牙合龈高度和隙料厚度对计算机辅助设计/计算机辅助制作全锆冠适合性与固位力的影响
Influence of preparation height and cement space on the fit and retention of computer aided design/computer aided manufacturing zirconia crown
作者：席爽, 吴紫潇, 高翠翠, 孟雨晨, 裴丹丹, 逯宜
Author：Xi Shuang, Wu Zixiao, Gao Cuicui, Meng Yuchen, Pei Dandan, Lu Yi
收稿日期：2019-09-12 年卷（期）页码：2020,38(3):263-263-269
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：计算机辅助设计/计算机辅助制作全锆冠,适合性,固位力,牙合龈高度,隙料厚度,
Key words：computer aided design/computer aided manufacturing zirconia crown,fit,retention,preparation height,cement space,
基金项目：“西安交通大学口腔医院陕西省牙颌疾病临床医学研究中心”开放课题资助项目(2018YHJB07)
中文摘要
目的 探讨牙合龈高度和隙料厚度对计算机辅助设计/计算机辅助制作（CAD/CAM）全锆冠适合性与固位力的影响。方法 用3D打印系统制作聚合度为2°,高度在1~3 mm之间的树脂基牙,采集光学印模。在柯乐德CAD/CAM系统中设置隙料厚度分别为10~50 μm,制作全锆冠。用硅橡胶间隙印模法检测每组的适合性,粘接后通过轴向拉伸试验测定其固位力。采用SPSS 22.0软件进行分析。结果 高度一定时,不同隙料厚度组的固位力无明显不同（P>0.05）,适合性有差异（P<0.05）。隙料厚度一定时,不同牙合龈高度组的适合性无明显不同（P>0.05）,固位力有差异（P<0.05）。隙料厚度与牙合龈高度无交互影响（P>0.05）。结论 柯乐德CAD/CAM系统制作的氧化锆全冠,建议预备体高度不低于3 mm,推荐隙料厚度设置为30 μm。
英文摘要
ObjectiveTo investigate the effects of preparation height and cement space on the fit and retention of computer-aided design (CAD)/computer aided manufacturing (CAM) zirconia crown, and to provide reference for the clinical design and fabrication of CAD/CAM crowns.Methods3D printing system was used to fabricate resin abutment teeth with convergence angle of 2° and height of 1-3 mm. The models’ optical impressions were collected by the three-shape scanner. Then, the cement spaces were set by Cradle CAD/CAM system at 10-50 μm to create an all-ceramic zirconia crown. The fit of the crowns was measured by using silicone rubber interstitial impression method. The retention of the crowns was measured by pull-off test with uniaxial tensile force after the crown was bonded. The data were analyzed by SPSS 22.0 software.ResultsWhen the preparation height was fixed, the fitness values of different cement space groups have statistical difference (P<0 .05), whereas the retention values of different cement space groups have no statistical difference (P>0.05). The fitness values of different preparation height groups have no statistical difference (P>0.05), and the retention values of different preparation height groups have statistical difference (P<0 .05) when the cement space was fixed. no interaction was observed between the cement space and the preparation height (P>0.05).ConclusionWhen cradle CAD/CAM system is used to create a full crown in the clinic, the preparation height should be set to more than 3 mm, and the cement space should be set at 30 μm.
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