道设计。铸道方向不当会影响金属液流动和补缩，导致缩孔或浇不足；表面粗糙多与包埋料和铸造温度有关；模型膨胀由材料决定；包埋料凝固时间与粉水比和温度有关，与铸道方向无关。","tier":"进阶"},{"id":32,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要填倒凹的部位主要是为了","options":["保证支架顺利就位并防止压伤牙龈","增加支架与基牙的机械嵌合固位","补偿合金铸造后的线收缩量","预留开孔以便包埋材料排气"],"answer":[0],"explanation":"填倒凹的目的是消除阻碍支架就位的倒凹区，使支架能顺利戴入且不压迫牙龈。增加机械嵌合固位靠卡环设计而非填倒凹；补偿铸造收缩靠模型放大或铸造补偿；包埋排气靠排气道设置，均与填倒凹无关。","tier":"基础"},{"id":33,"type":"single","stem":"可摘局部义齿基托蜡型在完成前进行\"烫蜡\"操作，其主要作用是","options":["使蜡型表面光滑并消除蜡屑与气泡","降低蜡型整体厚度便于装盒","提高蜡型硬度防止装盒变形","封闭石膏模型表面微孔"],"answer":[0],"explanation":"烫蜡是用热蜡刀或火焰轻扫蜡型表面，使表面熔融光滑、消除蜡屑和气泡。降低厚度靠刮除多余蜡；提高硬度不是烫蜡目的；封闭模型微孔靠涂分离剂，均非烫蜡作用。","tier":"基础"},{"id":34,"type":"single","stem":"琼脂印模材料在口腔修复中复模时，加热熔化后应冷却到多少温度再灌注","options":["约52～55℃","约70～75℃","约37～40℃","约90～95℃"],"answer":[0],"explanation":"琼脂熔化后需冷却至约52～55℃的凝胶点附近再灌注，温度过高会烫伤模型或患者，过低则已凝固无法流动。70℃以上仍过稀易流动且温度高；37～40℃已接近凝固难以灌注；90℃以上为熔化状态易造成损伤。","tier":"进阶"},{"id":35,"type":"single","stem":"焊接钛及钛合金修复体时，不能采用普通火焰钎焊的主要原因是","options":["高温下钛易与氧氮氢反应导致脆化","钛的熔点低于常用钎料熔点","钛的热导率过高使加热不均","钛的线膨胀系数远大于钎料"],"answer":[0],"explanation":"钛在高温下化学活性极高，易吸收氧、氮、氢形成脆性化合物，故需在惰性气体或真空下焊接。钛熔点高而非低于钎料；热导率较低；线膨胀系数与钎料差异并非禁用火焰焊的主因。","tier":"基础"},{"id":36,"type":"single","stem":"全口义齿排牙时，上颌后牙牙合平面应位于","options":["与瞳孔连线平行并约平分磨牙后垫高度","与鼻翼耳屏线平行并位于舌侧缘下方","与眶下缘平行并高出磨牙后垫一半","与下颌牙合平面平行并紧贴磨牙后垫"],"answer":[0],"explanation":"上颌后牙牙合平面通常与瞳孔连线平行，前部约在唇下2mm，后部约平分磨牙后垫高度，符合解剖生理。与鼻翼耳屏线平行主要指导前牙位置参考；后牙牙合平面并非位于舌侧缘下方；与眶下缘平行及紧贴磨牙后垫均不符合排牙原则。","tier":"基础"},{"id":37,"type":"single","stem":"制作金属烤瓷冠时，金瓷结合中起主要化学结合作用的是","options":["金属表面氧化膜与瓷中的氧化物结合","金属与瓷的机械锁结作用","金属与瓷的热膨胀系数匹配","金属表面的范德华力吸附"],"answer":[0],"explanation":"金瓷结合以化学结合为主，金属表面适量氧化膜与瓷中氧化物发生化学键合。机械锁结是辅助作用；热膨胀系数匹配保证结合稳定但非化学结合本身；范德华力作用较弱，非主要机制。","tier":"基础"},{"id":38,"type":"single","stem":"某技师在铸造钴铬合金支架时，铸圈焙烧后未充分冷却即进行铸造，最可能导致","options":["铸件产生气孔与铸造不全","铸件表面过度光滑","铸件尺寸明显缩小","包埋材料强度显著提高"],"answer":[0],"explanation":"铸圈温度过高时铸造，合金液与包埋料温差大，易产生气孔、铸造不全及表面粗糙。温度过高不会使表面更光滑；尺寸缩小多与收缩补偿有关；包埋料强度提高与冷却与否关系不大。","tier":"进阶"},{"id":39,"type":"single","stem":"患者戴用可摘局部义齿后主诉咀嚼时义齿翘动，检查发现游离端基托下黏膜压痛，最可能的原因是","options":["游离端基托未充分伸展或缓冲不足","卡环臂进入倒凹过深","人工牙牙尖斜度过大","基托边缘过长压迫系带"],"answer":[0],"explanation":"游离端义齿咀嚼时基托下沉，若伸展不足或缓冲不够，压力集中导致黏膜压痛和翘动。卡环进入倒凹过深主要导致就位困难或卡环疲劳；牙尖斜度过大影响咀嚼效率；边缘过长主要压迫系带区。","tier":"挑战"},{"id":40,"type":"single","stem":"在制作全口义齿个别托盘时，使用光固化树脂材料的主要优点是","options":["可在模型上直接塑形并精确控制厚度","固化后无需修整即可使用","材料硬度高于自凝树脂","固化过程不产生任何气味"],"answer":[0],"explanation":"光固化树脂片可在模型上直接铺塑，光照固化，厚度较易控制并便于修整。固化后仍需修整边缘；硬度不一定高于自凝树脂；固化时仍可能有气味，均非其主要优点。","tier":"基础"},{"id":41,"type":"single","stem":"研磨铸造金属全冠时，调整邻接关系过紧的正确处理方法是","options":["用细砂石少量磨除邻面接触区后抛光","用粗砂轮快速磨除大量邻面金属","用咬合纸检查后直接戴入患者口内","加热冠体使金属膨胀后试戴"],"answer":[0],"explanation":"邻接过紧应选用细砂石少量、均匀磨除接触区，随后抛光恢复光滑。粗砂轮快速大量磨除易造成邻接丧失；过紧未调直接戴入会压迫邻牙；加热膨胀不能解决邻接过紧且会变形。","tier":"基础"},{"id":42,"type":"single","stem":"烤瓷熔附金属修复体中，金属基底冠的厚度一般要求不小于","options":["0.3mm","0.1mm","0.05mm","0.8mm"],"answer":[0],"explanation":"金属基底冠通常要求厚度约0.3～0.5mm，以保证强度和抗变形。0.1mm及0.05mm过薄易变形；0.8mm过厚会过多磨除牙体并影响瓷层空间。","tier":"基础"},{"id":43,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需先填补倒凹，下列部位中通常应作缓冲处理的是","options":["基牙颊侧倒凹区","基牙舌侧倒凹区","组织面骨隆突区","卡环臂进入倒凹区"],"answer":[2],"explanation":"知识点为铸造支架模型处理中的缓冲与填倒凹区别。骨隆突等组织倒凹区需缓冲，避免基托压迫黏膜；基牙颊舌侧倒凹通常填倒凹，使卡环臂按设计进入倒凹；卡环臂进入的倒凹区属于需保留的工作倒凹，不应缓冲。","tier":"进阶"},{"id":44,"type":"single","stem":"用自凝树脂修补义齿基托折裂处时，为保证修补后基托颜色和强度较接近，正确的操作是","options":["直接涂单体溶胀折裂面后填自凝树脂","磨除折裂面后仅用自凝树脂堆塑","磨出粗糙面后用单体溶胀再填自凝树脂","将折裂面抛光后涂分离剂再填自凝树脂"],"answer":[2],"explanation":"知识点为自凝树脂修补基托的界面处理。磨出粗糙面并用单体溶胀可使新旧树脂形成较好结合；直接涂单体不磨粗糙面结合不足；仅堆塑不溶胀易分层；涂分离剂会阻碍新旧树脂结合。","tier":"挑战"},{"id":45,"type":"single","stem":"全口义齿排牙时，若下颌后牙排列偏向舌侧过多，最可能引起的问题是","options":["义齿固位力明显增大","舌活动空间减小","咀嚼效率明显提高","基托边缘封闭增强"],"answer":[1],"explanation":"知识点为全口义齿后牙排列位置与舌功能空间。后牙偏舌侧会侵占舌活动空间，影响舌运动并可能造成不适；固位力主要与边缘封闭、吸附力等有关，不因偏舌侧而增大；咀嚼效率不会因此提高；基托边缘封闭与后牙排列位置无直接关系。","tier":"进阶"},{"id":46,"type":"single","stem":"铸造全冠蜡型制作时，为保证邻面接触区形态恢复，正确的做法是","options":["邻面蜡型恢复自然接触区后直接包埋","邻面蜡型加蜡形成明显过凸接触点","邻面蜡型恢复接触区后再修整外形","邻面蜡型不加蜡完全复制预备体"],"answer":[2],"explanation":"知识点为全冠蜡型邻面接触区恢复。应先恢复接触区再修整外形，使接触位置和松紧合适；直接包埋未修整可能形态不良；过凸接触点会造成邻牙移位或就位困难；完全复制预备体会失去接触。","tier":"进阶"},{"id":47,"type":"single","stem":"可摘局部义齿支架铸造后，发现卡环臂与模型设计位置相比稍短，正确的处理是","options":["直接用于患者口内试戴观察","将卡环臂弯制延长后使用","重新制作蜡型并铸造","磨短卡环臂使其与基牙贴合"],"answer":[2],"explanation":"知识点为铸造支架缺陷处理原则。卡环臂短会造成固位不足，应重新制作蜡型铸造；直接试戴可能固位不良；弯制延长会破坏铸造卡环性能；磨短会使卡环更短，无法进入设计倒凹。","tier":"挑战"},{"id":48,"type":"multi","stem":"关于可摘局部义齿基托蜡型制作，下列做法中正确的有","options":["基托边缘应恢复至模型边缘并稍厚","基托组织面应保持光滑无气泡","基托厚度应均匀且符合设计","基托边缘可越过模型边缘少许","基托表面应雕刻出根形轮廓"],"answer":[0,1,2],"explanation":"知识点为可摘局部义齿基托蜡型要求。边缘应恢复至模型边缘并稍厚以保证封闭和强度；组织面应光滑无气泡；厚度应均匀符合设计。边缘越过模型边缘会导致基托过长；基托表面雕刻根形轮廓不是基托蜡型的常规要求。","tier":"挑战"},{"id":49,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要为支架的固位体部分预留出约0.25mm的间隙，这一间隙在耐火材料模型上通常通过哪种方式获得","options":["在模型表面均匀涂布一层间隙漆后直接包埋","在模型固位体区域衬垫一层蜡片后再复制耐火模型","在复制耐火模型前于工作模型表面喷涂专用间隙涂料","在铸造完成后对支架固位体内表面进行酸蚀处理"],"answer":[2],"explanation":"知识点：铸造支架固位体与基牙间需留出粘接剂间隙，该间隙通过在工作模型表面涂布专用间隙涂料获得。正确项对：间隙涂料涂布于工作模型后可翻制到耐火模型上，形成均匀的0.25mm间隙。A错在间隙漆需涂在模型而非直接包埋，且包埋后无法复现间隙。B错在固位体间隙是整体均匀涂层，不是局部蜡片衬垫。D错在酸蚀是铸后表面处理，不能形成装配间隙。","tier":"挑战"},{"id":50,"type":"multi","stem":"某技师在制作全口义齿时，发现患者下颌牙槽嵴吸收严重、系带附着接近嵴顶，在排下颌前牙时正确的处理包括哪些","options":["适当磨改下颌前牙人工牙的盖嵴部以减少唇侧突出","将下颌前牙排列在牙槽嵴顶稍偏唇侧以恢复唇丰满度","排牙时避开系带区，使义齿基托边缘让开系带附着","为补偿牙槽嵴吸收，可将下颌前牙区基托做成厚一些"],"answer":[0,2],"explanation":"知识点：重度吸收下颌牙槽嵴的排牙原则。A对：磨改盖嵴部可减少前牙唇侧突度，使人工牙更贴近牙槽嵴顶。C对：基托边缘必须避让系带附着，否则义齿脱位。B错：重度吸收时应排向牙槽嵴顶偏舌侧而非唇侧，偏唇侧会形成杠杆致脱位。D错：基托局部加厚不能补偿骨吸收，反而增加重量和不适。","tier":"挑战"},{"id":51,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要填倒凹的区域应位于","options":["基牙颊侧轴面角至邻面倒凹区","基牙舌侧轴面角至邻面倒凹区","缺牙区牙槽嵴顶至颊侧前庭沟","组织倒凹区及骨性倒凹区"],"answer":[0],"explanation":"知识点：可摘局部义齿铸造支架模型填倒凹的部位。正确项对：颊侧轴面角至邻面倒凹区属于需要填除的倒凹，以保证支架就位。舌侧轴面角至邻面倒凹区属应保留倒凹区，填除会破坏卡环固位；缺牙区牙槽嵴顶至颊侧前庭沟是基托覆盖区，不是填倒凹部位；组织倒凹区及骨性倒凹区属于需缓冲的部位，与填倒凹概念不同。","tier":"基础"},{"id":52,"type":"single","stem":"采用失蜡铸造法制作金属全冠时，蜡型表面出现橘皮样皱褶，最可能的原因是","options":["蜡液温度过高后自然冷却","蜡液温度过低时反复涂抹","模型表面涂布了过多分离剂","铸道安插方向与蜡型长轴一致"],"answer":[1],"explanation":"知识点：蜡型表面缺陷的成因。正确项对：蜡液温度过低时流动性差，反复涂抹会形成层叠皱褶即橘皮样外观。蜡液温度过高自然冷却易出现收缩凹陷而非橘皮；分离剂过多主要影响蜡型与模型的密合度和光滑度；铸道方向与蜡型长轴一致是正常要求，不会导致蜡型表面皱褶。","tier":"进阶"},{"id":53,"type":"single","stem":"在牙科陶瓷烧结过程中，烧结温度超过材料推荐上限时，最可能出现的后果是","options":["瓷体透明度下降并出现气泡","瓷体颜色偏白且强度升高","瓷与金属结合力明显增强","瓷体热膨胀系数显著降低"],"answer":[0],"explanation":"知识点：陶瓷烧结温度对瓷体性能的影响。正确项对：过烧会使瓷体内玻璃相过度流动、产生气泡，并因晶体粗化而降低透明度。颜色偏白且强度升高不符合过烧规律；结合力增强无依据，过烧反而可能破坏界面；热膨胀系数由材料组成决定，不会因过烧显著降低。","tier":"进阶"},{"id":54,"type":"single","stem":"患者戴用可摘局部义齿后主诉咀嚼时义齿翘动，检查发现基托组织面与黏膜之间有明显间隙，正确的处理方法是","options":["调磨基托边缘过长部分","在基托组织面缓冲区加衬","重新取模制作义齿","调磨对颌牙尖以减小侧向力"],"answer":[1],"explanation":"知识点：可摘局部义齿翘动的常见原因与处理。正确项对：基托组织面与黏膜间有间隙会导致受力不均而翘动，加衬可恢复密合。调磨边缘过长解决的是压痛或边缘封闭问题；重新取模制作属于过度处理，应先尝试加衬；调磨对颌牙尖不能解决基托不密合问题，且可能损害天然牙。","tier":"挑战"},{"id":55,"type":"single","stem":"制作烤瓷熔附金属冠时，金属基底冠表面喷砂处理的主要目的是","options":["提高金属表面粗糙度以增强机械锁合","清除金属表面的氧化膜以利于瓷结合","降低金属热膨胀系数以匹配瓷层","增加金属基底冠的厚度以提高强度"],"answer":[1],"explanation":"知识点：金属基底冠表面处理的作用。正确项对：喷砂可清除铸造后金属表面的氧化膜和污染层，使瓷与金属获得良好结合。提高粗糙度主要靠打磨或喷砂后的形貌，但喷砂核心目的在清洁界面；热膨胀系数由合金成分决定；喷砂不会增加基底冠厚度。","tier":"基础"},{"id":56,"type":"single","stem":"全口义齿排牙时，后牙牙合平面应平行于","options":["眶耳平面","鼻翼耳屏线","下颌骨下缘","瞳孔连线"],"answer":[1],"explanation":"知识点：全口义齿牙合平面的参考线。正确项对：鼻翼耳屏线是排列后牙牙合平面的常用参考，可保证牙合平面与下颌运动协调。眶耳平面常用于头影测量，不是排牙直接参考；下颌骨下缘与牙合平面无平行关系；瞳孔连线用于确定前牙切缘和瞳孔平面，不用于后牙牙合平面。","tier":"基础"},{"id":57,"type":"single","stem":"灌注超硬石膏模型时，水粉比控制不当会导致模型强度下降，其关键原因是","options":["水量过多使结晶间孔隙率增大","水量过少使凝固时间明显延长","搅拌时间过长使石膏颗粒破碎","灌注后室温放置使水分蒸发过快"],"answer":[0],"explanation":"知识点：石膏水粉比对模型性能的影响。正确项对：水量过多会使凝固后结晶间孔隙增多，强度和表面硬度下降。水量过少会使凝固加快而非延长；搅拌时间过长主要影响气泡和凝固膨胀；室温放置水分蒸发过快会导致表面粉化，但不是强度下降的关键机制。","tier":"进阶"},{"id":58,"type":"single","stem":"弯制不锈钢丝卡环时，为避免卡环臂在基牙倒凹区产生过大压力，正确的做法是","options":["卡环臂尖端进入倒凹的深度控制为0.25mm左右","卡环臂尖端进入倒凹越深固位越好","卡环臂中部进入倒凹而尖端置于非倒凹区","卡环臂整体离开倒凹区仅靠基托固位"],"answer":[0],"explanation":"知识点：卡环固位臂进入倒凹的深度控制。正确项对：不锈钢丝卡环通常控制尖端进入倒凹约0.25mm，既能提供合适固位力又不损伤基牙。进入倒凹越深会使侧向压力过大；中部进入倒凹而尖端在非倒凹区不符合卡环固位原理；整体离开倒凹区则无固位作用。","tier":"挑战"},{"id":59,"type":"single","stem":"某技师在制作可摘局部义齿时，发现模型上工作侧基牙远中邻面倒凹较大，需进行填倒凹处理，下列做法正确的是","options":["用蜡填塞远中邻面倒凹至观测线以上","保留远中邻面倒凹以增强卡环固位","仅填塞颊侧倒凹，远中邻面不处理","将基牙远中邻面整体磨除"],"answer":[0],"explanation":"知识点：模型填倒凹的操作原则与就位道关系。正确项对：远中邻面倒凹过大影响义齿就位，需用蜡填塞至观测线以上以保证共同就位道。保留远中邻面倒凹会妨碍就位；仅填颊侧不能解决远中邻面问题；磨除基牙远中邻面属于破坏性操作，模型上不可行。","tier":"挑战"},{"id":60,"type":"multi","stem":"关于全口义齿基托蜡型的处理，下列操作符合规范的有","options":["蜡型边缘应比印模边缘短0.5～1.0mm","基托蜡型表面应光滑无锐利边缘","蜡型厚度在后堤区应约2mm","上颌硬区蜡型应适当加厚以增加强度"],"answer":[0,1],"explanation":"知识点：全口义齿基托蜡型的处理要求。正确项对：蜡型边缘应比印模边缘短0.5～1.0mm，便于后续修整和抛光；表面应光滑无锐利边缘，避免刺激黏膜。蜡型后堤区厚度约2mm错误，后堤区应较薄以保证边缘封闭；上颌硬区蜡型加厚错误，硬区应适当缓冲或减薄，避免压迫。","tier":"挑战"},{"id":61,"type":"single","stem":"制作金属烤瓷冠时，金瓷结合界面处金属基底冠的厚度应控制在","options":["0.1～0.2mm","0.3～0.5mm","0.8～1.0mm","1.2～1.5mm"],"answer":[1],"explanation":"知识点为金属烤瓷冠金属基底冠厚度要求。金属基底冠需0.3～0.5mm以保证强度并避免遮色不足；0.1～0.2mm过薄易变形且在烧结中翘曲；0.8～1.0mm过厚会过多磨除牙体组织；1.2～1.5mm过厚影响修复体外形和就位。","tier":"基础"},{"id":62,"type":"single","stem":"全口义齿排牙时，上前牙切缘应位于","options":["切牙乳突中点前方约8～10mm","切牙乳突中点后方约8～10mm","与切牙乳突中点平齐","上颌牙槽嵴顶正上方"],"answer":[0],"explanation":"知识点为全口义齿上前牙排列位置。上前牙切缘应位于切牙乳突中点前方约8～10mm，符合天然牙位置；后方约8～10mm会使上前牙过于靠后；与切牙乳突平齐位置偏后；牙槽嵴顶正上方不符合美学和功能要求。","tier":"基础"},{"id":63,"type":"single","stem":"铸造蜡型在包埋前进行蜡型表面除油处理常用的方法是","options":["用清水冲洗后吹干","用乙醇棉球轻轻擦拭","用肥皂水浸泡后刷洗","用丙酮浸泡溶解表层"],"answer":[1],"explanation":"知识点为蜡型表面处理。乙醇棉球轻擦可去除蜡型表面油脂和指印且不破坏蜡型；清水无法除油；肥皂水浸泡会使蜡型吸水变形；丙酮会溶解蜡型造成损坏。","tier":"基础"},{"id":64,"type":"single","stem":"某技师在制作钴铬合金支架时发现铸件表面出现较多圆形气孔，最可能的原因是","options":["铸型温度过高","合金熔炼温度过低","铸造压力不足","包埋材料透气性过好"],"answer":[2],"explanation":"知识点为铸造缺陷中气孔成因。圆形气孔多因铸造压力不足使气体未排出；铸型温度过高会造成粘砂而非圆形气孔；熔炼温度过低造成浇不足；包埋材料透气性好有利于排气不会造成气孔。","tier":"挑战"},{"id":65,"type":"single","stem":"关于自凝树脂和热凝树脂的性能比较，正确的是","options":["自凝树脂聚合收缩小于热凝树脂","自凝树脂残留单体含量低于热凝树脂","热凝树脂机械强度高于自凝树脂","热凝树脂气泡和孔隙多于自凝树脂"],"answer":[2],"explanation":"知识点为自凝与热凝树脂性能差异。热凝树脂聚合更完全，机械强度高于自凝树脂；自凝树脂聚合收缩大于热凝树脂；自凝树脂残留单体含量高于热凝树脂；热凝树脂在加压加热条件下气泡和孔隙少于自凝树脂。","tier":"基础"},{"id":66,"type":"single","stem":"在焊接义齿支架时，被焊接部件之间应预留的间隙约为","options":["紧密接触无间隙","0.1～0.2mm","0.5～1.0mm","1.5～2.0mm"],"answer":[1],"explanation":"知识点为义齿支架焊接间隙要求。预留0.1～0.2mm间隙有利于焊料流入形成良好连接；紧密接触焊料无法渗入；0.5～1.0mm间隙过大焊料难以充满且影响精度；1.5～2.0mm间隙过大导致焊接强度不足。","tier":"基础"},{"id":67,"type":"single","stem":"某患者全口义齿戴用后主诉下颌义齿在说话时容易脱位，检查发现下颌磨牙区人工牙排列偏舌侧，正确的处理方法是","options":["调磨下颌义齿基托边缘","重新排列下颌磨牙至牙槽嵴顶","加大下颌义齿基托伸展范围","磨除下颌义齿舌侧基托"],"answer":[1],"explanation":"知识点为全口义齿人工牙排列位置与稳定性的关系。磨牙偏舌侧破坏舌侧空间和中性区，导致说话时义齿脱位，应重新排列至牙槽嵴顶；调磨边缘不能解决排列问题；加大基托伸展不能纠正舌侧排列；磨除舌侧基托会降低边缘封闭。","tier":"挑战"},{"id":68,"type":"single","stem":"制作可摘局部义齿时，模型观测线中倒凹深度是指","options":["观测线与牙冠最高点之间的垂直距离","观测线与牙冠最低点之间的水平距离","观测线以下倒凹区牙面到观测线的垂直距离","观测线以上非倒凹区牙面的水平距离"],"answer":[2],"explanation":"知识点为模型观测中倒凹深度的定义。倒凹深度是观测线以下倒凹区牙面到观测线的垂直距离；观测线与牙冠最高点之间的垂直距离是观测线高度概念；水平距离描述不准确；观测线以上非倒凹区与倒凹深度无关。","tier":"基础"},{"id":69,"type":"single","stem":"烤瓷熔附金属修复体在瓷烧结后出现瓷层与金属界面分离，以下最可能的原因是","options":["金属基底冠表面粗糙度不足","瓷粉烧结温度低于要求","金属基底冠表面被油脂污染","瓷层厚度小于1mm"],"answer":[2],"explanation":"知识点为金瓷结合失败原因。金属表面油脂污染会阻碍金瓷结合导致分离；表面粗糙度不足影响结合力但通常不直接导致分离；烧结温度低造成瓷熔合不全而非界面分离；瓷层厚度小于1mm不是界面分离的直接原因。","tier":"进阶"},{"id":70,"type":"single","stem":"在制作全口义齿时，患者下颌牙槽嵴吸收严重呈刃状，排牙时应采取的措施是","options":["将下颌后牙排列在牙槽嵴顶偏颊侧","将下颌后牙排列在牙槽嵴顶偏舌侧","适当减小下颌后牙的颊舌径","增大下颌后牙的覆盖面积"],"answer":[2],"explanation":"知识点为牙槽嵴吸收严重时全口义齿排牙原则。刃状牙槽嵴承受力差，应减小后牙颊舌径以减小力；排牙偏颊侧或偏舌侧都会破坏中性区导致不稳定；增大覆盖面积会增加力加重牙槽嵴吸收。","tier":"进阶"},{"id":71,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要预留的金属收缩补偿量主要取决于","options":["合金的线收缩率","蜡型的厚度","包埋材料的膨胀量","铸圈的透气性"],"answer":[2],"explanation":"知识点：铸造收缩补偿原理。正确项：铸造收缩主要靠包埋材料凝固膨胀和加热膨胀补偿，故取决于包埋材料的膨胀量。错误项：合金线收缩率是固定材料属性，不是可预留的补偿量；蜡型厚度影响铸件壁厚而非补偿；铸圈透气性影响排气，不决定收缩补偿。","tier":"进阶"},{"id":72,"type":"single","stem":"可摘局部义齿基托蜡型完成后，装盒时首选的处理方式是","options":["直接加压注入石膏","先涂分离剂再灌注石膏","先冷冻蜡型再灌注石膏","先浸湿蜡型再灌注石膏"],"answer":[1],"explanation":"知识点：装盒前蜡型处理。正确项：蜡型与石膏之间需涂分离剂，便于蜡型去除和石膏分离。错误项：直接灌石膏会使蜡与石膏粘连；冷冻蜡型会导致蜡脆裂变形；浸湿蜡型会使表面蜡质变软、影响石膏复制精度。","tier":"挑战"},{"id":73,"type":"single","stem":"全口义齿排牙时，上前牙切缘应位于切牙乳突前缘的","options":["唇侧约2mm","唇侧约5mm","后方约2mm","后方约5mm"],"answer":[2],"explanation":"知识点：全口义齿前牙排列位置。正确项：上中切牙切缘一般位于切牙乳突前缘后方约2mm处，符合美学和功能要求。错误项：唇侧2mm和5mm均过于靠前；后方5mm过于靠后，均不符合常规排牙标准。","tier":"基础"},{"id":74,"type":"single","stem":"磷酸盐包埋材料调拌时，若用水量多于规定量，铸件最可能出现","options":["铸件表面粗糙","铸件尺寸偏大","铸件尺寸偏小","铸件边缘锐利"],"answer":[2],"explanation":"知识点：包埋材料水粉比与膨胀关系。正确项：水量增多会使包埋材料膨胀量减少，补偿不足，铸件相对偏小。错误项：表面粗糙多与包埋材料粒度或调拌气泡有关；尺寸偏大是膨胀过度所致；边缘锐利与铸造完整性和打磨有关。","tier":"基础"},{"id":75,"type":"single","stem":"患者全口义齿戴用1周后主诉下颌义齿在大张口时易脱位，检查发现基托边缘在下颌磨牙后垫区伸展过长，正确的处理是","options":["磨短磨牙后垫区过长基托边缘","加高下颌义齿后牙牙尖","重衬下颌义齿组织面","调磨下颌义齿颊侧基托"],"answer":[0],"explanation":"知识点：全口义齿基托边缘伸展异常的处理。正确项：大张口时磨牙后垫区过长边缘会受牵拉导致脱位，应磨短该区过长边缘。错误项：加高后牙牙尖与脱位无关；重衬不能解决边缘过长；调磨颊侧基托不针对磨牙后垫区问题。","tier":"挑战"},{"id":76,"type":"single","stem":"固定桥金属烤瓷修复体中，金属基底冠的厚度通常要求达到","options":["0.1～0.2mm","0.3～0.5mm","0.6～0.8mm","1.0～1.2mm"],"answer":[1],"explanation":"知识点：金属烤瓷基底冠厚度要求。正确项：金属基底冠一般需0.3～0.5mm，兼顾强度和遮色。错误项：0.1～0.2mm过薄易变形；0.6～0.8mm和1.0～1.2mm过厚会过多磨除牙体组织并影响瓷层空间。","tier":"基础"},{"id":77,"type":"single","stem":"用石膏模型制作工作模时，为获得较高强度和较低膨胀，应选用的石膏是","options":["普通熟石膏","硬石膏","超硬石膏","模型石膏"],"answer":[2],"explanation":"知识点：不同石膏类型性能。正确项：超硬石膏强度最高、膨胀较小，适合工作模。错误项：普通熟石膏强度低；硬石膏强度和膨胀介于普通与超硬之间；模型石膏强度低、膨胀大，均不理想。","tier":"进阶"},{"id":78,"type":"single","stem":"可摘局部义齿铸造卡环中，圆环形卡环的卡臂尖应位于基牙的","options":["倒凹区","非倒凹区","外形高点","颈缘处"],"answer":[0],"explanation":"知识点：卡环卡臂尖位置。正确项：卡臂尖应进入基牙倒凹区，发挥固位作用。错误项：非倒凹区无固位力；外形高点处无法进入倒凹；颈缘处易刺激牙龈且固位不当。","tier":"基础"},{"id":79,"type":"single","stem":"制作嵌体蜡型时，为补偿铸造收缩，蜡型应","options":["比窝洞略小","与窝洞完全一致","比窝洞略大","比窝洞深1mm"],"answer":[2],"explanation":"知识点：嵌体蜡型补偿。正确项：蜡型需适当放大以补偿铸造收缩，故应比窝洞略大。错误项：略小或完全一致均会因收缩导致铸件过小；比窝洞深1mm会超出洞底，不符合要求。","tier":"基础"},{"id":80,"type":"single","stem":"在制作钴铬合金铸造支架时，熔模的铸道口应设置在支架蜡型的哪个部位更有利于金属液充填？","options":["网状结构边缘的网孔处","连接体最厚大的区域","卡环臂最细的尖端处","支托凹的中央位置"],"answer":[1],"explanation":"知识点：铸造支架铸道设置原则。铸道口应设在蜡型最厚大、金属液最后凝固的部位（连接体区域），以利于补缩和充填。网状边缘网孔处易造成充填不足；卡环臂尖端过细，先凝固堵塞通道；支托凹中央会破坏支托形态。","tier":"进阶"},{"id":81,"type":"single","stem":"烤瓷熔附金属冠桥的金属基底冠在堆塑瓷粉前进行喷砂处理的目的是什么？","options":["增加金属表面粗糙度以提高机械嵌合","消除金属表面的残余应力","提高金属基底冠的耐腐蚀性","降低金属与瓷的热膨胀系数差异"],"answer":[0],"explanation":"知识点：金瓷结合机制。喷砂可清洁金属表面并形成粗糙面，增大与瓷的机械嵌合力。消除残余应力靠退火处理；耐腐蚀性由合金成分决定；热膨胀系数差异由材料匹配决定，喷砂不改变。","tier":"基础"},{"id":82,"type":"single","stem":"可摘局部义齿基托蜡型在模型上完成后，装盒前进行蜡型表面光滑处理的正确操作是什么？","options":["用酒精喷灯火焰快速掠过蜡型表面","用湿棉球蘸肥皂水擦洗蜡型","用蜡刀加热后刮平蜡型边缘","用冷水浸泡蜡型使其硬化"],"answer":[0],"explanation":"知识点：蜡型表面处理。用酒精喷灯火焰快速掠过可使蜡型表面光滑，避免石膏包埋时产生气泡。肥皂水擦洗会残留水分和皂液；热蜡刀刮平仅处理边缘且可能变形；冷水浸泡使蜡变脆易裂且不解决表面光洁度。","tier":"基础"},{"id":83,"type":"single","stem":"在制作树脂基托时，热处理后开盒发现基托组织面出现许多小气泡，最可能的原因是？","options":["充填树脂时压力不足","热处理升温速度过快","石膏模型表面涂布分离剂过多","树脂粉液比中液体偏多"],"answer":[1],"explanation":"知识点：树脂基托气泡成因。热处理升温过快使树脂内部单体沸腾产生气泡，多分布于组织面。充填压力不足导致的是大缺陷或边缘缺损；分离剂过多影响的是基托与石膏分离；液体偏多导致收缩增大而非气泡。","tier":"挑战"},{"id":84,"type":"single","stem":"在制作套筒冠内冠时，内冠轴面聚合度的设计通常应控制在什么范围？","options":["2°~4°","6°~8°","10°~12°","15°~20°"],"answer":[1],"explanation":"知识点：套筒冠内冠设计。内冠轴面聚合度一般为6°~8°，既能保证就位又不失固位力。2°~4°过小导致就位困难且摩擦力过大；10°~12°和15°~20°过大则固位力不足。","tier":"进阶"},{"id":85,"type":"single","stem":"某技师在制作铸造桩核蜡型时，桩的部分长度不足根长的1/2，最可能导致什么后果？","options":["桩核就位困难","桩核固位力不足","根管侧穿风险增加","桩核蜡型变形"],"answer":[1],"explanation":"知识点：铸造桩核桩长要求。桩长应达根长的2/3以上以保证固位，不足1/2时固位力明显不足。就位困难与桩的锥度相关；根管侧穿与预备方向相关；蜡型变形与操作温度相关。","tier":"进阶"},{"id":86,"type":"single","stem":"全口义齿人工后牙排列时，第二磨牙远中面应位于何处？","options":["磨牙后垫前缘","磨牙后垫后缘","磨牙后垫中份","磨牙后垫前1/3处"],"answer":[1],"explanation":"知识点：全口义齿后牙排列位置。第二磨牙远中面应与磨牙后垫后缘平齐，以保证足够的咀嚼面积和基托支持。排在前缘或中份则后牙区面积不足，影响咀嚼效率。","tier":"基础"},{"id":87,"type":"single","stem":"在制作烤瓷冠时，体瓷堆塑完成后进行回切（cut-back）的主要目的是什么？","options":["为切端瓷和透明瓷预留空间","消除瓷层内部的气泡","补偿瓷粉烧结时的收缩","增加体瓷与金属的结合强度"],"answer":[0],"explanation":"知识点：烤瓷冠瓷层构筑。回切是在体瓷堆塑后磨除部分瓷体，为切端瓷和透明瓷预留空间以模拟天然牙的层次感。消除气泡靠振动和真空烧结；补偿收缩靠加瓷补偿；金瓷结合靠金属基底处理。","tier":"基础"},{"id":88,"type":"multi","stem":"关于可摘局部义齿铸造牙合支托的设计要求，下列哪些描述是正确的？","options":["支托应位于基牙牙合面近远中边缘嵴处","支托宽度应为基牙颊舌径的1/3~1/2","支托厚度应不小于1.0mm","支托应呈匙形且与基牙牙合面呈面接触","支托可放置在基牙颊面倒凹区以增强固位"],"answer":[0,1,2],"explanation":"知识点：铸造牙合支托设计规范。支托位于牙合面近远中边缘嵴处，宽度为颊舌径1/3~1/2，厚度不小于1.0mm，均正确。支托应呈匙形但为线接触而非面接触，故第四项错误；支托不能放在颊面倒凹区，那是卡环的位置，故第五项错误。","tier":"挑战"},{"id":89,"type":"single","stem":"制作钴铬合金铸造支架时，模型上设计舌杆的横截面形态通常应为","options":["半梨形，上缘薄下缘厚","半圆形，上下等厚","扁平矩形，边缘锐利","倒梯形，下缘薄上缘厚"],"answer":[0],"explanation":"知识点：可摘局部义齿大连接体舌杆的形态设计。舌杆横截面呈半梨形，上缘薄（约1.5mm）下缘厚（约2mm），可贴合舌侧组织并利于自洁；半圆形等厚不利于与黏膜贴合且刚度分布不佳；扁平矩形边缘锐利会刺激舌体；倒梯形下缘薄会削弱抗弯强度且压迫口底。","tier":"基础"},{"id":90,"type":"single","stem":"在烤瓷熔附金属修复体中，金属基底冠表面进行喷砂处理的主要目的是","options":["增加金属表面粗糙度以提高金瓷结合强度","清除金属表面的氧化膜以提高润湿性","降低金属热膨胀系数以匹配瓷层","增加金属表面光泽以利于瓷层流平"],"answer":[0],"explanation":"知识点：金瓷结合机制中的机械结合。喷砂使金属表面形成均匀粗糙面，增大与瓷的机械锁结面积从而提高结合强度；清除氧化膜主要靠预氧化前的酸洗或超声清洗，喷砂不能替代；喷砂不改变合金热膨胀系数；喷砂使表面粗糙而非增加光泽。","tier":"进阶"},{"id":91,"type":"single","stem":"全口义齿排牙时，上颌后牙牙长轴的倾斜方向通常为","options":["向近中及颊侧倾斜","向远中及舌侧倾斜","向近中及舌侧倾斜","向远中及颊侧倾斜"],"answer":[0],"explanation":"知识点：全口义齿人工后牙排列的补偿曲线与横𬌗曲线要求。上颌后牙需向近中及颊侧倾斜，形成纵𬌗曲线与横𬌗曲线，以利于前伸及侧方𬌗平衡；向远中倾斜会破坏补偿曲线；向舌侧倾斜会形成反横𬌗曲线；向远中颊侧倾斜不符合后牙排列力学要求。","tier":"基础"},{"id":92,"type":"single","stem":"患者全口义齿戴用一周后诉下颌牙槽嵴舌侧前部压痛，检查见基托边缘过长压迫口底，正确的处理方法是","options":["磨除下颌基托舌侧过长边缘并抛光","调磨下颌前牙人工牙舌面","加高下颌前牙区基托厚度","重衬下颌义齿组织面"],"answer":[0],"explanation":"知识点：全口义齿压痛的原因分析与处理。基托边缘过长压迫口底黏膜导致压痛，应磨除过长边缘并抛光；调磨人工牙舌面只能改变舌侧外形，不能解除边缘压迫；加高基托厚度会加重压迫；重衬适用于基托不密合而非边缘过长。","tier":"进阶"},{"id":93,"type":"single","stem":"制作可摘局部义齿时，前腭杆的宽度和厚度通常设计为","options":["宽8mm、厚1.8mm","宽3mm、厚1.0mm","宽5mm、厚2.5mm","宽10mm、厚0.8mm"],"answer":[0],"explanation":"知识点：可摘局部义齿前腭杆的尺寸设计。前腭杆位于腭皱襞后方，需有足够宽度分散𬌗力，通常宽约8mm、厚约1.8mm；宽3mm过窄易变形；宽5mm厚2.5mm过厚会妨碍舌运动；宽10mm厚0.8mm过薄易变形且覆盖过多腭部组织。","tier":"基础"},{"id":94,"type":"single","stem":"在牙科CAD/CAM加工氧化锆全冠时，烧结后的氧化锆修复体表面处理通常采用","options":["喷砂后用专用染色液着色再上釉","氢氟酸酸蚀后硅烷化处理","磷酸酸蚀后涂布粘接剂","打磨后直接抛光不使用染色液"],"answer":[0],"explanation":"知识点：氧化锆修复体的表面处理与着色工艺。氧化锆烧结后常用氧化铝喷砂清洁表面，再用专用染色液调整颜色后上釉；氢氟酸酸蚀适用于玻璃陶瓷而非氧化锆；磷酸酸蚀用于牙体粘接前处理；直接抛光不适用于需要颜色匹配的修复体。","tier":"进阶"},{"id":95,"type":"single","stem":"铸造全冠蜡型制作时，为补偿合金冷却收缩，蜡型应","options":["在轴面适当加厚蜡型以补偿收缩","在边缘处减薄蜡型以利于就位","在𬌗面均匀减薄0.2mm","在邻面不做任何补偿处理"],"answer":[0],"explanation":"知识点：铸造收缩补偿原理。合金冷却收缩会使铸件尺寸变小，蜡型需在轴面适当加厚以补偿收缩；边缘减薄会导致铸件边缘过薄不密合；𬌗面减薄会使𬌗面穿孔或强度不足；邻面不补偿会造成邻接过紧无法就位。","tier":"基础"},{"id":96,"type":"single","stem":"患者下颌肯氏II类缺失，设计可摘局部义齿时，为防止义齿翘动，应在游离缺失侧采取的措施是","options":["设计间接固位体并延伸基托覆盖磨牙后垫","仅用卡环固位不延伸基托","减少游离端基托面积以减轻负荷","将𬌗支托放置在前磨牙远中边缘嵴"],"answer":[0],"explanation":"知识点：肯氏II类缺损的义齿设计原则。游离缺失侧需设计间接固位体并延伸基托覆盖磨牙后垫以对抗翘动；仅用卡环不能防止游离端下沉翘动；减少基托面积会增大单位面积压力；𬌗支托放在前磨牙远中边缘嵴不能有效对抗游离端翘动。","tier":"进阶"},{"id":97,"type":"single","stem":"在制作金属烤瓷冠时，预氧化处理的目的是","options":["使金属表面形成致密氧化膜以利于瓷层结合","去除金属表面所有氧化物以暴露金属","提高金属表面粗糙度以增强机械锁结","降低金属表面张力以利于瓷层流动"],"answer":[0],"explanation":"知识点：金瓷结合中的化学结合机制。预氧化使金属表面形成适量致密氧化膜，与瓷中的氧化物形成化学键结合；完全去除氧化膜会丧失化学结合；提高粗糙度是喷砂的作用；降低表面张力不是预氧化的目的。","tier":"基础"},{"id":98,"type":"single","stem":"全口义齿试戴时发现下颌义齿在正中𬌗时前牙区有早接触，正确的调磨方法是","options":["调磨下颌前牙切缘的早接触点","调磨上颌前牙腭侧早接触点","同时调磨上下前牙直至无接触","加高下颌前牙区基托以消除间隙"],"answer":[0],"explanation":"知识点：全口义齿𬌗调磨原则。前牙早接触时应调磨下颌前牙切缘，因下颌义齿基托面积较小且易翘动，调磨上颌前牙腭侧会破坏美观和功能；同时调磨上下前牙会丧失前牙接触；加高基托不能消除早接触。","tier":"挑战"},{"id":99,"type":"single","stem":"制作可摘局部义齿时，模型观测中确定义齿就位道的原则是","options":["选择使各基牙倒凹深度分布均匀的就位道","选择使所有基牙倒凹深度最大的就位道","选择使义齿固位力最小的就位道","选择使基托覆盖面积最小的就位道"],"answer":[0],"explanation":"知识点：模型观测与就位道选择。就位道应使各基牙倒凹深度分布均匀，便于卡环设计和义齿就位；倒凹最大会导致就位困难；固位力最小不利于固位；基托面积最小不一定是就位道选择的首要原则。","tier":"进阶"},{"id":100,"type":"multi","stem":"制作钴铬合金铸造支架时，模型上设计为前牙区邻面板与舌杆连接，关于该连接处蜡型制作的操作要点，下列叙述正确的有","options":["邻面板与舌杆连接处应形成适当厚度的圆弧过渡，避免直角相接","连接处蜡型应稍加宽并平滑移行，以利合金铸造时金属液流动","邻面板龈向边缘应伸入倒凹区以增强固位，舌杆连接处可保留锐角","连接处蜡型厚度应略小于舌杆厚度，以减轻支架重量"],"answer":[0,1],"explanation":"知识点：可摘局部义齿钴铬合金铸造支架蜡型制作中连接体处的形态要求。正确项1：连接处圆弧过渡可避免应力集中和铸造缺陷，符合合金收缩与力学要求；正确项2：连接处适当加宽、平滑移行有利于金属液充盈，减少缩孔。错误项1：邻面板龈向边缘伸入倒凹区会妨碍就位，且舌杆连接处保留锐角易造成应力集中和铸造不全；错误项2：连接处厚度小于舌杆会形成薄弱区，铸造时易断裂，不符合支架强度要求。","tier":"挑战"},{"id":101,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要为支架的固位臂预留的倒凹深度通常控制在","options":["0.25mm左右","0.75mm左右","1.50mm左右","2.00mm左右"],"answer":[0],"explanation":"知识点为可摘局部义齿铸造支架固位臂的倒凹深度设计。钴铬合金弹性模量高，固位臂进入倒凹深度一般约0.25mm即可获得足够固位力且便于就位；0.75mm和1.50mm进入倒凹过深，就位困难且易导致基牙损伤；2.00mm远超常规，会造成支架无法就位或基牙受力过大。","tier":"进阶"},{"id":102,"type":"single","stem":"用琼脂印模材料制取工作模时，灌注超硬石膏的最佳时机是","options":["印模冷却至室温后立即灌注","印模表面水分自然晾干后灌注","印模在室温放置30分钟后再灌注","印模用冷水浸泡10分钟后灌注"],"answer":[0],"explanation":"知识点为琼脂印模材料的灌注时机。琼脂为可逆性水胶体，冷却至室温后凝胶已稳定，应立即灌注石膏以免失水变形；晾干会使印模表面脱水收缩，导致模型失真；放置30分钟会因脱水或吸水引起尺寸变化；冷水浸泡会使琼脂吸水膨胀，同样影响精度。","tier":"基础"},{"id":103,"type":"single","stem":"在烤瓷熔附金属修复体中，金瓷结合界面处金属表面预氧化的主要作用是","options":["增加金属表面粗糙度以增强机械嵌合","形成致密氧化膜以利于化学结合","清除金属表面残留的铸造缺陷","降低金属热膨胀系数以匹配瓷层"],"answer":[1],"explanation":"知识点为金瓷结合的化学结合机制。预氧化使金属表面形成一层薄而致密的氧化物，与瓷中的氧化物成分发生化学键合，是金瓷结合的主要力量；增加粗糙度属于机械结合，不是预氧化的主要目的；清除铸造缺陷靠喷砂和打磨；金属热膨胀系数由合金成分决定，预氧化不能改变。","tier":"基础"},{"id":104,"type":"single","stem":"某技师在制作全口义齿时发现下唇系带处的基托边缘过长，正确的处理方式是","options":["将基托边缘磨短并形成圆钝斜面","将基托边缘磨薄但保留原有长度","在基托边缘加蜡后重新热处理","将基托边缘磨短并形成锐利边缘"],"answer":[0],"explanation":"知识点为全口义齿基托边缘的缓冲与形态要求。系带处基托边缘过长会妨碍系带活动，应磨短并形成圆钝斜面，既避让系带又保证封闭；仅磨薄不缩短仍会妨碍系带活动；加蜡热处理不能解决边缘过长问题；锐利边缘会刺激黏膜。","tier":"挑战"},{"id":105,"type":"single","stem":"制作可摘局部义齿时，模型观测线将基牙倒凹区划分为不同区域，其中位于观测线龈方、靠近缺隙侧的倒凹称为","options":["一型观测线倒凹","二型观测线倒凹","三型观测线倒凹","四型观测线倒凹"],"answer":[1],"explanation":"知识点为观测线的分型及其倒凹分布。二型观测线为基牙向缺隙方向倾斜时画出，其倒凹主要位于观测线龈方靠近缺隙侧，适合放置I型卡环；一型观测线倒凹位于观测线龈方远离缺隙侧；三型观测线倒凹较浅而分散；四型观测线无倒凹或倒凹极浅。","tier":"进阶"},{"id":106,"type":"single","stem":"焊接钴铬合金支架时，为减少焊接变形，正确的操作是","options":["采用火焰焊并快速加热焊接区","采用点焊固定后分段对称焊接","将焊件整体预热至800℃后一次焊完","在焊接区加大量焊媒后连续焊接"],"answer":[1],"explanation":"知识点为支架焊接的变形控制。点焊固定后分段对称焊接可使热量分布均匀，减小焊接应力与变形；火焰焊加热不均易变形；整体预热至800℃会使薄件软化变形；加大量焊媒并连续焊接会因热集中而加剧变形。","tier":"基础"},{"id":107,"type":"single","stem":"在制作全口义齿时，下列关于后堤区处理的描述正确的是","options":["后堤区应位于腭小凹前方2mm处","后堤区应位于腭小凹后方并延伸至腭腱膜","后堤区应位于硬腭中部以增强吸附力","后堤区应位于软腭活动区以形成边缘封闭"],"answer":[1],"explanation":"知识点为全口义齿上颌后堤区的位置与功能。后堤区位于腭小凹后方、软腭与硬腭交界处，延伸至腭腱膜，通过轻微压迫形成后缘封闭；腭小凹前方为硬腭区，不能形成有效封闭；硬腭中部无弹性，无法压入形成封闭；软腭活动区会随吞咽活动移动，不能作为封闭区。","tier":"进阶"},{"id":108,"type":"single","stem":"制作铸造全冠蜡型时，为保证蜡型从代型上取下时不撕裂，常用的方法是","options":["在代型表面涂布藻酸盐分离剂","在代型表面涂布蜡型分离剂并冷却蜡型","在代型表面涂布石膏硬化剂","在代型表面涂布硅油后立即取下蜡型"],"answer":[1],"explanation":"知识点为铸造全冠蜡型的分离处理。涂布专用蜡型分离剂并待蜡型充分冷却硬化后再取下，可避免蜡型变形撕裂；藻酸盐分离剂主要用于石膏与石膏之间；石膏硬化剂用于提高石膏强度，无分离作用；硅油虽可分离但立即取下蜡型尚未硬化，易变形。","tier":"进阶"},{"id":109,"type":"single","stem":"某患者戴用可摘局部义齿后主诉咀嚼时义齿翘动，检查发现义齿基托与黏膜贴合良好，但远中基牙卡环固位臂未进入倒凹。技师在模型上重新制作卡环时，正确的做法是","options":["加深该基牙倒凹后重新弯制卡环","在观测仪上重新确定就位道并调整卡环位置","将该卡环改为无固位作用的间隙卡","减小基托伸展范围以消除翘动"],"answer":[1],"explanation":"知识点为可摘局部义齿卡环固位不良的临床处理。卡环固位臂未进入倒凹说明就位道设计或卡环位置不当，应在观测仪上重新确定就位道并调整卡环，使固位臂进入合适倒凹；加深倒凹会损伤基牙且可能改变就位道；改为无固位卡环不能解决翘动；减小基托范围会降低支持与稳定。","tier":"挑战"},{"id":110,"type":"single","stem":"制作烤瓷熔附金属全冠时，金属基底冠的瓷层厚度一般应控制在","options":["0.3～0.5mm","0.8～1.0mm","1.2～1.5mm","1.8～2.0mm"],"answer":[1],"explanation":"知识点为金瓷全冠的瓷层厚度要求。瓷层厚度一般控制在0.8～1.0mm，既能保证颜色和强度，又便于金属基底冠预留足够空间；0.3～0.5mm过薄，遮色和强度不足；1.2～1.5mm和1.8～2.0mm过厚，会过度磨除牙体或影响就位。","tier":"基础"},{"id":111,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要先填补的倒凹区通常位于基牙的","options":["颊侧轴面倒凹区","舌侧轴面倒凹区","近缺隙侧邻面倒凹区","远缺隙侧邻面倒凹区"],"answer":[2],"explanation":"知识点为可摘局部义齿铸造支架的模型准备。近缺隙侧邻面倒凹区需要填补消除，以便义齿就位。颊侧和舌侧轴面倒凹区通常保留或按设计处理，不是常规首要填补区；远缺隙侧邻面倒凹区一般也不是填补重点。","tier":"进阶"},{"id":112,"type":"single","stem":"使用寒天印模材制取印模时，调拌后灌注模型的最佳时机是","options":["调拌后立即灌注","凝胶完全冷却后灌注","凝胶开始凝固时灌注","凝胶表面失去光泽后灌注"],"answer":[1],"explanation":"知识点为寒天印模材的水胶体特性。寒天印模材需在凝胶完全冷却、恢复弹性后灌注模型，否则易变形。调拌后立即灌注会因温度高而损伤模型；开始凝固时仍不稳定；表面失去光泽只是凝固开始的标志，不代表冷却到位。","tier":"基础"},{"id":113,"type":"single","stem":"隐形义齿（弹性树脂义齿）的基托边缘通常设计为","options":["覆盖基牙倒凹区以增强固位","避开基牙倒凹区以利就位","止于基牙外形高点处","延伸至黏膜转折处"],"answer":[0],"explanation":"知识点为弹性树脂义齿的固位原理。弹性树脂具有弹性，可进入基牙倒凹区获得固位。避开倒凹则无法利用弹性卡抱；止于外形高点处不能获得足够固位；延伸至黏膜转折处是普通基托要求，不是弹性义齿边缘设计核心。","tier":"基础"},{"id":114,"type":"single","stem":"焊接钴铬合金支架时，为防止焊接区氧化，常用的助焊措施是","options":["使用硼砂作为焊媒","使用磷酸锌水门汀包埋","使用石膏包埋固定","使用酒精灯预热"],"answer":[0],"explanation":"知识点为口腔修复焊接中的焊媒作用。硼砂是常用焊媒，可清除氧化物并防止焊接区氧化。磷酸锌水门汀和石膏用于包埋固定而非助焊；酒精灯预热不能防止氧化。","tier":"基础"},{"id":115,"type":"single","stem":"患者戴用可摘局部义齿后出现基牙疼痛，检查发现卡环臂进入基牙倒凹过深，最可能的直接原因是","options":["卡环臂过松","卡环臂过紧","支托未贴合","基托边缘过长"],"answer":[1],"explanation":"知识点为卡环设计与基牙疼痛的关系。卡环臂进入倒凹过深会卡抱过紧，导致基牙受力过大而疼痛。卡环过松不会引起疼痛；支托未贴合主要影响支持；基托边缘过长主要引起黏膜压痛。","tier":"挑战"},{"id":116,"type":"single","stem":"在制作全口义齿时，选择人工后牙牙尖斜度主要依据","options":["患者的面部外形","患者的咀嚼习惯","患者的牙槽嵴吸收程度","患者的发音需求"],"answer":[2],"explanation":"知识点为全口义齿人工牙选择原则。牙槽嵴吸收严重者应选用牙尖斜度较小的人工牙，以减少侧向力。面部外形主要影响前牙选择；咀嚼习惯和发音需求不是选择后牙牙尖斜度的主要依据。","tier":"基础"},{"id":117,"type":"single","stem":"使用硅橡胶印模材制取精细印模时，若催化剂与基质比例不当，最可能造成的结果是","options":["印模材凝固过快或过慢","印模材颜色改变","印模材与托盘分离","印模材表面出现气泡"],"answer":[0],"explanation":"知识点为硅橡胶印模材的调配比例。催化剂与基质比例直接影响凝固时间，比例不当会导致凝固过快或过慢。颜色改变不是主要结果；与托盘分离多因粘接不良；表面气泡多因操作带入空气。","tier":"进阶"},{"id":118,"type":"single","stem":"制作可摘局部义齿时，模型观测线的主要作用是","options":["确定基牙倒凹深度","确定义齿就位道","确定基托伸展范围","确定咬合高度"],"answer":[1],"explanation":"知识点为模型观测线的意义。观测线用于确定义齿的共同就位道，指导卡环设计和倒凹填补。倒凹深度需结合观测仪测量；基托伸展范围和咬合高度不是观测线的主要作用。","tier":"基础"},{"id":119,"type":"single","stem":"患者全口义齿修复后，说话时出现哨音，最可能的原因是","options":["基托后缘过短","腭侧基托前部过厚","人工牙排列过于偏舌侧","下颌牙槽嵴吸收过多"],"answer":[2],"explanation":"知识点为全口义齿发音问题的原因。人工牙排列过于偏舌侧会缩小舌活动空间，导致哨音。基托后缘过短主要影响固位；腭侧基托前部过厚可能影响发音但哨音更与舌侧空间相关；下颌牙槽嵴吸收过多影响固位和稳定。","tier":"基础"},{"id":120,"type":"single","stem":"制作钴铬合金铸造支架时，模型上填倒凹使用的材料应具备的最主要性能是","options":["可精确复制蜡型表面纹理","能牢固粘接于石膏模型表面","具有足够硬度和耐蜡液温度","可在水中自行溶解便于清理"],"answer":[2],"explanation":"知识点：填倒凹材料性能要求。正确项：填倒凹后需承受蜡液温度并保持形状，故需足够硬度和耐热性。错误项：复制表面纹理是印模材要求；牢固粘接并非主要指标且需便于取下；自行溶解会造成填倒凹区不稳定。","tier":"进阶"},{"id":121,"type":"single","stem":"可摘局部义齿支架蜡型中，连接体与卡环臂交接处出现尖锐内角，最可能造成的后果是","options":["义齿就位时卡环臂弹性增大","铸造时该处产生热裂或缩孔","基牙受力时卡环臂更易贴合","打磨时该处更易获得光滑面"],"answer":[1],"explanation":"知识点：蜡型转角对铸造缺陷的影响。正确项：尖锐内角造成应力集中和凝固收缩受阻，易产生热裂或缩孔。错误项：弹性由材料与尺寸决定；尖锐角不利于贴合；尖锐角打磨时反而易形成台阶而非光滑面。","tier":"进阶"},{"id":122,"type":"single","stem":"患者因上颌全口义齿基托边缘过长导致压痛，技师在模型上调整基托边缘时正确的处理方式是","options":["用蜡刀将过长边缘整体削除","在压痛区基托边缘磨除并抛光","用自凝树脂加厚压痛区边缘","将基托边缘均匀加热后拉伸"],"answer":[1],"explanation":"知识点：全口义齿基托边缘过长的椅旁/技工处理。正确项：边缘过长应针对性磨除过长部分并抛光。错误项：整体削除会破坏边缘封闭；加厚会加重压迫；加热拉伸会使基托变形。","tier":"进阶"},{"id":123,"type":"single","stem":"制作金属烤瓷冠时，金瓷结合面在烤瓷前进行喷砂处理的主要目的是","options":["增加金属表面粗糙度以提高机械锁结","去除金属表面氧化膜并活化表面","使金属表面形成均匀的氧化层","降低金属热膨胀系数以匹配瓷层"],"answer":[0],"explanation":"知识点：金瓷结合机制。正确项：喷砂增加表面积和粗糙度，增强机械锁结。错误项：去氧化膜主要靠酸洗或预氧化前处理；喷砂不形成均匀氧化层；喷砂不改变热膨胀系数。","tier":"进阶"},{"id":124,"type":"single","stem":"患者戴用全口义齿后主诉说话时义齿易脱落，检查发现基托磨光面呈凸形，正确的技工修改方向是","options":["加厚基托边缘以增加吸附力","将磨光面改为凹形以利肌肉挟持","降低基托高度减少气流干扰","磨除舌侧边缘消除异物感"],"answer":[1],"explanation":"知识点：全口义齿磨光面形态与固位。正确项：磨光面应呈凹形，使颊舌肌力量协助固位。错误项：加厚边缘破坏边缘封闭；降低基托高度影响封闭；磨除舌侧边缘丧失封闭。","tier":"挑战"},{"id":125,"type":"single","stem":"固定桥金属基底冠蜡型回切时，为预留瓷层空间，切端回切量一般应为","options":["0.2~0.3mm","0.5~0.8mm","1.0~1.2mm","1.5~2.0mm"],"answer":[3],"explanation":"知识点：金瓷冠瓷层厚度要求。正确项：切端瓷层通常需1.5~2.0mm以保证色泽和强度。错误项：0.2~0.3mm过薄遮色不足；0.5~0.8mm为唇面颈部区参考；1.0~1.2mm仍不足以满足切端美学层次。","tier":"基础"},{"id":126,"type":"single","stem":"灌注工作模型时，为防止石膏模型出现气泡，正确的操作是","options":["将石膏从模型一侧缓慢注入","将石膏从模型最高处快速注入","调拌石膏时增加水量提高流动性","灌注后立即用真空调理去除气泡"],"answer":[0],"explanation":"知识点：模型灌注操作。正确项：从一侧缓慢注入使石膏逐渐上升推出空气。错误项：从最高处快速注入易包裹空气；加水量过多降低强度；灌注后真空处理无法去除已包裹气泡。","tier":"基础"},{"id":127,"type":"single","stem":"可摘局部义齿铸造完成后，卡环臂与基牙之间出现间隙，最可能的工艺原因是","options":["模型填倒凹过度","蜡型卡环臂过粗","铸造时金属收缩过大","支架打磨时过度抛光"],"answer":[0],"explanation":"知识点：填倒凹与卡环贴合。正确项：填倒凹过度会使卡环臂在就位后与基牙之间产生间隙。错误项：卡环臂过粗影响弹性但不直接形成间隙；铸造收缩可通过铸造补偿控制；打磨抛光不改变卡环位置。","tier":"进阶"},{"id":128,"type":"single","stem":"患者铸造支架可摘局部义齿试戴时发现固位力过强难以摘戴，技师在模型上正确的调整方法是","options":["磨改卡环臂尖端使其变短","磨薄卡环臂中段增加弹性","调磨卡环臂进入倒凹的深度","加热卡环臂后向外扳动"],"answer":[2],"explanation":"知识点：卡环固位力调整。正确项：固位力取决于卡环臂进入倒凹深度，调磨该深度可减小固位力。错误项：磨短卡环臂尖端改变固位位置；磨薄中段易导致断裂；加热扳动会使金属性能改变且不可控。","tier":"挑战"},{"id":129,"type":"single","stem":"患者全口义齿戴用后出现下颌后退、咬合偏斜，检查发现双侧髁突位置不对称，技师在重新排牙时正确的处理是","options":["按原有颌位记录重新上颌架","用蜡堤重新确定水平颌位关系","仅调整下颌前牙排列位置","将下颌模型向前移动固定"],"answer":[1],"explanation":"知识点：颌位关系记录。正确项：颌位关系错误需重新用蜡堤确定水平颌位关系后再上颌架。错误项：按原记录上架会重复错误；仅调前牙不解决整体关系；模型前移无依据。","tier":"挑战"},{"id":130,"type":"multi","stem":"关于可摘局部义齿铸造支架蜡型制作，下列做法正确的有","options":["卡环臂蜡型应沿基牙外形均匀过渡","连接体蜡型应避开组织倒凹区","支架蜡型各部件可分别制作后粘接","蜡型完成后应检查就位道一致性","舌杆蜡型上缘应置于舌隆突之上"],"answer":[0,1,3],"explanation":"知识点：支架蜡型制作要点。正确项：卡环臂需均匀过渡保证弹性；连接体避开倒凹；蜡型完成后须核对就位道。错误项：分件制作后粘接会形成薄弱界面；舌杆上缘应位于舌隆突之下而非之上。","tier":"挑战"},{"id":131,"type":"single","stem":"制作钴铬合金铸造支架时，模型上耐火材料模型的工作间隙（间隙涂料）通常涂布几层以补偿合金铸造收缩","options":["涂布1层，厚度约10μm","涂布2层，厚度约20～30μm","涂布3层，厚度约50μm","不涂布，靠包埋材料膨胀补偿"],"answer":[1],"explanation":"知识点：钴铬合金铸造收缩补偿。钴铬合金线收缩率约为1.5%～2.0%，临床上常在耐火模型工作区涂布2层间隙涂料（约20～30μm）来补偿铸造收缩。涂1层补偿不足易导致铸件过紧；涂3层补偿过度易导致铸件就位后松动；完全不涂布则铸件无法就位。","tier":"进阶"},{"id":132,"type":"single","stem":"全口义齿排牙时，上颌第一磨牙的近中舌尖应位于哪个位置","options":["下颌第一磨牙近中颊沟内","下颌第一磨牙中央窝内","下颌第一磨牙远中颊沟内","下颌第一磨牙近中舌沟内"],"answer":[0],"explanation":"知识点：全口义齿人工牙排列的𬌗关系。上颌第一磨牙的近中舌尖对应下颌第一磨牙的近中颊沟，形成牙尖交错𬌗的尖窝关系。中央窝对应上颌第一磨牙近中舌尖以外的牙尖；远中颊沟对应上颌第二磨牙的近中舌尖；近中舌沟无对应咬合关系。","tier":"进阶"},{"id":133,"type":"single","stem":"制作可摘局部义齿时，卡环臂进入倒凹区的深度通常为多少","options":["0.10mm","0.25mm","0.50mm","0.75mm"],"answer":[1],"explanation":"知识点：卡环臂进入倒凹深度的设计。钴铬合金铸造卡环弹性较小，进入倒凹深度一般为0.25mm；0.10mm固位力不足易脱位；0.50mm和0.75mm超出合金弹性极限，就位困难且易导致基牙损伤或卡环变形。","tier":"基础"},{"id":134,"type":"single","stem":"在石膏模型上制作熔模时，蜡型表面出现菲薄锐利的飞边，最可能的原因是","options":["蜡液温度过低","蜡液温度过高","模型表面未涂分离剂","蜡刀压力过大"],"answer":[1],"explanation":"知识点：熔模制作中蜡液温度对蜡型质量的影响。蜡液温度过高时流动性过强，易渗入模型细微间隙形成菲薄锐利飞边。蜡液温度过低则蜡型表面粗糙、流痕明显；未涂分离剂影响脱模而非形成飞边；蜡刀压力过大造成蜡型变形而非飞边。","tier":"进阶"},{"id":135,"type":"single","stem":"铸造全冠蜡型在邻面接触区加蜡时，正确的做法是","options":["邻面接触区蜡型应恢复至对颌牙邻面外形高点稍紧","邻面接触区蜡型应恢复至对颌牙邻面外形高点稍松","邻面接触区蜡型加蜡后需用蜡刀烫软邻面再复位","邻面接触区蜡型应完全不加蜡，靠铸造后调整"],"answer":[0],"explanation":"知识点：全冠蜡型邻面接触区的恢复。正确做法是恢复邻面接触至对颌牙邻面外形高点稍紧，以补偿铸造收缩和打磨损耗。稍松会导致食物嵌塞；加蜡后烫软复位会破坏已恢复的邻面形态；完全不加蜡则接触区无法恢复。","tier":"挑战"},{"id":136,"type":"single","stem":"磷酸盐包埋材料调拌时，使用专用液与使用蒸馏水相比，主要影响的是","options":["包埋材料的凝固时间","包埋材料的膨胀率","包埋材料的透气性","包埋材料的耐热温度"],"answer":[1],"explanation":"知识点：磷酸盐包埋材料液相成分对性能的影响。专用液（硅溶胶）可提高包埋材料的膨胀率，用于补偿合金铸造收缩。凝固时间主要受粉液比和温度影响；透气性与粉液比和粒度分布有关；耐热温度由材料本身成分决定。","tier":"进阶"},{"id":137,"type":"single","stem":"可摘局部义齿支架铸造后，发现卡环臂与基牙之间无间隙且无法就位，最可能的原因是","options":["铸造收缩未补偿","模型倒凹填塞过多","卡环臂蜡型过厚","包埋材料膨胀过大"],"answer":[3],"explanation":"知识点：铸造收缩补偿与就位的关系。包埋材料膨胀过大导致铸件实际尺寸大于设计尺寸，卡环臂紧贴基牙无法就位。铸造收缩未补偿会导致铸件过小而非无法就位；倒凹填塞过多会使卡环臂过松；卡环臂蜡型过厚影响的是卡环弹性而非就位间隙。","tier":"挑战"},{"id":138,"type":"single","stem":"在制作烤瓷熔附金属全冠时，金属基底冠的瓷结合面喷砂处理使用的氧化铝粒度通常为","options":["50μm","110μm","250μm","500μm"],"answer":[1],"explanation":"知识点：金属基底冠表面处理。喷砂处理常用110μm氧化铝颗粒，可清洁表面并形成均匀粗糙面以增强金瓷结合。50μm粒度偏小清洁和粗化效果不足；250μm和500μm粒度过大，会过度磨损金属表面并可能嵌入氧化铝颗粒影响结合。","tier":"进阶"},{"id":139,"type":"multi","stem":"以下关于可摘局部义齿铸造𬌗支托的设计要求，描述正确的有","options":["𬌗支托应位于基牙𬌗面近远中边缘嵴处","𬌗支托的宽度应为基牙颊舌径的1/3～1/2","𬌗支托的厚度应不小于1.0mm","𬌗支托应位于基牙颊面颈1/3处","𬌗支托应与基牙𬌗面形成点接触"],"answer":[0,1,2],"explanation":"知识点：𬌗支托的设计要求。𬌗支托应位于𬌗面近远中边缘嵴处，宽度为颊舌径的1/3～1/2，厚度不小于1.0mm以保证强度。位于颊面颈1/3处的是卡环臂而非𬌗支托；𬌗支托应与𬌗面形成面接触而非点接触，点接触会导致应力集中和基牙损伤。","tier":"挑战"},{"id":140,"type":"single","stem":"制作钴铬合金铸造支架时，模型上的工作区倒凹深度通常控制在多少较为适宜","options":["0.25mm","0.50mm","0.75mm","1.00mm"],"answer":[1],"explanation":"知识点为可摘局部义齿铸造支架的模型设计。钴铬合金卡环臂进入倒凹0.50mm可获得适宜固位力且不易变形，故B正确。0.25mm固位力偏小易脱位；0.75mm和1.00mm进入倒凹过深，就位困难且卡环易永久变形。","tier":"基础"},{"id":141,"type":"single","stem":"用自凝树脂修补热凝基托折裂处时，为增强修补处结合强度，临床常用的处理方法是","options":["将断裂面磨成V形斜面并滴单体溶胀","将断裂面直接对接后涂分离剂","将断裂面磨平后涂凡士林隔离","将断裂面粗糙化后立即加压填胶"],"answer":[0],"explanation":"知识点为基托修理中自凝树脂的粘接处理。V形斜面增大粘接面积，滴单体使界面溶胀形成化学结合，故A正确。直接对接面积小易再折；涂分离剂会阻止结合；涂凡士林同样隔离界面导致粘接失败。","tier":"进阶"},{"id":142,"type":"single","stem":"制作全口义齿时，下列关于后牙排列的叙述正确的是","options":["后牙应排在牙槽嵴顶偏颊侧","后牙应排在牙槽嵴顶偏舌侧","后牙应排在牙槽嵴顶上","后牙应排在牙槽嵴顶偏近中"],"answer":[2],"explanation":"知识点为全口义齿人工后牙的排列位置。后牙排在牙槽嵴顶上可使咬合力沿牙槽嵴长轴传导，有利于义齿稳定，故C正确。偏颊侧或偏舌侧都会形成力矩导致义齿翘动；偏近中会影响咬合关系且不利于稳定。","tier":"进阶"},{"id":143,"type":"single","stem":"焊接正畸带环与颊面管时，为防止焊接处氧化影响焊料流动，操作中常用的助焊剂是","options":["硼砂","石英粉","石膏粉","滑石粉"],"answer":[0],"explanation":"知识点为口腔焊接中助焊剂的选择。硼砂在加热时能清除金属表面氧化物并防止再氧化，改善焊料润湿，故A正确。石英粉、石膏粉、滑石粉均无清除金属氧化物的助焊作用，主要用于耐火材料或模型材料。","tier":"挑战"},{"id":144,"type":"single","stem":"灌注超硬石膏模型时，水粉比低于规定值会导致","options":["模型强度下降且膨胀增大","模型强度提高且膨胀减小","模型强度下降且膨胀减小","模型强度提高且膨胀增大"],"answer":[3],"explanation":"知识点为石膏水粉比对性能的影响。水粉比降低时石膏结晶更致密，强度提高，但结晶膨胀受限后整体膨胀反而增大，故D正确。强度下降和膨胀减小的组合均不符合实际规律，属于把两个变化方向错误搭配。","tier":"进阶"},{"id":145,"type":"single","stem":"可摘局部义齿支架设计中，大连接体应具备的力学要求是","options":["具有一定刚性以分散咬合力","具有弹性以缓冲咬合力","具有可塑性以便椅旁调整","具有脆性以便折断修理"],"answer":[0],"explanation":"知识点为大连接体的设计原则。大连接体需有足够刚性，将一侧咬合力分散传递到对侧及整个支持组织，故A正确。弹性会削弱分散作用；可塑性和脆性均不是支架应有的力学性能，会带来变形或断裂风险。","tier":"进阶"},{"id":146,"type":"single","stem":"制作烤瓷熔附金属冠时，金属基底冠的瓷结合面喷砂处理的主要目的是","options":["增加金属表面粗糙度以提高机械结合","降低金属表面粗糙度以减少应力集中","使金属表面形成氧化膜以提高化学结合","使金属表面钝化以阻止继续氧化"],"answer":[0],"explanation":"知识点为金瓷结合机制。喷砂使金属表面粗化，增大与瓷的接触面积并形成机械嵌合，故A正确。降低粗糙度不利于结合；喷砂本身不是为形成氧化膜，氧化膜由后续预氧化形成；钝化会阻碍化学结合。","tier":"进阶"},{"id":147,"type":"single","stem":"铸造金合金嵌体时，铸道安插方向应遵循的原则是","options":["铸道与嵌体长轴平行","铸道与嵌体长轴垂直","铸道从嵌体最厚处引出","铸道从嵌体最薄处引出"],"answer":[2],"explanation":"知识点为嵌体铸造的铸道设计。铸道应从熔金最后凝固的最厚处引出，保证补缩并减少缩孔，故C正确。与长轴平行或垂直并非通用原则，关键看厚度；从最薄处引出会使薄处先冷却堵塞，熔金无法补缩。","tier":"进阶"},{"id":148,"type":"single","stem":"临床上试戴可摘局部义齿时，发现义齿就位后基托边缘压迫牙龈发白，正确的处理是","options":["调磨基托边缘对应压迫区","加厚基托边缘增加密合","降低整个基托组织面","重做印模重新制作"],"answer":[0],"explanation":"知识点为义齿试戴中基托边缘压迫的处理。局部压迫发白说明该处基托边缘过长或过突，应调磨对应压迫区，故A正确。加厚基托会加重压迫；整体降低组织面会破坏密合并影响固位；局部可调磨解决时无需重做。","tier":"挑战"},{"id":149,"type":"single","stem":"制作正畸活动矫治器的自凝塑料基托时，为避免基托内产生气泡，较合理的操作是","options":["粉液混合后立即涂塑","粉液混合后待其拉丝期再涂塑","粉液混合后待其完全固化再涂塑","粉液混合后加水稀释再涂塑"],"answer":[1],"explanation":"知识点为自凝树脂的涂塑时机。粉液混合后经历稀糊期、拉丝期、面团期，拉丝期涂塑既有流动性又不易夹入气泡，故B正确。立即涂塑太稀易产生气泡；完全固化无法塑形；加水稀释会破坏树脂性能并产生气泡。","tier":"进阶"},{"id":150,"type":"multi","stem":"关于可摘局部义齿铸造卡环的固位臂与对抗臂，下列设计合理的包括","options":["固位臂位于基牙颊侧倒凹区","对抗臂位于基牙舌侧非倒凹区","固位臂与对抗臂均位于倒凹区","对抗臂位于基牙颊侧非倒凹区"],"answer":[0,1],"explanation":"知识点为铸造卡环的固位臂与对抗臂设计。固位臂应位于倒凹区以产生固位力，对抗臂应位于非倒凹区以对抗侧向力，故A、B正确。两臂均位于倒凹区会导致就位困难且基牙受力异常；对抗臂位于颊侧非倒凹区在常规设计中没有对抗舌侧固位臂的作用，位置搭配不合理。","tier":"挑战"},{"id":151,"type":"single","stem":"可摘局部义齿铸造钴铬合金支架在电解抛光后，为消除表面残留的氧化膜并提高后续焊接质量，通常应进行的一道处理是","options":["喷砂处理","酸洗处理","蒸汽清洗","超声清洗"],"answer":[1],"explanation":"知识点：钴铬合金支架电解抛光后表面会形成氧化膜，需酸洗去除。喷砂用于粗化或清理铸件表面，不能去除化学氧化膜；蒸汽清洗主要去油污和碎屑；超声清洗用于去除细小颗粒，均不能替代酸洗。","tier":"进阶"},{"id":152,"type":"single","stem":"制作全口义齿蜡型时，人工牙排列完成后，蜡基托在模型边缘的伸展应达到","options":["黏膜转折处稍浅于前庭沟底","前庭沟底并超出转折处1mm","唇颊系带根部并越过系带","下颌舌骨后窝之外2mm"],"answer":[0],"explanation":"知识点：全口义齿基托边缘伸展应达黏膜转折处但不压迫，稍浅于前庭沟底可保证边缘封闭又不致压痛。超出转折处会造成压痛和脱位；越过系带会限制系带活动；超出舌骨后窝会造成恶心和压痛。","tier":"进阶"},{"id":153,"type":"single","stem":"在可摘局部义齿设计中，当基牙出现I度松动且牙槽嵴吸收明显时，为减小基牙扭力，常采用的卡环类型是","options":["回力卡环","对半卡环","圈形卡环","RPI卡环"],"answer":[3],"explanation":"知识点：RPI卡环由近中支托、邻面板和I杆组成，受力时基牙向近中移动，可减小对基牙的扭力，适用于基牙条件较差的情况。回力卡环多用于前磨牙；对半卡环用于孤立基牙；圈形卡环用于远中孤立磨牙，均不能有效减小扭力。","tier":"进阶"},{"id":154,"type":"single","stem":"某技师在制作金属烤瓷冠时发现烤瓷层在冷却后出现放射状裂纹，最可能的原因是","options":["金属基底冠过厚","烤瓷炉升温速率过慢","金瓷热膨胀系数不匹配","瓷层厚度不足0.5mm"],"answer":[2],"explanation":"知识点：金瓷热膨胀系数不匹配是导致瓷层裂纹的常见原因，瓷的热膨胀系数应略小于金属。金属基底冠过厚主要影响就位和美观；升温过慢一般不引起裂纹；瓷层过薄主要影响颜色和强度，不是放射状裂纹的主因。","tier":"挑战"},{"id":155,"type":"single","stem":"某患者下颌Kennedy第一类缺失，设计可摘局部义齿时，为减小游离端基托下沉对基牙的扭力，应优先考虑","options":["增加卡环数量","采用应力中断设计","加大基托面积","选用刚性连接体"],"answer":[1],"explanation":"知识点：游离端缺失时，功能状态下基托下沉会通过卡环对基牙产生扭力，应力中断设计可断开或缓冲该力。增加卡环数量会加大扭力；加大基托面积可分散合力但不解决扭力传导；刚性连接体反而使扭力直接传至基牙。","tier":"挑战"},{"id":156,"type":"single","stem":"在制作烤瓷熔附金属冠时，金属基底冠的舌侧金瓷交界处应设计为","options":["直角对接","斜面或浅凹形","深凹槽形","刃状边缘"],"answer":[1],"explanation":"知识点：金瓷交界处应设计为斜面或浅凹形，以分散应力、防止瓷层崩裂。直角对接易产生应力集中；深凹槽形会造成瓷层厚度不均；刃状边缘多用于全金属冠，不适用于金瓷交界。","tier":"基础"},{"id":157,"type":"single","stem":"某技师在灌注超硬石膏模型时，发现模型表面出现大量气泡，最可能的原因是","options":["石膏粉加入水中后立即搅拌","石膏粉与水比例过大","调拌时采用真空搅拌","调拌时间不足10秒"],"answer":[0],"explanation":"知识点：灌注石膏时应先将粉撒入水中让其浸润，再缓慢搅拌，立即搅拌会将空气带入形成气泡。粉水比过大主要影响强度和流动性；真空搅拌可减少气泡；调拌时间不足主要影响均匀性。","tier":"挑战"},{"id":158,"type":"single","stem":"可摘局部义齿的间接固位体主要作用是","options":["直接卡抱基牙防止脱位","防止义齿翘动和旋转","替代支托传递合力","增强基托与黏膜的吸附力"],"answer":[1],"explanation":"知识点：间接固位体位于支点线对侧，作用是防止义齿翘动、旋转和脱位。直接卡抱基牙是直接固位体的作用；替代支托传递合力不是间接固位体的功能；增强吸附力是全口义齿基托的作用。","tier":"基础"},{"id":159,"type":"single","stem":"在焊接钴铬合金支架时，为防止焊件变形，正确的操作是","options":["先焊一端再焊另一端","将焊件整体均匀预热后一次焊完","在冷态下直接快速焊接","用大火力集中加热焊接区"],"answer":[1],"explanation":"知识点：焊接钴铬合金时应整体均匀预热，避免局部温差导致变形，再完成焊接。先焊一端再焊另一端会因收缩不均变形；冷态直接快速焊接易产生热应力；大火力集中加热会造成局部过热变形。","tier":"进阶"},{"id":160,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需预留的铸造收缩补偿量通常依据什么确定","options":["合金的线收缩率与铸圈内径","铸型的预热温度与升温速率","包埋材料的膨胀量与合金收缩量匹配","蜡型的厚度与安插铸道的位置"],"answer":[2],"explanation":"知识点为铸造收缩补偿原理。正确项：铸件精度依靠包埋材料膨胀补偿合金冷却收缩，二者需匹配。错误项A线收缩率是合金属性，但铸圈内径不决定补偿量；B预热温度影响膨胀量但不等于补偿量本身；D蜡型厚度和铸道位置影响铸造缺陷，不直接决定补偿量。","tier":"进阶"},{"id":161,"type":"single","stem":"可摘局部义齿支架的卡环臂进入倒凹区的深度，对铸造钴铬合金卡环通常控制在","options":["0.10mm","0.25mm","0.50mm","0.75mm"],"answer":[1],"explanation":"知识点为卡环固位臂的倒凹深度要求。正确项：钴铬合金弹性较差，通常取0.25mm。错误项A过小固位不足；C、D过大可能导致卡环变形或就位困难。","tier":"基础"},{"id":162,"type":"single","stem":"某技师在制作烤瓷熔附金属全冠时，金属基底冠的唇侧瓷覆盖区预留厚度不足，最可能导致","options":["瓷层透出金属颜色","瓷与金属结合强度下降","金属热膨胀系数改变","基底冠边缘密合度提高"],"answer":[0],"explanation":"知识点为金瓷冠瓷层厚度与遮色效果。正确项：瓷层过薄无法遮盖金属颜色，影响美观。错误项B结合强度主要取决于金瓷结合工艺；C热膨胀系数由材料决定，不因厚度改变；D边缘密合度与瓷层厚度无关。","tier":"进阶"},{"id":163,"type":"single","stem":"在模型灌注石膏时，调拌石膏粉与水后应达到的理想稠度状态是","options":["呈流动液体状","呈牙膏糊状","呈干粉团状","呈颗粒分散状"],"answer":[1],"explanation":"知识点为石膏调拌稠度。正确项：牙膏糊状便于灌注且气泡少、强度好。错误项A过稀导致强度低、气孔多；C过干无法流到模型细微处；D未调匀，无法使用。","tier":"基础"},{"id":164,"type":"single","stem":"铸造全冠蜡型制作时，为补偿合金冷却收缩，常用的方法是","options":["增加蜡型厚度","使用代型间隙涂料","蜡型表面涂凡士林","在蜡型上开排气孔"],"answer":[1],"explanation":"知识点为铸件收缩补偿方式。正确项：代型间隙涂料可补偿合金收缩，保证冠就位。错误项A增厚蜡型只增加瓷层或金属厚度，不补偿收缩；C涂凡士林影响蜡型表面质量；D排气孔用于排气，不补偿收缩。","tier":"进阶"},{"id":165,"type":"single","stem":"某患者全口义齿试戴时，技师发现下颌义齿基托边缘在舌侧翼缘区过长，最可能引起","options":["义齿固位力增强","舌运动受限及压痛","咀嚼效率提高","垂直距离增大"],"answer":[1],"explanation":"知识点为全口义齿基托边缘伸展。正确项：舌侧翼缘过长会限制舌运动并造成压痛。错误项A过长边缘不会增强固位；C咀嚼效率与咬合及固位有关，不因边缘过长提高；D垂直距离由牙合关系决定。","tier":"挑战"},{"id":166,"type":"single","stem":"在制作固定桥时，桥体龈端与牙槽嵴黏膜接触的设计中，卫生桥适用于","options":["牙槽嵴吸收不明显者","牙槽嵴吸收明显者","前牙美学要求高者","基牙条件较差者"],"answer":[0],"explanation":"知识点为桥体龈端设计。正确项：卫生桥桥体与黏膜不接触，适用于牙槽嵴吸收不明显、有足够间隙者。错误项B吸收明显者宜用接触式桥体；C前牙美学多用接触式；D基牙条件差不决定桥体龈端形式。","tier":"进阶"},{"id":167,"type":"single","stem":"用于制作全口义齿基托的甲基丙烯酸甲酯热凝树脂，其聚合过程若升温过快，最可能导致","options":["基托颜色变浅","基托内部出现气泡","基托硬度下降","基托与人工牙结合增强"],"answer":[1],"explanation":"知识点为热凝树脂聚合升温速率。正确项：升温过快使单体沸腾，产生气泡。错误项A颜色由颜料及聚合程度决定，不因升温快变浅；C硬度与聚合度有关，气泡才是主要缺陷；D结合强度与人工牙处理有关。","tier":"进阶"},{"id":168,"type":"single","stem":"某技师在打磨钴铬合金支架时，发现局部有砂眼，正确的处理方式是","options":["直接抛光掩盖砂眼","用焊料填补砂眼","重新铸造该支架","用蜡封闭砂眼"],"answer":[2],"explanation":"知识点为铸造缺陷处理。正确项：砂眼属内部缺陷，应重新铸造。错误项A抛光不能消除内部缺陷；B焊料填补影响强度与密合；D蜡封闭无强度，不能用于口内。","tier":"挑战"},{"id":169,"type":"single","stem":"制作钴铬合金铸造支架时，模型上设计铸造收缩补偿的主要目的是补偿哪一环节的尺寸变化","options":["合金从液态到固态的冷却收缩","印模材料凝固时的弹性回复","石膏模型吸水膨胀造成的体积增大","耐火材料包埋后的热膨胀"],"answer":[0],"explanation":"知识点是铸造收缩补偿原理。液态合金冷却凝固时产生线收缩，需通过模型放大或包埋材料膨胀补偿；印模弹性回复影响的是印模精度而非铸造收缩；石膏模型吸水膨胀是模型精度问题，与合金收缩无关；耐火材料热膨胀是补偿手段之一，不是被补偿的对象。","tier":"进阶"},{"id":170,"type":"single","stem":"可摘局部义齿支架弯制时，卡环臂进入基牙倒凹区的深度通常应控制在","options":["0.25mm左右","0.75mm左右","1.25mm左右","1.75mm左右"],"answer":[0],"explanation":"知识点是卡环固位臂倒凹深度。钴铬合金弯制卡环固位臂进入倒凹约0.25mm可获得合适固位力；0.75mm过深导致就位困难且易损伤基牙；1.25mm和1.75mm明显过深，会造成卡环变形或基牙损伤。","tier":"进阶"},{"id":171,"type":"single","stem":"制作全口义齿时，若模型上后堤区封闭不良，最可能导致患者出现哪种临床表现","options":["义齿基托边缘过长压迫黏膜","义齿固位不良、易脱位","义齿咬合垂直距离过高","义齿基托颜色不均"],"answer":[1],"explanation":"知识点是全口义齿后堤区封闭作用。后堤区封闭不良会破坏边缘封闭，导致固位不良易脱位；边缘过长是边缘伸展问题，与后堤封闭无关；垂直距离由颌位记录决定；基托颜色由材料与工艺决定。","tier":"进阶"},{"id":172,"type":"single","stem":"在烤瓷熔附金属修复体制作中，金属基底表面预氧化处理的主要作用是","options":["提高金属表面粗糙度以增强机械锁结","形成致密氧化膜以利于瓷金化学结合","清除金属表面残留的包埋材料","降低金属的热膨胀系数"],"answer":[1],"explanation":"知识点是瓷金结合机制。预氧化使金属表面形成可控的致密氧化膜，利于瓷与金属的化学结合；提高粗糙度主要靠喷砂等机械处理；清除包埋材料靠酸洗或喷砂；预氧化不改变金属热膨胀系数。","tier":"基础"},{"id":173,"type":"single","stem":"灌注超硬石膏模型时，为减少气泡，最合适的操作是","options":["将石膏从模型一侧缓慢倒入让其自然流满","将石膏从高处快速冲入印模最深处","调拌后静置数分钟再灌注","用真空调拌并配合从一侧少量逐步添加"],"answer":[3],"explanation":"知识点是模型灌注排气。真空调拌减少混入气泡，从一侧少量逐步添加使石膏缓慢流入并排出空气；从一侧缓慢倒入仍易卷入气泡；高处快速冲入会带入大量气泡；调拌后静置会使石膏初凝影响操作。","tier":"挑战"},{"id":174,"type":"single","stem":"制作金属烤瓷冠时，瓷层出现裂纹且裂纹从金属-瓷结合界面起始，最可能的原因是","options":["瓷粉堆塑时水分过多","金属与瓷热膨胀系数不匹配","烧结温度低于瓷粉要求","瓷层表面抛光不足"],"answer":[1],"explanation":"知识点是瓷金结合失败原因。裂纹从结合界面起始提示界面应力集中，常因金属与瓷热膨胀系数不匹配；瓷粉水分过多易致气泡；烧结温度过低致瓷体不致密；表面抛光不足影响美观与菌斑附着，不引起界面裂纹。","tier":"进阶"},{"id":175,"type":"single","stem":"全口义齿排牙时，前牙覆牙合覆盖的常规要求是","options":["前牙浅覆牙合、浅覆盖","前牙深覆牙合、深覆盖","前牙对刃、无覆盖","前牙反牙合、反覆盖"],"answer":[0],"explanation":"知识点是全口义齿前牙排列。常规应排成浅覆牙合浅覆盖，有利于前伸牙合平衡和美观；深覆牙合深覆盖会限制前伸运动；对刃无覆盖不利于美观与功能；反牙合反覆盖不符合常规全口义齿排牙原则。","tier":"进阶"},{"id":176,"type":"single","stem":"在制作嵌体蜡型时，为补偿合金铸造收缩，常用的方法是","options":["蜡型表面涂布分离剂","蜡型整体放大后铸造","使用高膨胀包埋材料","延长蜡型冷却时间"],"answer":[2],"explanation":"知识点是嵌体铸造收缩补偿。临床常用高膨胀包埋材料在加热时膨胀来补偿合金收缩；蜡型表面涂分离剂是防粘；蜡型整体放大不易精确控制；延长冷却时间与收缩补偿无关。","tier":"进阶"},{"id":177,"type":"single","stem":"某患者戴用可摘局部义齿后主诉咀嚼时义齿翘动，检查发现基托边缘与黏膜之间有间隙，最可能的制作原因是","options":["基托边缘过长","模型工作区刮除过多","卡环固位力过大","人工牙排列偏颊"],"answer":[1],"explanation":"知识点是基托密合性。模型工作区刮除过多会造成基托与黏膜间间隙，导致翘动；边缘过长会引起压痛而非间隙翘动；卡环固位力过大主要影响摘戴；人工牙偏颊影响咬合与美观，不直接造成基托间隙。","tier":"挑战"},{"id":178,"type":"single","stem":"全口义齿排牙时，上颌第二磨牙的远中面应位于","options":["磨牙后垫前缘","磨牙后垫中份","磨牙后垫后缘","翼上颌切迹前方"],"answer":[0],"explanation":"知识点：全口义齿后牙排列的后界标志。正确项：上颌第二磨牙远中面应与磨牙后垫前缘平齐，这是公认的排牙后界参考。错误项：磨牙后垫中份过靠后，会导致后牙覆盖过多；磨牙后垫后缘更靠后，破坏后牙区功能间隙；翼上颌切迹是上颌义齿基托的后缘伸展标志，不是磨牙排列的参考。","tier":"基础"},{"id":179,"type":"single","stem":"可摘局部义齿支架中，起固位作用的卡环臂应位于基牙的","options":["倒凹区","非倒凹区","外形高点处","咬合面边缘"],"answer":[0],"explanation":"知识点：卡环固位臂的位置。正确项：固位臂末端应进入基牙倒凹区，利用弹性变形产生固位力。错误项：非倒凹区是可对抗臂（稳定臂）的位置，不产生固位；外形高点处卡环臂无法获得固位力；咬合面边缘与卡环固位无关。","tier":"基础"},{"id":180,"type":"single","stem":"制作烤瓷熔附金属冠时，金属基底冠的厚度一般要求为","options":["0.1～0.2mm","0.3～0.5mm","0.6～0.8mm","1.0～1.2mm"],"answer":[1],"explanation":"知识点：金属基底冠厚度要求。正确项：0.3～0.5mm是公认的金属基底冠厚度范围，既能保证强度又为瓷层留出空间。错误项：0.1～0.2mm过薄，铸造易变形且强度不足；0.6～0.8mm过厚，会挤压瓷层空间导致颜色发暗；1.0～1.2mm远超实际需要，破坏修复体外形。","tier":"基础"},{"id":181,"type":"single","stem":"患者全口义齿戴用后主诉下颌前伸时义齿翘动，检查发现下颌义齿后缘基托与磨牙后垫不贴合，最可能的原因是","options":["基托后缘伸展不足","基托后缘过度伸展","垂直距离过低","中性区记录错误"],"answer":[1],"explanation":"知识点：全口义齿基托后缘伸展与翘动的关系。正确项：基托后缘过度伸展至磨牙后垫之后，会顶住活动软组织，前伸时产生翘动。错误项：伸展不足一般造成固位差而非翘动；垂直距离过低主要表现为面容苍老、咀嚼无力；中性区记录错误主要影响义齿稳定性，但与该特定症状关系不如过度伸展直接。","tier":"挑战"},{"id":182,"type":"single","stem":"制作石膏模型时，调拌人造石的水粉比偏大（水过多）会导致","options":["凝固膨胀增大","凝固时间缩短","模型强度下降","表面硬度提高"],"answer":[2],"explanation":"知识点：水粉比对石膏模型性能的影响。正确项：水粉比偏大时凝固体孔隙率增加，强度明显下降。错误项：凝固膨胀与水粉比关系复杂，并非主要因水多而增大；凝固时间缩短与水粉比偏大关系不成立，实际是延长；表面硬度会因孔隙增加而下降，不会提高。","tier":"基础"},{"id":183,"type":"single","stem":"某技师在焊接钴铬合金支架时，焊料未能充分流动铺展，最可能的原因是","options":["焊接区预热温度过高","焊料熔点高于合金熔点","焊接区氧化膜未彻底清除","焊接火焰采用还原焰"],"answer":[2],"explanation":"知识点：金属焊接中焊料流动不良的原因。正确项：焊接区氧化膜未清除会阻碍焊料润湿铺展，是常见原因。错误项：预热温度过高反而利于流动；焊料熔点应低于被焊合金，若高于则无法焊接但题目说的是未充分流动；还原焰有助于防止氧化，不是流动不良的原因。","tier":"进阶"},{"id":184,"type":"single","stem":"在全口义齿制作中，后堤区的功能是","options":["增强义齿基托强度","形成边缘封闭提高固位","缓冲下颌隆突压迫","引导下颌前伸运动"],"answer":[1],"explanation":"知识点：全口义齿后堤区的作用。正确项：后堤区通过轻微压迫腭部软组织形成边缘封闭，增强上颌义齿固位。错误项：增强基托强度是基托材料与厚度设计的任务；缓冲下颌隆突属于缓冲处理，与后堤区无关；引导下颌运动是𬌗面设计的内容。","tier":"基础"},{"id":185,"type":"single","stem":"患者上颌全口义齿戴用一周后，腭中缝处出现压痛点，最合适的处理方法是","options":["调磨腭中缝处基托组织面","加高腭中缝处基托","重新取模制作义齿","调磨腭中缝处𬌗面"],"answer":[0],"explanation":"知识点：全口义齿压痛点处理。正确项：腭中缝处骨质隆起、黏膜薄，缓冲该处基托组织面可解除压痛。错误项：加高基托会加重压迫；重新取模制作属于过度处理，首选缓冲；调磨𬌗面不能解决组织面压迫问题。","tier":"挑战"},{"id":186,"type":"single","stem":"某患者铸造金属全冠试戴时，邻接过紧无法就位，技师在模型上检查发现邻面接触区打磨量不足，正确的处理方法是","options":["调磨全冠邻面接触区","调磨邻牙接触区","调磨全冠𬌗面","调磨全冠颈缘"],"answer":[0],"explanation":"知识点：铸造全冠邻接过紧的处理。正确项：应调磨全冠邻面接触区，恢复合适接触关系。错误项：调磨邻牙会损伤健康牙体；调磨𬌗面影响咬合关系，不能解决邻接过紧；调磨颈缘影响边缘密合度，与邻接无关。","tier":"挑战"},{"id":187,"type":"multi","stem":"全口义齿基托边缘伸展应遵循的原则包括","options":["上颌基托后缘应覆盖后堤区","下颌基托后缘应覆盖磨牙后垫","基托边缘应止于黏膜反折线处","基托边缘应尽量伸展至骨性倒凹区","唇颊系带区基托应做缓冲"],"answer":[0,1,4],"explanation":"知识点：全口义齿基托边缘伸展原则。正确项：上颌后缘覆盖后堤区利于封闭；下颌后缘覆盖磨牙后垫利于固位；系带区缓冲避免压迫。错误项：基托边缘应止于黏膜反折线之前而非反折线处，越过反折线会压迫；基托边缘不应进入骨性倒凹区，否则无法就位且压迫组织。","tier":"进阶"},{"id":188,"type":"single","stem":"制作钴铬合金铸造支架时，模型上设计的大连接体厚度不足会导致支架在口内出现哪种典型问题","options":["连接体弹性变形量增大","连接体抗挠曲强度下降","连接体就位道方向偏移","连接体与基牙密合度提高"],"answer":[1],"explanation":"知识点为大连接体的力学要求。钴铬合金大连接体需足够厚度以保证刚度，厚度不足会使抗挠曲强度下降，受力时易变形或折断；弹性变形量增大是厚度不足的伴随趋势但临床首要问题是强度不足；就位道方向偏移与厚度无关，由共同就位道设计决定；密合度提高与厚度不足无因果关系。","tier":"进阶"},{"id":189,"type":"single","stem":"在可摘局部义齿支架蜡型制作中，前腭杆与黏膜的关系应设计为","options":["与前腭黏膜紧密接触","离开黏膜约0.5mm","离开黏膜约2mm","仅与腭中缝接触"],"answer":[0],"explanation":"知识点为前腭杆的适合性要求。前腭杆位于前腭区，需与黏膜紧密接触以提供支持和稳定，同时避开腭隆突；离开0.5mm或2mm均会造成食物嵌塞和支托支持不足；仅与腭中缝接触不能提供广泛支持且不符合设计原则。","tier":"进阶"},{"id":190,"type":"single","stem":"全口义齿制作中，后牙区人工牙排列时若形成明显的Spee曲线加深，最可能造成的临床后果是","options":["前伸咬合时后牙早接触","侧方咬合时平衡侧接触增强","正中咬合时前牙区脱离接触","下颌前伸运动受限"],"answer":[0],"explanation":"知识点为全口义齿补偿曲线与咬合平衡。Spee曲线过深会使前伸运动时后牙区形成早接触，破坏前伸平衡；侧方平衡侧接触增强与Spee曲线加深无直接对应；正中咬合前牙脱离多与前牙排列覆合有关；下颌前伸受限多与髁道或前牙排列有关。","tier":"进阶"},{"id":191,"type":"single","stem":"某技师在铸造纯钛支架时使用磷酸盐包埋材料，铸件表面出现明显气孔和反应层，最可能的原因是","options":["包埋材料透气性不足","钛与包埋材料发生化学反应","铸造温度低于钛熔点","铸型冷却速度过快"],"answer":[1],"explanation":"知识点为纯钛铸造对包埋材料的要求。钛化学活性高，高温下与磷酸盐包埋材料反应生成反应层和气孔；透气性不足主要影响充填而非反应层；温度低于熔点会导致充填不全而非气孔；冷却过快主要引起收缩裂纹。","tier":"进阶"},{"id":192,"type":"single","stem":"在制作金属烤瓷冠时，贵金属基底冠与瓷结合前需要进行的前处理是","options":["喷砂后直接堆瓷","打磨后酸洗再堆瓷","喷砂后涂布粘结剂","电解抛光后堆瓷"],"answer":[2],"explanation":"知识点为贵金属与瓷的结合机制。贵金属需喷砂粗化后涂布专用粘结剂以增强化学结合；喷砂后直接堆瓷缺乏化学结合介质；打磨后酸洗主要用于非贵金属去氧化层；电解抛光会过度光滑不利于机械嵌合。","tier":"进阶"},{"id":193,"type":"single","stem":"可摘局部义齿的卡环臂进入基牙倒凹区的深度通常应控制在","options":["0.01mm以内","0.25mm左右","0.75mm左右","1.5mm左右"],"answer":[1],"explanation":"知识点为卡环固位臂的倒凹深度。钴铬合金卡环臂通常进入0.25mm倒凹以获得适宜固位力；0.01mm几乎无固位；0.75mm和1.5mm过深会造成取戴困难和基牙损伤。","tier":"进阶"},{"id":194,"type":"single","stem":"在制作陶瓷熔附金属冠时，金属基底冠的瓷覆盖区金瓷交界处应设计为","options":["直角对接","锐角对接","斜坡形对接","台阶形对接"],"answer":[2],"explanation":"知识点为金瓷结合区的设计。金瓷交界处应设计为斜坡形，使瓷层厚度逐渐过渡，避免应力集中；直角、锐角和台阶形均会造成应力集中或瓷层过薄而崩瓷。","tier":"进阶"},{"id":195,"type":"single","stem":"某技师在制作全口义齿时，发现下颌模型后堤区未做适当缓冲，最可能造成的问题是","options":["义齿基托后缘不密合","义齿基托后缘压迫黏膜","义齿基托后缘容易折断","义齿基托后缘影响发音"],"answer":[1],"explanation":"知识点为全口义齿后堤区的处理。后堤区需适当缓冲以避免压迫黏膜；未缓冲会造成压迫而非不密合；折断与厚度和材料有关；发音影响主要与基托厚度和范围有关。","tier":"挑战"},{"id":196,"type":"single","stem":"钴铬合金铸造支架在打磨抛光时，若使用过大的压力长时间打磨同一部位，最可能导致","options":["支架表面光洁度提高","支架局部产生过热变形","支架耐腐蚀性增强","支架与基牙密合度改善"],"answer":[1],"explanation":"知识点为支架打磨的操作要点。过大压力长时间打磨会使局部过热，导致支架变形；光洁度提高需适宜压力而非过大；耐腐蚀性主要与材料和抛光质量有关；密合度由铸造和就位决定。","tier":"进阶"},{"id":197,"type":"multi","stem":"在制作可摘局部义齿时，下列哪些措施有助于提高义齿的固位和稳定","options":["合理设计卡环固位臂进入倒凹的深度","增加间接固位体的数量","将大连接体设计得尽量薄","扩大基托覆盖面积至黏膜转折处","使支托位于基牙面近远中边缘"],"answer":[0,1,4],"explanation":"知识点为可摘局部义齿固位稳定设计。合理倒凹深度提供适宜固位力；增加间接固位体可对抗翘动和旋转；支托位于面近远中边缘有利于支持；大连接体过薄会降低刚度；基托过度伸展至黏膜转折处会引起压痛和翘动。","tier":"挑战"},{"id":198,"type":"single","stem":"全口义齿人工牙排列时，上颌第一磨牙的颊尖应位于","options":["磨牙后垫前缘","上颌结节下方","下颌牙槽嵴顶区","下颌磨牙后垫中份"],"answer":[0],"explanation":"知识点：全口义齿中性区与后牙排列定位。正确项：上颌第一磨牙颊尖应正对磨牙后垫前缘，是后牙排列的重要标志。错误项：上颌结节下方位置偏后；下颌牙槽嵴顶区未明确前后定位；下颌磨牙后垫中份对应关系错误。","tier":"基础"},{"id":199,"type":"single","stem":"可摘局部义齿支架中，卡环臂进入倒凹的深度一般为","options":["0.25mm","0.75mm","1.25mm","1.75mm"],"answer":[0],"explanation":"知识点：铸造卡环臂倒凹深度。正确项：钴铬合金铸造卡环臂一般进入0.25mm倒凹。错误项：0.75mm为弯制钢丝卡环常用值；1.25mm过深易导致就位困难及卡环变形；1.75mm明显超出常规。","tier":"基础"},{"id":200,"type":"single","stem":"磷酸盐包埋材料调拌时，粉液比增大将导致","options":["凝固膨胀增大","凝固膨胀减小","凝固时间缩短","热膨胀系数降低"],"answer":[0],"explanation":"知识点：包埋材料粉液比对膨胀的影响。正确项：粉液比增大，凝固膨胀增大。错误项：凝固膨胀减小与规律相反；凝固时间缩短不是主要变化；热膨胀系数降低与粉液比关系不符。","tier":"基础"},{"id":201,"type":"single","stem":"制作全口义齿时，患者下颌牙槽嵴严重吸收呈刃状，正确的处理是","options":["直接常规取模即可","采用压力印模法缓冲","用个别托盘加蜡堤取模","用藻酸盐一次印模法取模"],"answer":[1],"explanation":"知识点：特殊牙槽嵴印模方法。正确项：刃状牙槽嵴需压力印模并缓冲，避免压痛。错误项：直接常规取模会压迫黏膜；个别托盘加蜡堤取模不是针对刃状嵴的缓冲方法；藻酸盐一次印模法无法实现选择性压力。","tier":"进阶"},{"id":202,"type":"single","stem":"某技师在铸造钴铬合金支架时发现铸件表面有较多圆形气孔，最可能的原因是","options":["铸造温度过高","包埋材料透气性差","铸圈内金属冷却过快","蜡型表面残留分离剂"],"answer":[1],"explanation":"知识点：铸造缺陷原因分析。正确项：包埋材料透气性差使气体无法排出，形成圆形气孔。错误项：铸造温度过高多致缩孔；冷却过快致收缩变形；蜡型残留分离剂致表面粗糙。","tier":"挑战"},{"id":203,"type":"single","stem":"全口义齿排牙时，前牙覆盖一般应为","options":["0.5mm","1mm","2mm","3mm"],"answer":[2],"explanation":"知识点：全口义齿前牙覆盖标准。正确项：前牙覆盖一般为2mm。错误项：0.5mm、1mm过小易咬唇；3mm过大影响美观及发音。","tier":"基础"},{"id":204,"type":"single","stem":"制作可摘局部义齿时，模型观测的目的不包括","options":["确定就位道","确定倒凹深度","确定基牙预备量","确定卡环类型"],"answer":[2],"explanation":"知识点：模型观测的目的。正确项（错误项）：确定基牙预备量不属于模型观测目的。错误项：确定就位道、倒凹深度、卡环类型均为模型观测内容。","tier":"基础"},{"id":205,"type":"single","stem":"某患者全口义齿戴用后主诉说话时义齿有哨音，技师检查发现上颌前牙舌面过于光滑，正确的处理是","options":["调磨前牙切缘","加厚基托边缘","在前牙舌面形成腭皱襞","降低下颌前牙高度"],"answer":[2],"explanation":"知识点：全口义齿哨音原因及处理。正确项：前牙舌面光滑致气流紊乱，应形成腭皱襞。错误项：调磨切缘不解决舌面问题；加厚基托边缘与哨音无关；降低下颌前牙高度不针对原因。","tier":"挑战"},{"id":206,"type":"multi","stem":"在全口义齿基托蜡型制作中，正确的操作包括","options":["基托边缘应形成良好封闭","基托厚度均匀约2mm","腭侧基托可适当加厚","基托边缘应避开系带区","蜡型表面应光滑无气泡"],"answer":[0,1,3],"explanation":"知识点：全口义齿基托蜡型制作要求。正确项：边缘良好封闭、厚度均匀约2mm、避开系带区均为正确操作。错误项：腭侧基托可适当加厚会改变基托适配性；蜡型表面光滑无气泡属基本要求但加厚腭侧错误。","tier":"挑战"},{"id":207,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要形成熔模的固位体部分，若将三臂卡环的卡环臂在模型上直接铺蜡形成，最可能导致成品出现的问题是","options":["卡环臂与基牙贴合过紧无法就位","卡环臂弹性不足且易折断","卡环臂与基牙间存在过大间隙","卡环臂表面出现铸造缺陷"],"answer":[1],"explanation":"知识点：卡环臂的蜡型制作与铸造收缩补偿。直接在模型上铺蜡制作卡环臂，未做蜡型膨胀补偿和正确的臂部形态控制，铸造后卡环臂易因过薄或形态不当导致弹性不足甚至折断。A项贴合过紧通常是蜡型过厚或未留间隙所致，与直接铺蜡无必然关系；C项间隙过大与蜡型厚度控制有关，不是直接铺蜡的主要后果；D项表面缺陷主要与铸造工艺有关，不是蜡型制作方式的主要问题。","tier":"进阶"},{"id":208,"type":"single","stem":"某技师在制作全口义齿时，发现上颌石膏模型腭部正中区有气泡，正确处理方式为","options":["用蜡填补气泡后直接制作基托","将气泡区域磨除后重新灌注该区域石膏","在气泡表面涂分离剂后继续操作","将整个模型废弃重新取模灌注"],"answer":[1],"explanation":"知识点：石膏模型缺陷的处理。腭部气泡会影响基托与组织的密合度，正确做法是磨除气泡区域并重新灌注石膏修补。A项用蜡填补不能恢复石膏模型的强度和精确形态；C项涂分离剂不能消除气泡带来的形态缺陷；D项整个废弃过于极端，局部修补即可。","tier":"挑战"},{"id":209,"type":"single","stem":"在烤瓷熔附金属修复体中，金瓷结合的主要机制是","options":["机械嵌合结合","化学键结合","范德华力结合","压缩结合"],"answer":[1],"explanation":"知识点：金瓷结合机制。金瓷结合以化学键结合为主，即金属表面氧化膜与瓷中的氧化物发生化学反应形成化学键。A项机械嵌合是辅助作用但不是主要机制；C项范德华力属于次要的分子间力；D项压缩结合是瓷层设计原则而非结合机制。","tier":"基础"},{"id":210,"type":"single","stem":"义齿基托树脂聚合过程中，若采用水浴加热法，从室温升至100℃的时间应控制在","options":["10分钟内快速升温","30至60分钟缓慢升温","90分钟以上极慢升温","直接放入沸水中无需控制"],"answer":[1],"explanation":"知识点：热凝树脂水浴加热聚合程序。从室温升至100℃应缓慢进行，一般控制在30至60分钟，以避免树脂内部产生气泡和聚合不均匀。A项升温过快会使树脂内部产热剧烈产生气泡；C项极慢升温虽减少气泡但耗时过长且可能聚合不完全；D项直接沸水加热会导致大量气泡和变形。","tier":"进阶"},{"id":211,"type":"single","stem":"某患者下颌Kennedy第二类缺失，设计可摘局部义齿时，模型上观测线为二型观测线，基牙近缺隙侧倒凹大，此时卡环设计应选择","options":["一型卡环，卡环臂位于非倒凹区","二型卡环，卡环臂进入近缺隙侧倒凹","三型卡环，卡环臂位于舌侧倒凹","环形卡环，卡环臂环绕基牙"],"answer":[1],"explanation":"知识点：观测线与卡环类型选择。二型观测线特点是近缺隙侧倒凹大、远缺隙侧倒凹小，应选用二型卡环（杆形卡环），卡环臂从近缺隙侧进入倒凹获得固位。A项一型卡环适用于一型观测线（近远缺隙侧倒凹均适中）；C项三型卡环适用于三型观测线；D项环形卡环多用于孤立基牙，不针对二型观测线。","tier":"挑战"},{"id":212,"type":"single","stem":"全口义齿排牙时，上颌后牙排列的颊舌向位置应使牙冠长轴与颌平面之间的关系为","options":["牙冠长轴垂直于颌平面","牙冠长轴略向颊侧倾斜","牙冠长轴略向舌侧倾斜","牙冠长轴与颌平面呈45度角"],"answer":[2],"explanation":"知识点：全口义齿后牙排列原则。上颌后牙牙冠长轴应略向舌侧倾斜，以将咀嚼力传导至牙槽嵴顶，符合生物力学要求。A项垂直排列会使力偏向颊侧，加速牙槽骨吸收；B项向颊侧倾斜同样不利于力传导；D项45度角不符合全口义齿排牙的生物力学原则。","tier":"进阶"},{"id":213,"type":"single","stem":"制作陶瓷熔附金属烤瓷冠时，金属基底冠的厚度一般要求为","options":["0.1至0.2毫米","0.3至0.5毫米","0.6至0.8毫米","1.0至1.2毫米"],"answer":[1],"explanation":"知识点：金属基底冠厚度要求。金属基底冠一般要求0.3至0.5毫米，既能保证足够的强度支撑瓷层，又能为瓷层提供足够空间。A项过薄会导致金属基底强度不足、变形；C项过厚会占用瓷层空间导致瓷层过薄透色；D项过厚同样影响瓷层厚度和美观效果。","tier":"基础"},{"id":214,"type":"single","stem":"某技师在制作可摘局部义齿支架时，需要在模型上确定义齿的就位道，以下操作中正确的是","options":["选择使所有基牙倒凹最小的方向作为就位道","选择使所有基牙倒凹最大的方向作为就位道","就位道应使义齿就位时对基牙的扭力最大","就位道一旦确定后不可调整观测角度"],"answer":[0],"explanation":"知识点：就位道的确定原则。就位道应选择使各基牙倒凹尽可能小且分布合理的方向，以利于义齿的摘戴和固位。B项倒凹最大会导致义齿难以就位且卡环设计困难；C项扭力最大会损伤基牙；D项观测角度在设计中可根据需要调整。","tier":"挑战"},{"id":215,"type":"single","stem":"在制作烤瓷冠时，瓷层堆塑完成后需要进行烧结，若烧结温度过高，最可能出现的缺陷是","options":["瓷层出现气泡","瓷层表面粗糙无光泽","瓷层颜色变深","金属基底变形"],"answer":[1],"explanation":"知识点：烤瓷烧结温度对瓷层质量的影响。烧结温度过高会导致瓷层过度熔化，表面玻璃化不足而呈粗糙无光泽状。A项气泡主要由烧结升温过快或瓷粉混合不当引起；C项颜色变深与瓷粉种类和厚度有关；D项金属基底变形主要与金属熔点或铸造缺陷有关。","tier":"进阶"},{"id":216,"type":"single","stem":"可摘局部义齿基托边缘在唇颊系带处的处理方式应为","options":["基托边缘越过系带区以增强固位","基托边缘止于系带区并做缓冲","基托边缘紧贴系带根部加压","基托边缘在系带区加厚延长"],"answer":[1],"explanation":"知识点：可摘局部义齿基托边缘伸展。正确项正确：系带区基托边缘应避开并做缓冲，防止系带活动时压痛或脱位。错误项A错在越过系带会限制活动；错误项C错在加压会压迫系带；错误项D错在加厚延长同样妨碍系带运动。","tier":"进阶"},{"id":217,"type":"single","stem":"固定桥制作中，桥体龈端与牙槽嵴黏膜接触形式选择时，若缺牙区牙槽嵴吸收明显，宜采用","options":["接触式桥体","悬空式桥体","盖嵴式桥体","改良盖嵴式桥体"],"answer":[1],"explanation":"知识点：固定桥桥体龈端设计。正确项正确：牙槽嵴吸收明显时悬空式桥体便于自洁，减少黏膜刺激。错误项A错在接触式桥体要求牙槽嵴条件较好；错误项C错在盖嵴式适用于前牙美学区且嵴条件好；错误项D错在改良盖嵴式同样需较好嵴形态。","tier":"进阶"},{"id":218,"type":"single","stem":"焊接钴铬合金支架时，焊料熔点应","options":["高于被焊金属熔点","等于被焊金属熔点","低于被焊金属熔点","与被焊金属熔点无固定关系"],"answer":[2],"explanation":"知识点：口腔修复焊接原理。正确项正确：焊料熔点必须低于被焊金属熔点，才能在母材不熔化时完成连接。错误项A错在焊料熔点过高会熔穿母材；错误项B错在相等无法实现选择性熔化；错误项D错在熔点关系是焊接的基本条件。","tier":"基础"},{"id":219,"type":"single","stem":"全口义齿试戴时发现下颌义齿在正中咬合时前后翘动，最可能的原因是","options":["下颌基托边缘过长","下颌模型后堤区未做缓冲","下颌牙排列偏唇侧","下颌义齿基托与黏膜间有气泡"],"answer":[0],"explanation":"知识点：全口义齿翘动原因判断。正确项正确：基托边缘过长在功能运动时被组织顶起，导致翘动。错误项B错在后堤区缓冲不足多引起压痛；错误项C错在牙排列偏唇侧主要影响美学和咬合；错误项D错在气泡多引起局部压痛而非前后翘动。","tier":"挑战"},{"id":220,"type":"single","stem":"隐形义齿（弹性义齿）制作中，注塑前对模型的处理应","options":["涂布分离剂后自然干燥","涂布分离剂后立即注塑","不涂分离剂直接注塑","涂布蜡型分离剂后加热"],"answer":[0],"explanation":"知识点：弹性义齿注塑工艺。正确项正确：涂布专用分离剂并自然干燥，保证注塑后易脱模。错误项B错在未干燥会影响分离效果；错误项C错在不涂分离剂难以脱模；错误项D错在蜡型分离剂不适用于注塑模型。","tier":"进阶"},{"id":221,"type":"single","stem":"烤瓷熔附金属冠金属基底冠的厚度通常控制在","options":["0.1～0.2mm","0.3～0.5mm","0.6～0.8mm","0.9～1.2mm"],"answer":[1],"explanation":"知识点：烤瓷冠金属基底冠厚度。正确项正确：0.3～0.5mm既能保证强度又不影响瓷层空间。错误项A错在过薄易变形；错误项C错在过厚会挤压瓷层空间；错误项D错在过厚影响美学和就位。","tier":"基础"},{"id":222,"type":"single","stem":"某患者上颌全口义齿戴用一周后，腭部中线处出现压痕，最可能的原因是","options":["上颌基托腭部缓冲不足","上颌基托边缘过长","上颌后堤区封闭不良","上颌牙排列偏颊侧"],"answer":[0],"explanation":"知识点：全口义齿压痛原因分析。正确项正确：腭中线处骨嵴较突出，缓冲不足会产生压痕。错误项B错在边缘过长多引起边缘区压痛；错误项C错在后堤区封闭不良影响固位；错误项D错在牙排列偏颊侧影响咬合和稳定。","tier":"挑战"},{"id":223,"type":"single","stem":"铸造支架中，大连接体的位置应避开","options":["腭中缝与下颌舌侧系带","上颌硬区与下颌舌隆突","腭皱襞与舌侧翼缘","上颌结节与磨牙后垫"],"answer":[1],"explanation":"知识点：可摘局部义齿大连接体设计。正确项正确：大连接体应避开上颌硬区和下颌舌隆突等骨性隆起，防止压痛。错误项A错在腭中缝通常可覆盖；错误项C错在腭皱襞和舌侧翼缘不是必须避开的骨性区；错误项D错在上颌结节和磨牙后垫需适当覆盖。","tier":"基础"},{"id":224,"type":"single","stem":"瓷贴面粘接前对牙面进行酸蚀处理时，常用的酸蚀剂是","options":["35%磷酸","10%氢氟酸","37%磷酸","5%氢氟酸"],"answer":[2],"explanation":"知识点：瓷贴面粘接前牙面处理。正确项正确：牙釉质酸蚀常用37%磷酸。错误项A错在35%磷酸不是牙面酸蚀的标准浓度；错误项B错在氢氟酸用于瓷面处理；错误项D错在5%氢氟酸浓度不适用于瓷面。","tier":"基础"},{"id":225,"type":"multi","stem":"关于可摘局部义齿铸造卡环臂的设计，正确的有","options":["卡环臂应位于倒凹区以获得固位","卡环臂应位于非倒凹区以利于就位","卡环臂应有足够弹性以通过倒凹","卡环臂应尽可能靠近牙颈部以增强稳定"],"answer":[0,2],"explanation":"知识点：铸造卡环臂设计原则。正确项A正确：卡环臂位于倒凹区才能产生固位力。正确项C正确：足够弹性是卡环通过倒凹并产生固位的前提。错误项B错在非倒凹区不能提供固位；错误项D错在靠近牙颈部并非增强稳定的正确做法，且可能损伤牙龈。","tier":"挑战"},{"id":226,"type":"single","stem":"钴铬合金铸造支架在完成打磨后，发现局部表面有细小砂眼，下列处理方式中最恰当的是","options":["直接抛光后交付使用","用焊料填补砂眼后抛光","切除缺陷区补焊后重新打磨抛光","喷砂后直接进入电解抛光"],"answer":[2],"explanation":"知识点：铸造缺陷的处理原则。砂眼属于铸造内部或表面缺陷，会影响支架强度和适合性，应切除缺陷区补焊后重新打磨抛光。直接抛光后交付使用会留下结构隐患；用焊料填补砂眼无法恢复铸造合金的力学性能；喷砂后直接电解抛光不能消除砂眼缺陷。","tier":"挑战"},{"id":227,"type":"single","stem":"制作烤瓷熔附金属冠时，金属基底冠的瓷结合面喷砂处理应选用的氧化铝粒度是","options":["50μm","110μm","250μm","400μm"],"answer":[1],"explanation":"知识点：金瓷结合面处理。金属基底冠瓷结合面喷砂常用110μm氧化铝，可形成均匀粗糙面增强机械结合。50μm粒度偏细，粗化效果不足；250μm和400μm粒度偏粗，会造成表面过度粗糙甚至嵌入氧化铝颗粒影响结合。","tier":"进阶"},{"id":228,"type":"single","stem":"全口义齿蜡型试排牙时，患者微笑时上中切牙切缘应暴露的长度约为","options":["0.5mm","2mm","5mm","8mm"],"answer":[1],"explanation":"知识点：全口义齿排牙的美学定位。微笑时上中切牙切缘暴露约2mm符合自然美观。0.5mm暴露过少显得苍老；5mm和8mm暴露过多，不符合正常唇齿关系。","tier":"基础"},{"id":229,"type":"single","stem":"制作可摘局部义齿时，模型观测线为三类观测线，基牙近缺隙侧倒凹大，远缺隙侧倒凹小，此类基牙卡环设计宜选用","options":["三臂卡环","双臂卡环","单臂卡环","对半卡环"],"answer":[0],"explanation":"知识点：观测线与卡环设计。三类观测线基牙近缺隙侧倒凹大，远缺隙侧倒凹小，适合三臂卡环，其卡臂尖进入近缺隙侧倒凹区。双臂卡环多用于二类观测线基牙；单臂卡环多用于基托边缘或辅助固位；对半卡环适用于前后均有缺隙的孤立基牙。","tier":"进阶"},{"id":230,"type":"single","stem":"用自凝树脂修补热凝基托折断时，为增强修补区强度，最合理的做法是","options":["将折断端磨成斜面并在基托内加金属丝","直接将断面清洁后涂单体粘接","将折断端磨平后加大自凝树脂用量","在基托表面涂凡士林后加压修补"],"answer":[0],"explanation":"知识点：基托折断修补。折断端磨成斜面并加金属丝可增大粘接面积并增强抗折强度。直接涂单体粘接强度不足；仅加大自凝树脂用量不改变断面受力；涂凡士林会妨碍树脂结合。","tier":"挑战"},{"id":231,"type":"single","stem":"瓷贴面修复前牙时，下列操作有利于提高贴面与牙体粘接强度的是","options":["牙面用37%磷酸酸蚀15秒后涂布粘接剂","牙面用氢氟酸酸蚀后直接粘接","瓷贴面组织面用氢氟酸酸蚀并硅烷化处理","瓷贴面组织面仅用酒精清洁后粘接"],"answer":[2],"explanation":"知识点：瓷贴面粘接前处理。瓷贴面组织面用氢氟酸酸蚀并硅烷化处理可形成微机械嵌合和化学结合。牙面磷酸酸蚀是处理牙釉质，不是瓷面；瓷面用氢氟酸后不硅烷化处理，化学结合不足；仅酒精清洁无法形成有效粘接。","tier":"进阶"},{"id":232,"type":"single","stem":"铸造全冠蜡型制作时，为保证铸造收缩后冠边缘密合，蜡型边缘应","options":["与代型边缘平齐并轻微加压","比代型边缘短0.5mm","超出代型边缘1mm形成飞边","与代型边缘平齐但不上蜡"],"answer":[0],"explanation":"知识点：蜡型边缘处理。蜡型边缘应与代型边缘平齐并轻微加压，补偿铸造收缩，保证边缘密合。短0.5mm会造成边缘不密合；超出形成飞边会导致边缘过长需大量修整；不上蜡则边缘不完整。","tier":"进阶"},{"id":233,"type":"single","stem":"制作金属烤瓷冠时，金属基底冠的瓷层厚度不足会导致","options":["瓷层透出金属颜色","金属基底冠变形","瓷层与金属结合力增强","冠边缘适合性提高"],"answer":[0],"explanation":"知识点：金瓷冠瓷层厚度要求。瓷层厚度不足会透出金属颜色，影响美观。金属基底冠变形与瓷层厚度无直接关系；瓷层过薄不会增强结合力；冠边缘适合性由金属基底冠边缘决定。","tier":"进阶"},{"id":234,"type":"single","stem":"全口义齿制作中，后堤区的目的是","options":["增强义齿基托强度","形成边缘封闭防止空气进入","增加义齿咀嚼效率","减少义齿基托厚度"],"answer":[1],"explanation":"知识点：全口义齿后堤区作用。后堤区位于腭部软硬组织交界处，可形成边缘封闭，防止空气进入基托与组织之间。增强基托强度靠基托材料和厚度；咀嚼效率与人工牙和咬合有关；减少基托厚度与后堤区无关。","tier":"基础"},{"id":235,"type":"single","stem":"某技师在制作钴铬合金支架时，铸圈焙烧后未自然冷却至室温即进行铸造，最可能导致","options":["铸件表面粗糙","铸件内部产生气孔","铸件边缘不密合","铸件颜色发暗"],"answer":[1],"explanation":"知识点：铸造温度与铸件质量。铸圈焙烧后未冷却至室温即铸造，铸圈温度过高会使合金冷却速度过慢，导致内部产生气孔。表面粗糙多与包埋材料粒度或铸造压力有关；边缘不密合多与蜡型或收缩补偿有关；颜色发暗与合金成分或氧化有关。","tier":"进阶"},{"id":236,"type":"multi","stem":"关于全口义齿基托蜡型制作，下列做法正确的有","options":["蜡型厚度应均匀，一般为2mm左右","基托边缘应比模型边缘略短","蜡型表面应光滑无气泡","基托边缘应形成一定的厚度和圆钝外形"],"answer":[0,3],"explanation":"知识点：全口义齿基托蜡型制作要求。蜡型厚度均匀约2mm可保证强度并避免变形；基托边缘形成一定厚度和圆钝外形有利于边缘封闭和舒适。基托边缘应延伸至模型边缘而不是略短；蜡型表面应光滑无气泡，但选项C描述的是蜡型制作的基本要求，而本题要求选出正确的做法，C虽正确但属于常规要求，B明显错误。正确答案为A和D。","tier":"挑战"},{"id":237,"type":"single","stem":"制作钴铬合金铸造支架时，模型上单侧游离缺失的鞍式区蜡型需要做缓冲处理，其主要目的是","options":["补偿合金铸造收缩","避免基托下沉压迫黏膜","防止蜡型变形","便于包埋材料排气"],"answer":[1],"explanation":"游离端鞍式区缓冲是为义齿受力时基托有下沉空间，避免直接压迫黏膜；铸造收缩靠模型放大补偿，与鞍式区缓冲无关；蜡型变形靠温度与操作控制；排气靠包埋与铸道设计。","tier":"进阶"},{"id":238,"type":"single","stem":"可摘局部义齿支架中，前腭杆的截面形态通常设计为","options":["半梨形且宽而薄","圆形且较粗","窄而厚呈条状","扁平且带锐边"],"answer":[0],"explanation":"前腭杆位于前腭区，需兼顾强度与舒适，多做成宽而薄的半梨形；圆形粗杆会明显异物感且不利分散咬合力；窄厚条状易压迫黏膜；带锐边会刺激软组织。","tier":"基础"},{"id":239,"type":"single","stem":"在石膏模型上确定全口义齿的平面时，常以后牙槽嵴顶作为参考，若平面偏高于后牙槽嵴顶过多，最可能造成","options":["义齿固位力增强","舌侧空间减小","咀嚼时义齿翘动","人工牙排列偏唇侧"],"answer":[2],"explanation":"平面过高使咬合力偏离牙槽嵴顶，形成力矩导致义齿翘动脱位；固位力不会因此增强；舌侧空间与平面高度关系不直接；人工牙偏唇侧由排列位置决定。","tier":"进阶"},{"id":240,"type":"single","stem":"铸造桩核蜡型制作时，根管内蜡型表面出现气泡，最可能的原因是","options":["根管壁未完全干燥","蜡液温度过低","分离剂涂布过厚","铸道直径过大"],"answer":[1],"explanation":"蜡液温度过低时流动性差，注入根管易裹入空气形成气泡；根管壁未干燥影响蜡与壁的贴合但多造成蜡型缺损；分离剂过厚影响密合度；铸道直径与根管内气泡无直接关系。","tier":"基础"},{"id":241,"type":"single","stem":"灌注超硬石膏模型时，为减少气泡，正确的操作是","options":["从模型的一侧缓慢注入并振动","将石膏浆从高处快速倾倒","先灌注牙尖区再灌注底座","调拌时加入更多水分提高流动性"],"answer":[0],"explanation":"从一侧缓慢注入并配合振动可使石膏浆逐步推进排出空气；高处快速倾倒会卷入气泡；先灌牙尖易形成分层气泡；多加水分会降低强度和精度。","tier":"进阶"},{"id":242,"type":"single","stem":"可摘局部义齿卡环中，圆环形卡环与杆形卡环在固位作用上的主要区别是","options":["圆环形卡环固位力更小","杆形卡环对基牙扭力更小","圆环形卡环只能用于前牙","杆形卡环不能用于游离缺失"],"answer":[1],"explanation":"杆形卡环从龈方进入倒凹，对基牙产生的扭力较小；圆环形卡环固位力通常较大而非更小；圆环形卡环前后牙均可用；杆形卡环常用于游离缺失。","tier":"进阶"},{"id":243,"type":"single","stem":"某患者下颌肯氏I类缺失，设计可摘局部义齿时，为减小游离端基托对基牙的扭力，较合理的做法是","options":["采用刚性连接的大连接体","设计应力中断式连接","增加卡环数量提高固位","将基托边缘延伸至磨牙后垫之后"],"answer":[1],"explanation":"游离端义齿受力有下沉趋势，应力中断式连接可减少对基牙的扭力；刚性连接会把扭力传给基牙；增加卡环不改变游离端下沉引起的扭力；基托过度后延会压迫软组织。","tier":"挑战"},{"id":244,"type":"single","stem":"金瓷修复体中，金属与瓷热膨胀系数不匹配时，最可能出现的缺陷是","options":["瓷层表面着色","瓷层剥脱或龟裂","金属基底变形","金瓷结合界面形成气泡"],"answer":[1],"explanation":"金瓷热膨胀系数不匹配会在冷却过程中产生残余应力，导致瓷层剥脱或龟裂；着色与色素及烧结气氛有关；金属变形与厚度和操作有关；界面气泡与排气及污染有关。","tier":"进阶"},{"id":245,"type":"single","stem":"制作全口义齿个别托盘时，托盘边缘应比功能整塑后的印模边缘短约","options":["0.5mm","1mm","2～3mm","5～6mm"],"answer":[2],"explanation":"个别托盘边缘一般比最终功能印模边缘短2～3mm，为印模材料留出空间；0.5～1mm过短不足，5～6mm过长会造成材料溢出过多、边缘形态不准。","tier":"基础"},{"id":246,"type":"single","stem":"制作钴铬合金铸造支架时，下列哪种做法最符合模型准备的要求","options":["在石膏模型表面涂布一薄层分离剂后再复制耐火模型","对工作模型上的倒凹不做任何填塞直接复制耐火模型","用蜡填塞工作模型倒凹后直接在其上熔模铸造","对工作模型只填塞硬区倒凹而软组织倒凹保留"],"answer":[0],"explanation":"知识点：铸造支架模型准备中分离剂与倒凹填塞。正确项对：在石膏模型表面涂布分离剂可防止复制耐火模型时石膏与印模材粘连。错误项：不填倒凹会使支架就位困难；直接在石膏工作模型上熔模铸造不符合工艺，工作模型不用于直接铸造；只填硬区倒凹而保留软组织倒凹仍会形成就位阻碍，软组织倒凹也需按设计处理。","tier":"进阶"},{"id":247,"type":"single","stem":"可摘局部义齿支架设计中，关于支托凹预备的说法哪项正确","options":["支托凹底与基牙长轴应形成一定角度以利传递力量","支托凹底应预备成与基牙长轴平行的平面","支托凹应尽量加深以增加支托强度","支托凹边缘应预备成锐角以增强卡抱"],"answer":[0],"explanation":"知识点：支托凹预备角度。正确项对：支托凹底与基牙长轴形成适当角度，使咬合力沿基牙长轴方向传递。错误项：与长轴平行的平面不利于力沿长轴传递；过深会削弱基牙强度；锐角边缘易造成应力集中且不利于清洁。","tier":"进阶"},{"id":248,"type":"single","stem":"制作金属烤瓷修复体时，金瓷结合界面出现气泡，最可能的原因是","options":["金属基底表面打磨后未彻底清洁残留油污","瓷粉堆塑时振动时间过长","烧结温度低于瓷粉推荐温度","金属基底喷砂后放置时间过短"],"answer":[0],"explanation":"知识点：金瓷结合界面气泡成因。正确项对：金属表面残留油污或杂质在烧结时产生气体形成气泡。错误项：振动过长主要影响瓷层致密度而非界面气泡；温度偏低影响瓷熔融而非产气；喷砂后放置时间短不是气泡主因。","tier":"进阶"},{"id":249,"type":"single","stem":"患者戴用新制作的可摘局部义齿一周后复诊，主诉咀嚼时义齿翘动，检查发现游离端基托下沉，最可能的设计缺陷是","options":["游离端未设计间接固位体或未取功能印模","卡环数目过多导致就位困难","基托边缘伸展过长压迫黏膜","人工牙排列偏颊侧形成杠杆"],"answer":[0],"explanation":"知识点：游离端义齿下沉的常见设计原因。正确项对：游离端缺失需取功能印模并设计间接固位体以对抗下沉翘动。错误项：卡环过多主要影响就位；边缘过长引起压痛而非翘动；牙排列偏颊主要影响稳定与美观。","tier":"挑战"},{"id":250,"type":"single","stem":"关于磷酸盐包埋材料在铸造中的应用，下列哪项描述正确","options":["磷酸盐包埋材料适用于高熔合金的铸造","磷酸盐包埋材料的热膨胀主要靠石英的晶型转变","磷酸盐包埋材料调拌后应放置过夜再焙烧","磷酸盐包埋材料只能用自来水调拌"],"answer":[0],"explanation":"知识点：磷酸盐包埋材料特性。正确项对：其耐火度高，适用于高熔合金铸造。错误项：热膨胀主要来自石英晶型转变与磷酸盐结合剂反应共同作用，单说石英不准确；调拌后应按要求时间凝固后焙烧，并非过夜；应使用专用液或蒸馏水控制膨胀，自来水不适宜。","tier":"进阶"},{"id":251,"type":"single","stem":"在制作全口义齿时，关于基托蜡型的边缘处理，下列哪项操作正确","options":["基托边缘应圆钝并与黏膜转折处密合","基托边缘应做成锐利薄边以利就位","基托边缘应超出黏膜转折处2mm","基托边缘应远离黏膜转折处1mm"],"answer":[0],"explanation":"知识点：全口义齿基托边缘形态。正确项对：圆钝边缘与黏膜转折密合可形成良好封闭。错误项：锐利薄边易变形且刺激黏膜；超出转折处会压迫黏膜；远离转折处则破坏边缘封闭。","tier":"进阶"},{"id":252,"type":"single","stem":"关于嵌体蜡型制作中蜡的收缩，下列哪种做法可减少其影响","options":["分段添加蜡并逐段冷却后再加下一段","一次性堆满蜡后自然冷却","蜡型完成后立即放入冷水中急冷","用热蜡反复烫平表面直至完全光滑"],"answer":[0],"explanation":"知识点：蜡型收缩控制。正确项对：分段添加并逐段冷却可减小整体收缩。错误项：一次堆满冷却收缩大；急冷易造成变形；反复烫平会引入新收缩与变形。","tier":"进阶"},{"id":253,"type":"single","stem":"某技师在铸造钴铬合金支架时，铸道设计过细且方向单一，最可能导致","options":["铸造不全或铸件局部缺陷","铸件表面粗糙度增加","铸件硬度显著提高","铸件热膨胀系数改变"],"answer":[0],"explanation":"知识点：铸道设计对铸造质量的影响。正确项对：铸道过细、方向单一时熔金流动性不足，易造成铸造不全。错误项：表面粗糙与包埋材料及温度有关；硬度和热膨胀系数不因铸道设计直接改变。","tier":"进阶"},{"id":254,"type":"single","stem":"关于全口义齿的选磨，下列哪项原则正确","options":["先磨除正中𬌗的早接触再调侧方𬌗","先调侧方𬌗再调正中𬌗","只调侧方𬌗不必调正中𬌗","调磨时只磨上颌牙不磨下颌牙"],"answer":[0],"explanation":"知识点：全口义齿选磨顺序。正确项对：应先消除正中𬌗早接触，再调侧方与前伸𬌗。错误项：顺序颠倒会破坏已建立的𬌗关系；只调侧方会遗留正中干扰；只磨单颌不利于建立平衡𬌗。","tier":"基础"},{"id":255,"type":"single","stem":"制作钴铬合金铸造支架时，模型设计上若将大连接体下的石膏倒凹完全填除，最可能造成的后果是","options":["支架就位后与黏膜间形成明显间隙","支架无法进入倒凹区而无法就位","支架在口内出现翘动和摆动","基牙受到侧向力后发生移位"],"answer":[0],"explanation":"知识点：铸造支架大连接体与组织面的贴合关系。正确项：大连接体下倒凹被完全填除后，支架组织面与黏膜之间会形成空隙，导致食物滞留和不适。错误项：倒凹填除不影响支架就位道，故不会无法就位；翘动多因支托或卡环设计不当；基牙移位与连接体贴合度无直接关系。","tier":"进阶"},{"id":256,"type":"single","stem":"在可摘局部义齿的模型观测中，将模型向后倾斜的主要目的是","options":["增加基牙近中倒凹的深度","使基牙远中面倒凹加大","减小基牙颊侧倒凹的深度","使义齿就位道与脱位道一致"],"answer":[1],"explanation":"知识点：模型观测与就位道选择。正确项：模型向后倾斜可使基牙远中面倒凹加大，便于设置对抗臂。错误项：向后倾斜使近中倒凹减小而非增加；颊侧倒凹变化与倾斜方向关系不符；就位道与脱位道一致是卡环设计原则，不是倾斜目的。","tier":"进阶"},{"id":257,"type":"single","stem":"铸造全冠蜡型制作时，邻面接触区加蜡过多且未修整，铸造后最可能出现的问题是","options":["邻接过紧导致邻牙移位","邻接区开放造成食物嵌塞","邻接过紧引起邻牙疼痛","邻接区形态过平易积食物"],"answer":[0],"explanation":"知识点：全冠邻面接触区的蜡型控制。正确项：邻面加蜡过多会使铸造后邻接过紧，推挤邻牙。错误项：邻接开放由加蜡不足引起；邻牙疼痛多因接触过紧压迫牙周膜，但题干问最可能的结构问题；邻接区过平与加蜡过多无直接因果。","tier":"进阶"},{"id":258,"type":"single","stem":"制作热凝树脂基托时，若填塞期树脂过多，最可能造成的后果是","options":["基托内出现气泡","基托边缘出现飞边","基托厚度不足","基托颜色不均"],"answer":[1],"explanation":"知识点：热凝树脂填塞期与型盒压制。正确项：树脂过多会在加压时从型盒间隙溢出形成飞边。错误项：气泡多因树脂不足或压力不够；厚度不足因树脂量不够；颜色不均与填塞量无直接关系。","tier":"基础"},{"id":259,"type":"single","stem":"在制作金属烤瓷冠时，金属基底冠表面喷砂处理的主要作用是","options":["增加金属与瓷的化学结合","提高金属表面粗糙度以利机械嵌合","消除金属表面的铸造缺陷","降低金属的热膨胀系数"],"answer":[1],"explanation":"知识点：金瓷结合机制。正确项：喷砂使金属表面粗糙，增大与瓷的机械嵌合面积。错误项：化学结合靠氧化层；喷砂不能消除内部铸造缺陷；喷砂不改变材料热膨胀系数。","tier":"基础"},{"id":260,"type":"single","stem":"患者戴用全口义齿后主诉说话时义齿易脱落，检查发现义齿基托边缘在系带区未形成切迹，正确的处理是","options":["磨短基托边缘以避开系带","缓冲系带区基托边缘形成切迹","加厚基托边缘增加封闭","重衬基托组织面提高吸附力"],"answer":[1],"explanation":"知识点：全口义齿基托边缘与系带区的关系。正确项：系带区应形成切迹，避免功能运动时义齿被推脱。错误项：单纯磨短边缘会破坏边缘封闭；加厚边缘会加重推脱；重衬不能解决系带区形态问题。","tier":"挑战"},{"id":261,"type":"single","stem":"光固化复合树脂修复前牙时，酸蚀后冲洗吹干，牙面应呈现的外观是","options":["白垩色均匀表面","透明光滑表面","黄色粗糙表面","灰暗湿润表面"],"answer":[0],"explanation":"知识点：牙釉质酸蚀后的临床判断。正确项：酸蚀后釉质呈白垩色均匀外观，表明酸蚀有效。错误项：透明光滑说明酸蚀不足；黄色粗糙非酸蚀特征；灰暗湿润提示未吹干或酸蚀不足。","tier":"进阶"},{"id":262,"type":"single","stem":"在制作可摘局部义齿时，选择双重大连接体而非单一大连接体的主要原因是","options":["患者对美观要求高","前牙区有较大倒凹","后牙区缺隙过长","对侧基牙条件差"],"answer":[1],"explanation":"知识点：大连接体的选择。正确项：前牙区倒凹大时，单一大连接体难以避开倒凹，需用双重大连接体。错误项：美观、缺隙长度、对侧基牙条件不是选择双重大连接体的决定因素。","tier":"进阶"},{"id":263,"type":"single","stem":"铸件在铸造后冷却方式选择不当，若采用急冷，最可能导致","options":["铸件表面粗糙","铸件内部产生缩孔","铸件发生变形","铸件出现裂纹"],"answer":[3],"explanation":"知识点：铸造后冷却与铸件缺陷。正确项：急冷会使铸件产生较大内应力，易导致裂纹。错误项：表面粗糙与包埋材料有关；缩孔与铸造收缩补偿有关；变形多与冷却不均或操作有关，但裂纹是急冷最典型后果。","tier":"基础"},{"id":264,"type":"single","stem":"某技师在制作全口义齿时，发现下颌模型舌侧翼缘区倒凹较大，正确的处理方式是","options":["直接在此区加压形成基托","填除倒凹后常规制作基托","磨除模型对应区域石膏","在该区基托边缘加厚"],"answer":[1],"explanation":"知识点：全口义齿舌侧翼缘区倒凹处理。正确项：填除倒凹可避免义齿就位困难和组织压痛。错误项：直接加压会导致压痛；磨除模型石膏破坏模型准确性；加厚边缘加重压迫。","tier":"挑战"},{"id":265,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要预留的铸道口位置通常应设置在支架的哪一部位，以便金属液顺利充满铸型？","options":["义齿基托最厚处","网状结构中央","上腭后缘区","支架蜡型最高点"],"answer":[0],"explanation":"知识点：铸造支架铸道设置原则。铸道应设在蜡型最厚、金属液最后凝固的部位，使金属液在凝固前充满铸型，因此选义齿基托最厚处。网状结构中央过薄，金属液易过早凝固；上腭后缘区较薄且远离主要受力区；支架蜡型最高点并非储热集中区，容易造成缩孔。","tier":"进阶"},{"id":266,"type":"single","stem":"在可摘局部义齿中，设计颌支托的主要目的与下列哪项功能最为相关？","options":["防止义齿下沉并传递咬合力","恢复缺失牙的邻接关系","增强基托与黏膜的吸附力","改善人工牙的色泽匹配"],"answer":[0],"explanation":"知识点：颌支托的作用。颌支托放在支托凹内，主要功能是支撑义齿、防止下沉并将咬合力传导至基牙。恢复邻接关系由人工牙或邻面板完成；增强吸附力与基托边缘和黏膜密合有关；人工牙色泽与支托无关。","tier":"进阶"},{"id":267,"type":"single","stem":"某技师在制作全口义齿时，发现上颌蜡型后堤区边缘过长，伸入软腭颤动线后方较多。该做法最可能造成的问题是？","options":["义齿基托边缘压迫软腭引起恶心","义齿固位力明显增强","义齿咬合垂直距离降低","义齿基托与黏膜之间产生吸附力"],"answer":[0],"explanation":"情境案例：全口义齿后堤区伸展过度。后堤区越过颤动线过多会压迫软腭，引发恶心和不适。固位力不会因此增强而是受损；垂直距离由颌位关系决定，与后堤边缘无关；吸附力依靠边缘封闭，过长反而破坏封闭。","tier":"挑战"},{"id":268,"type":"single","stem":"使用石膏模型制作耐火模型时，模型表面涂布分离剂的主要作用是？","options":["防止铸造时金属液与模型粘连","降低模型表面粗糙度","提高石膏模型的抗压强度","加快石膏的凝固速度"],"answer":[0],"explanation":"知识点：耐火模型分离剂的作用。分离剂在模型表面形成隔离层，防止熔融金属与模型材料粘连，便于铸件取出。降低粗糙度靠打磨；抗压强度由石膏配比决定；凝固速度与分离剂无关。","tier":"基础"},{"id":269,"type":"single","stem":"对钴铬合金铸造支架进行电解抛光时，若电流密度过大，最可能出现的后果是？","options":["支架表面出现点状腐蚀或麻点","支架表面光洁度显著提高","支架金属内部晶粒细化","支架弹性模量降低"],"answer":[0],"explanation":"知识点：电解抛光参数控制。电流密度过大时局部电流集中，产生点蚀或麻点，影响表面质量。光洁度不会提高而是恶化；晶粒细化和弹性模量属材料内部性质，电解抛光只作用于表面。","tier":"进阶"},{"id":270,"type":"single","stem":"在制作金属烤瓷冠时，基底冠金瓷结合界面处出现气泡，最可能的原因是？","options":["基底冠表面喷砂后残留油污","烤瓷炉升温速度过慢","瓷粉与蒸馏水比例中水偏多","基底冠金属厚度大于0.5毫米"],"answer":[0],"explanation":"知识点：金瓷结合界面气泡成因。喷砂后油污未清洁干净，烧结时有机物气化形成气泡。升温过慢一般不会产气；水偏多可能影响瓷浆稠度但气泡主因是污染；基底冠厚度与气泡无直接因果。","tier":"进阶"},{"id":271,"type":"single","stem":"一位患者戴用可摘局部义齿后主诉咀嚼时基牙酸痛，检查发现卡环臂进入倒凹过深。正确的处置思路是？","options":["调整卡环臂位置使进入倒凹深度符合设计要求","加高基托边缘以分散咬合力","磨除基牙对应倒凹区牙体组织","增加人工牙数量以平衡咬合"],"answer":[0],"explanation":"情境案例：卡环倒凹深度不当导致基牙酸痛。卡环臂进入倒凹过深会对基牙产生过大侧向力，应调整卡环位置至设计深度。加高基托不能解决卡环问题；磨除基牙组织属不可逆损伤；增加人工牙与基牙酸痛无关。","tier":"挑战"},{"id":272,"type":"single","stem":"在焊接义齿支架断裂处时，为防止焊接变形，最常采用的措施是？","options":["先将支架断端准确复位并固定后再焊接","将支架加热至通红后自然冷却","在断裂处直接堆焊不加固定","用冷水快速冷却焊接区"],"answer":[0],"explanation":"知识点：支架焊接防变形。焊接前必须复位固定，保证焊接后位置准确。加热通红后自然冷却会导致变形和性能下降；直接堆焊无法保证对位；冷水急冷会产生应力和裂纹。","tier":"进阶"},{"id":273,"type":"single","stem":"某技师在制作嵌体蜡型时，发现蜡型边缘与洞缘之间存在微小缝隙。最恰当的处理方式是？","options":["用热蜡刀将边缘蜡重新熔合封闭","直接包埋，缝隙在铸造后自然消失","用石膏填补缝隙后再包埋","将蜡型整体取下重新制作"],"answer":[0],"explanation":"情境案例：嵌体蜡型边缘缺陷处理。边缘缝隙会导致铸件边缘不密合，应用热蜡刀熔合封闭。直接包埋会复制缺陷；石膏填补无法与蜡结合；整体重做虽可行但非最恰当的首选处理。","tier":"挑战"},{"id":274,"type":"single","stem":"下列哪项因素最直接影响全口义齿基托与模型之间的密合度？","options":["基托材料的聚合收缩","人工牙的耐磨性","患者的唾液黏稠度","义齿的咬合接触点数量"],"answer":[0],"explanation":"知识点：基托密合度影响因素。基托材料聚合时收缩会导致基托与模型间出现间隙，直接影响密合度。人工牙耐磨性、唾液黏稠度、咬合接触点数均不决定基托与模型的密合程度。","tier":"进阶"},{"id":275,"type":"multi","stem":"制作可摘局部义齿铸造支架时，下列哪些措施有助于减少铸件内部气孔的产生？","options":["适当提高铸造温度使金属液流动性良好","在蜡型上设置足够粗的排气道","包埋前对蜡型表面进行充分脱脂","铸造时采用较大的铸造压力","铸型焙烧后立即进行浇注"],"answer":[0,1,3],"explanation":"知识点：减少铸造气孔的措施。适当提高铸造温度、设置排气道、采用较大铸造压力均有助于减少气孔。包埋前对蜡型表面脱脂主要防表面缺陷，与内部气孔关系较小；铸型焙烧后需按规定冷却至合适温度再浇注，立即浇注可能因温度过高产生气孔或组织粗大。","tier":"挑战"},{"id":276,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要预先留出支架覆盖区域与口腔黏膜之间的缓冲间隙，该间隙通常设置在","options":["模型工作区表面应均匀刮除约0.5mm蜡层","模型工作区表面应涂布一薄层分离剂即可","模型工作区表面应粘贴一层厚度约0.3mm的蜡片","模型工作区表面应保留原石膏面不做任何处理"],"answer":[2],"explanation":"知识点：可摘局部义齿铸造支架的缓冲间隙。正确项0.3mm蜡片是临床常用缓冲厚度，既保证支架就位又不压迫黏膜。错误项0.5mm刮除过厚会导致支架与黏膜不贴合；涂分离剂不能形成有效间隙；保留原石膏面则无缓冲会压迫黏膜。","tier":"挑战"},{"id":277,"type":"single","stem":"在制作全口义齿时，确定垂直距离最常用的临床方法是","options":["拔牙前记录咬合关系再转移至模型","利用息止颌间隙减去2~3mm来确定","让患者在最大开口位时测量上下颌距离","根据患者面下三分之一长度直接推算"],"answer":[1],"explanation":"知识点：全口义齿垂直距离确定方法。正确项利用息止颌间隙减去2~3mm是经典方法。错误项拔牙前记录适用于个别牙缺失；最大开口位测量的是开口度而非垂直距离；面下三分之一推算仅为参考辅助手段，不能直接确定。","tier":"进阶"},{"id":278,"type":"single","stem":"某技师在铸造纯钛支架时发现铸件表面出现大量气孔，经查熔炼室真空度未达到设定值，其最可能的直接原因是","options":["铸型温度低于纯钛熔点导致充填不足","钛液在熔炼过程中与残余气体反应","铸造压力过大使钛液产生湍流","坩埚内壁涂层与钛液发生化学反应"],"answer":[1],"explanation":"知识点：纯钛铸造缺陷与真空度关系。正确项真空度不足时残余气体与高温钛液反应产生气孔。错误项铸型温度低主要导致充填不全而非气孔；压力过大造成湍流不属于气孔主因；坩埚涂层反应会产生夹杂而非典型气孔。","tier":"挑战"},{"id":279,"type":"single","stem":"某患者戴用可摘局部义齿一周后复诊，主诉咀嚼时义齿翘动，检查发现支架末端基牙上的支托与支托窝不贴合，最可能的原因是","options":["支托窝预备过深导致支托悬空","模型在制作过程中发生磨损","支架铸造时收缩未补偿","支托窝预备位置偏向颊侧"],"answer":[2],"explanation":"知识点：铸造支架收缩补偿与支托贴合。正确项铸造收缩未补偿会使支托尺寸偏小、与支托窝不贴合。错误项支托窝过深通常表现为支托就位不够而非翘动；模型磨损影响整体密合度但少见单纯支托不贴；位置偏颊侧主要影响受力方向而非贴合。","tier":"挑战"},{"id":280,"type":"single","stem":"制作烤瓷熔附金属冠时，金属基底冠的金瓷结合面在堆瓷前应进行的处理是","options":["用砂纸打磨后直接堆瓷","喷砂后用超声清洗再行除气预氧化","酸蚀后涂布粘接剂再堆瓷","抛光后涂分离剂再堆瓷"],"answer":[1],"explanation":"知识点：金瓷结合前的基底冠处理。正确项喷砂、超声清洗、除气预氧化是标准流程，可去除污染并形成氧化层。错误项打磨后直接堆瓷无法清洁表面；酸蚀涂粘接剂为树脂粘接思路不适用于金瓷结合；抛光涂分离剂会阻碍金瓷结合。","tier":"进阶"},{"id":281,"type":"single","stem":"某技师在制作弹性义齿时，采用热凝树脂充填后放入水浴中加热，若升温速度过快最可能导致","options":["基托内产生气泡","基托颜色变浅","义齿变形量减小","基托与人工牙结合增强"],"answer":[0],"explanation":"知识点：热凝树脂聚合与升温速度。正确项升温过快会使单体剧烈气化产生气泡。错误项颜色变浅与升温速度无直接关系；变形量应增大而非减小；结合增强不是升温过快的结果，反而可能因气泡降低结合。","tier":"进阶"},{"id":282,"type":"single","stem":"在焊接钴铬合金支架时，为防止焊接区氧化，通常采取的措施是","options":["在空气中快速焊接减少受热时间","使用焊剂并配合还原性火焰","提高焊接温度使氧化层分解","焊接后立即投入冷水中冷却"],"answer":[1],"explanation":"知识点：钴铬合金焊接防氧化。正确项使用焊剂并配合还原性火焰可有效防止氧化。错误项空气中快速焊接仍会氧化；提高温度反而加重氧化；焊后立即冷水冷却易产生变形和裂纹。","tier":"进阶"},{"id":283,"type":"single","stem":"某患者全口义齿戴用后出现下颌义齿固位差，检查发现下颌牙槽嵴低平，技师在重衬时最适合选用的材料是","options":["热凝甲基丙烯酸甲酯","自凝甲基丙烯酸甲酯","硅橡胶类软衬材料","光固化复合树脂"],"answer":[2],"explanation":"知识点：低平牙槽嵴全口义齿重衬材料选择。正确项硅橡胶类软衬材料具有弹性，可缓冲并改善低平牙槽嵴的固位。错误项热凝和自凝树脂均为硬衬，对低平嵴缓冲不足；光固化复合树脂不用于义齿基托重衬。","tier":"挑战"},{"id":284,"type":"single","stem":"某技师在制作可摘局部义齿时，发现模型上设计的大连接体跨越了腭中缝，为减少对腭中缝的覆盖，正确的处理是","options":["将大连接体厚度减薄以减轻重量","将大连接体后缘避开腭中缝区域","将大连接体前缘越过腭中缝","将大连接体改为左右两段分别连接"],"answer":[3],"explanation":"知识点：大连接体越过腭中缝的处理。正确项将大连接体改为左右两段分别连接可避免覆盖腭中缝。错误项减薄厚度不能解决覆盖问题；后缘避开仍可能覆盖；前缘越过会覆盖更多区域。","tier":"挑战"},{"id":285,"type":"multi","stem":"在制作全口义齿时，下列哪些措施有助于提高下颌义齿的固位力","options":["适当延伸基托边缘至黏膜转折处","获得良好的边缘封闭","减小基托与黏膜的接触面积","合理排牙使合力位于中性区","降低咬合垂直距离以增加贴合"],"answer":[0,1,3],"explanation":"知识点：全口义齿固位影响因素。正确项适当延伸边缘、良好边缘封闭、合理排牙位于中性区均可提高固位。错误项减小接触面积会降低吸附力；降低垂直距离会导致咬合关系异常且不增加固位。","tier":"挑战"},{"id":286,"type":"single","stem":"制作钴铬合金铸造支架时，模型上需要先填补倒凹，下列哪种倒凹通常应当保留而不作填补","options":["基牙颊侧颈部的倒凹","基牙舌侧颈部的倒凹","卡环尖进入的倒凹","大连接体下方的组织倒凹"],"answer":[2],"explanation":"知识点为可摘局部义齿支架设计中的倒凹处理。卡环尖需要进入基牙倒凹区才能获得固位，因此该倒凹应保留；基牙颊舌侧颈部倒凹若不在卡环臂走行区通常需填补以免影响就位；大连接体下方组织倒凹需缓冲或填补以避免压伤黏膜。","tier":"挑战"},{"id":287,"type":"single","stem":"某技师在制作全口义齿时发现上颌石膏模型腭部出现气泡缺损，最恰当的处理方式是","options":["用蜡填补气泡后直接排牙","将气泡处刮成倒凹再涂分离剂","重新灌注该模型后再继续制作","用磷酸锌粘固剂修补气泡区域"],"answer":[2],"explanation":"知识点为模型缺陷对义齿基托贴合的影响。腭部气泡会造成基托组织面凸起或穿孔，影响吸附和佩戴，应重新灌注模型；蜡填补会在基托内形成对应凸起；刮成倒凹会使基托形成凸点；磷酸锌粘固剂固化后硬度和稳定性不适合作为模型修补材料。","tier":"挑战"},{"id":288,"type":"single","stem":"熔模铸造中，磷酸盐包埋材料调拌时使用真空搅拌的主要目的是","options":["提高包埋材料的凝固膨胀率","减少包埋材料中的气泡","延长包埋材料的操作时间","降低包埋材料的固化温度"],"answer":[1],"explanation":"知识点为包埋材料调拌工艺。真空搅拌通过抽真空去除浆料中的气泡，使铸型更致密、铸件表面更光滑；凝固膨胀率主要由材料粉液比和成分决定；操作时间由材料体系和粉液比决定；固化温度由化学反应决定，与真空搅拌无关。","tier":"进阶"},{"id":289,"type":"single","stem":"在全口义齿排牙中，上前牙排列时切缘应位于","options":["与下前牙切缘完全对齐","略向唇侧超出下前牙切缘","与下前牙切缘形成浅覆浅覆盖","位于下前牙切缘的舌侧"],"answer":[2],"explanation":"知识点为全口义齿前牙排列的覆覆盖关系。正常应形成浅覆浅覆盖，有利于前伸运动时后牙脱离接触；完全对齐会形成对刃，前伸时产生干扰；过于唇侧会形成深覆盖影响美观和功能；位于舌侧则形成反覆盖，破坏正常咬合关系。","tier":"进阶"},{"id":290,"type":"single","stem":"某患者需要制作金属烤瓷冠，技师在金属基底冠表面进行喷砂处理，该步骤的主要作用是","options":["增加金属表面的粗糙度以提高金瓷结合","去除金属表面的氧化膜以提高润湿性","使金属表面形成压应力以提高强度","封闭金属表面的微孔以防止腐蚀"],"answer":[0],"explanation":"知识点为金瓷结合机制。喷砂使金属表面粗糙化，增加瓷与金属的机械嵌合面积，提高结合强度；氧化膜需在烤瓷前通过预氧化形成而非去除；喷砂不会形成压应力；封闭微孔不是喷砂目的，且喷砂反而使表面粗糙。","tier":"挑战"},{"id":291,"type":"single","stem":"在可摘局部义齿设计中，当基牙牙冠较短且倒凹较浅时，为提高固位力可采取的措施是","options":["增大卡环臂的直径","减小卡环臂的横截面尺寸","将卡环尖置于更深的倒凹区","增加卡环臂的长度"],"answer":[2],"explanation":"知识点为卡环固位力的调节因素。倒凹深度是决定固位力的关键，倒凹浅时可适当加深卡环尖进入倒凹的深度以增加固位；增大卡环臂直径会降低弹性使取戴困难；减小横截面虽增加弹性但会降低卡环强度；增加卡环臂长度会改变固位力分布，不是针对浅倒凹的首选。","tier":"进阶"},{"id":292,"type":"single","stem":"某技师在制作瓷贴面时，对铸瓷贴面进行氢氟酸酸蚀后，下一步正确的处理是","options":["直接用清水冲洗后吹干","用磷酸酸蚀后涂布硅烷偶联剂","用清水冲洗后涂布硅烷偶联剂","用酒精擦拭后直接粘接"],"answer":[2],"explanation":"知识点为瓷贴面粘接前处理。氢氟酸酸蚀铸瓷后需彻底冲洗去除残留酸，再涂布硅烷偶联剂以促进树脂粘接；直接用清水冲洗后吹干缺少硅烷化步骤；磷酸不适用于瓷表面处理且会残留；酒精擦拭不能实现化学偶联。","tier":"进阶"},{"id":293,"type":"single","stem":"制作全口义齿时，技师在石膏模型上铺蜡基托后，发现蜡基托边缘在上颌后堤区处过厚，可能引起的临床问题是","options":["义齿基托边缘封闭增强","患者发音清晰度提高","后堤区压迫黏膜导致疼痛","义齿固位力显著增加"],"answer":[2],"explanation":"知识点为全口义齿基托边缘形态与后堤区的关系。后堤区基托边缘过厚会压迫该区黏膜，引起疼痛和不适；边缘封闭需要适当的边缘形态而非过厚；发音主要受前牙区和腭部形态影响；固位力不会因边缘过厚而增加，反而可能破坏封闭。","tier":"挑战"},{"id":294,"type":"single","stem":"某技师在焊接钴铬合金支架时，发现焊接处出现气孔，下列哪项操作最可能导致该缺陷","options":["焊接前对焊接面进行了喷砂处理","焊接时使用了过多的焊媒","焊接火焰采用了还原焰","焊接前将支架预热至适当温度"],"answer":[1],"explanation":"知识点为支架焊接缺陷的原因。焊媒过多会在高温下分解产生气体，残留在焊缝中形成气孔；喷砂清洁焊接面有利于焊接质量；还原焰可减少氧化；适当预热有利于焊料流动，均不会导致气孔。","tier":"挑战"},{"id":295,"type":"single","stem":"某患者全口义齿戴用后出现下颌义齿在说话时频繁脱落，检查发现义齿基托边缘在磨牙后垫区伸展不足，技师应进行的处理是","options":["加长磨牙后垫区基托边缘并形成适当封闭","磨短下颌义齿舌侧基托边缘","降低下颌义齿后牙牙尖高度","增加下颌义齿基托的厚度"],"answer":[0],"explanation":"知识点为下颌全口义齿磨牙后垫区的边缘封闭。磨牙后垫区基托边缘伸展不足会破坏后缘封闭导致义齿脱落，应加长并形成适当封闭；磨短舌侧边缘会进一步降低封闭；降低牙尖高度影响咀嚼效率；增加基托厚度不解决边缘封闭问题。","tier":"挑战"},{"id":296,"type":"single","stem":"某技师在制作金属烤瓷冠时，发现烤瓷后金属基底冠与瓷层之间出现裂纹，检查发现金属基底冠的瓷覆盖区厚度不足，最可能的原因是","options":["金属基底冠的瓷覆盖区厚度小于0.3mm","金属基底冠的瓷覆盖区厚度大于0.5mm","金属基底冠的瓷覆盖区表面过于粗糙","金属基底冠的瓷覆盖区进行了喷砂处理"],"answer":[0],"explanation":"知识点为金瓷冠金属基底冠的厚度要求。瓷覆盖区金属厚度不足时，金属在烤瓷高温下易变形，导致瓷层开裂；厚度大于0.5mm虽不理想但不是裂纹直接原因；表面粗糙和喷砂有利于结合，不会导致裂纹。","tier":"挑战"},{"id":297,"type":"single","stem":"制作钴铬合金铸造支架时，熔模在铸造前需进行预热，其主要目的中不包括","options":["使熔模材料充分膨胀以补偿合金收缩","去除熔模内的残余水分和挥发物","提高铸型温度以减少合金熔液与铸型温差","使铸型内表面形成氧化层以利于合金流动"],"answer":[3],"explanation":"知识点：钴铬合金铸造支架熔模预热的作用。预热可使熔模膨胀补偿合金冷却收缩（A对）、去除残余水分和挥发物防止气孔（B对）、提高铸型温度减少温差避免浇不足（C对）。铸型内表面形成氧化层并非预热目的，氧化层反而可能影响铸件表面质量（D错）。","tier":"挑战"},{"id":298,"type":"single","stem":"全口义齿排牙时，上颌第一磨牙的牙长轴近远中向倾斜方向应为","options":["近中面向近中倾斜","近中面向远中倾斜","牙长轴与牙合平面垂直","远中面向近中倾斜"],"answer":[1],"explanation":"知识点：全口义齿排牙的上颌第一磨牙倾斜规律。上颌第一磨牙近中面向近中倾斜有利于形成合适的牙合曲线和咬合关系（A错）。上颌第一磨牙近中面向远中倾斜，即牙长轴颈部偏远中、牙合面向近中倾斜，符合全口义齿排牙的补偿曲线要求（B对）。牙长轴与牙合平面垂直不符合上颌磨牙的生理倾斜（C错）。远中面向近中倾斜方向相反，会导致咬合关系异常（D错）。","tier":"进阶"},{"id":299,"type":"single","stem":"某技师在制作PFM冠时，烤瓷炉显示的温度与实测温度存在偏差，导致瓷层出现气泡和颜色偏暗。在排除瓷粉本身问题后，最恰当的下一步处置是","options":["延长真空释放时间再重新烧结","提高烧结温度上限重新烧结","对烤瓷炉进行温度校准后再烧结","更换烤瓷炉内衬后重新烧结"],"answer":[2],"explanation":"知识点：烤瓷炉温度偏差对瓷层质量的影响及处置。温度偏差导致烧结不足或过烧，出现气泡、颜色异常（C对）。延长真空释放时间不能解决温度偏差问题（A错）。盲目提高温度上限会加重过烧，不能纠正温度偏差（B错）。更换内衬与温度偏差无直接关系（D错）。","tier":"挑战"},{"id":300,"type":"multi","stem":"某技师制作钴铬合金烤瓷熔附金属全冠，在金属基底冠试戴合适、表面处理后进行瓷层堆塑，下列操作中符合钴铬合金烤瓷工艺要求的有哪些？","options":["基底冠表面用50μm氧化铝喷砂后，在950℃真空下预氧化5分钟","在基底冠表面先涂布一层遮色瓷，烧结温度比体瓷高约30℃","体瓷堆塑时用超声器械振动使瓷粉颗粒紧密排列，减少气泡","每层瓷粉堆塑后自然干燥，再放入炉中从室温随炉升温烧结"],"answer":[0,1],"explanation":"知识点：钴铬合金烤瓷熔附金属全冠的金属表面处理与瓷层堆塑工艺。正确项①：钴铬合金烤瓷前需对基底冠喷砂粗化（常用50μm氧化铝）并在约950℃真空预氧化，以形成致密氧化膜、增强金瓷结合，符合工艺要求。正确项②：遮色瓷用于遮盖金属颜色并连接金属与体瓷，其烧结温度通常高于体瓷约20～30℃，先烧结遮色瓷再堆体瓷是标准程序。错误项③：体瓷堆塑应采用毛笔蘸液轻轻填压、振动或轻敲模型使瓷粉致密，而超声器械振动会破坏瓷层结构、带入过多水分，不是正确做法。错误项④：烤瓷烧结应先将瓷粉在炉外自然干燥，再快速放入已升至预热温度的炉中烧结，若从室温随炉升温会导致瓷层干燥收缩不均、产生气泡或裂纹，故该项错误。","tier":"挑战"}]}