CAJ | 학술논문

目的：??研究硅橡胶印模扫描、直接光学印模和传统的物理印模对计算机义齿辅助设计与制作全瓷冠边缘适合性的影响。方法??用数控车床制备聚甲基丙烯酸甲酯材质下颌第一磨牙标准全冠预备体16个，采用硅橡胶制取精细印模，超硬石膏灌注翻制成石膏模型。分别采用扫描全冠预备体、硅橡胶印模和石膏模型获取数字化模型，制作48个氧化锆全瓷冠。采用间隙印模测量法评价3组冠的边缘间隙，应用SPSS?17.0软件对实验数据进行统计分析。结果?直接扫描组、硅橡胶印模组、超硬石膏组的全瓷冠边缘间隙测量结果分别为（69.18±9.47）、（81.04±10.88）、（84.42±9.96）μm。直接扫描组与硅橡胶印模组、超硬石膏组差异有统计学意义（P<0.05），硅橡胶印模组与超硬石膏组之间差异无统计学意义（P>0.05）。结论??直接扫描、硅橡胶印模扫描、石膏模型扫描法全瓷冠的边缘适合性均在临床可接受范围之内，硅橡胶印模扫描可作为临床上获取数字模型的方式之一。
목적：??연구규상효인모소묘、직접광학인모화전통적물리인모대계산궤의치보조설계여제작전자관변연괄합성적영향。방법??용수공차상제비취갑기병희산갑지재질하합제일마아표준전관예비체16개，채용규상효제취정세인모，초경석고관주번제성석고모형。분별채용소묘전관예비체、규상효인모화석고모형획취수자화모형，제작48개양화고전자관。채용간극인모측량법평개3조관적변연간극，응용SPSS?17.0연건대실험수거진행통계분석。결과?직접소묘조、규상효인모조、초경석고조적전자관변연간극측량결과분별위（69.18±9.47）、（81.04±10.88）、（84.42±9.96）μm。직접소묘조여규상효인모조、초경석고조차이유통계학의의（P<0.05），규상효인모조여초경석고조지간차이무통계학의의（P>0.05）。결론??직접소묘、규상효인모소묘、석고모형소묘법전자관적변연괄합성균재림상가접수범위지내，규상효인모소묘가작위림상상획취수자모형적방식지일。
Objective??To?investigate?the?effect?of?three?different?impression?methods?on?the?marginal?fit?of?all-ceramic?crowns.?The?three?methods?include?scanning?silicone?rubber?impression,?cast?models,?and?direct?optical?impression. Methods?The?polymethyl?methacrylate?(PMMA)?material?of?a?mandibular?first?molar?in?standard?model?was?prepared?with?16?models?duplicated.?The?all-ceramic?crowns?were?prepared?using?three?different?impression?methods.?Accurate?impressions?were?made?using?silicone?rubber,?and?the?cast?models?were?obtained.?The?PMMA?models,?silicone?rubber?impressions,?and?cast?models?were?scanned,?and?digital?models?of?three?groups?were?obtained?to?produce?48?zirconia?all-ceramic?crowns?with?computer?aided?design/computer?aided?manufacture.?The?marginal?fit?of?these?groups?was?measured?by?silicone?rubber?gap?impression.?Statistical?analysis?was?performed?with?SPSS?17.0?software.?Results??The?marginal?fit?of?direct?optical?impression?groups,?silicone rubber impression groups, cast model groups was (69.18±9.47), (81.04±10.88), (84.42±9.96)μm. A significant diffe-rence?was?observed?in?the?marginal?fit?of?the?direct?optical?impression?groups?and?the?other?groups?(P<0.05).?No?statistically?significant?difference?was?observed?in?the?marginal?fit?of?the?silicone?rubber?impression?groups?and?the?cast?model?groups?(P>0.05).?Conclusion??All?marginal?measurement?sites?are?clinically?acceptable?by?the?three?different?impression?scanning?methods.?The?silicone?rubber?impression?scanning?method?can?be?used?for?all-ceramic?restorations.