扫描对象对计算机辅助设计/计算机辅助制造钴铬烤瓷冠精确性影响的研究  

Comparison of accuracies from different scanned objects of Co-Cr metal porcelain crowns fabricated with computer aided design/computer aided manufacture technique

作　　者：赵莹 杨柳[1] 谢宇[1] 张艳[1] 魏溦 李江[1] Zhao Ying;Yang Liu;Xie Yu;Zhang Yan;Wei Wei;Li Jiang(Dept.of Prosthodontics,Hospital of Stomatology,Jilin University,Changchun 130021,China)

机构地区：[1]吉林大学口腔医院修复科,长春130021

出　　处：《国际口腔医学杂志》2018年第6期686-689,共4页International Journal of Stomatology

摘　　要：目的比较不同的扫描对象对计算机辅助设计(CAD)/计算机辅助制造(CAM)钴铬烤瓷冠精确性的影响。方法利用CAD/CAM技术制作15个钴铬烤瓷冠试件,根据不同的扫描对象:预备离体牙、硅橡胶印模和石膏模型,均分为实验B组(B1、B2和B3组),另外使用传统失蜡法铸造5个试件作为对照(A组),采用微计算机断层扫描技术比较边缘(AMD点和MG点)及内部适合性(CA点、AW点、AOT点、OA点)的差异,对结果进行单因素方差分析和配对t检验。结果在边缘适合性上,B组AMD点的数值均明显小于A组(P<0.05),两组在MG点上的差异无统计学意义;在内部适合性上,B组除OA点外的其他位点的测量数值均小于A组,其中AOT、AW、OA点B1、2组与A组的测量差异有统计学意义(P<0.05),B3组与A组的差异无统计学意义(P>0.05);B组与A组CA点的差异均无统计学意义(P>0.05)。结论硅橡胶印模的精确性明显优于预备后的离体牙及石膏模型,CAD/CAM相比传统失蜡铸造技术来说,试件具有更佳的边缘及内部适合性。Objective To evaluate the effects of different scanning objects on the accuracy of computer aided design(CAD)/computer aided manufacture(CAM)Co-Cr metal porcelain crowns.Methods Fifteen Co-Cr metal porcelain crown specimens were fabricated by CAD/CAM technology.According to different scanning objects:prepared teeth,silicone rubber and stone die,they were divided into experimental B groups(group B1,B2,B3).Five specimens of traditional lost wax casting were used as control(group A).Marginal fits(AMD point and MG point)and internal fits(CA point,AW point,AOT point and OA point)were measured by the micro-CT.Statistical analysis was performed via one-way ANOVA and paired-t-test.Results The AMD point’marginal fits of the experimental B groups were smaller than group A(P<0.05),there was no statistic difference in MG point’marginal fits between the experimental B groups and group A.The experimental B groups had smaller internal fits than group A except OA point.The internal fits of group B1,2 were smaller than the group A at AOT,AW and OA points(P<0.05),except group B3(P>0.05).There was no statistic difference in CA point’internal fits between the experimental B groups and group A(P>0.05).Conclusion The accuracy of silicone rubber is higher than the prepared tooth and stone die.Comparing to the traditional casting,the CAD/CAM has better marginal and internal fits.

关 键 词：计算机辅助设计/计算机辅助制造 硅橡胶 微计算机断层扫描技术 边缘及内部适合性 

分 类 号：R783.2[医药卫生—口腔医学]