CAD/CAM全瓷冠与激光熔覆烤瓷冠边缘适合性的研究  

Comparative study of marginal adaptation of crowns by selective laser melting and CAD/CAM methods

作　　者：翁蓓军 黄伟昊 李国强 

机构地区：[1]上海市口腔病防治院,上海200031

出　　处：《口腔材料器械杂志》2014年第4期185-188,共4页Chinese Journal of Dental Materials and Devices

摘　　要：目的比较CAD/CAM全瓷冠,选择性激光熔覆技术(selective laser melting,SLM)制作的全冠以及传统工艺铸造冠的边缘适合性差异,以期为临床提供参考依据。方法通过切削技术制作铝合金试件,且翻制前磨牙牙备后树脂试件30件,将试件分为SLM组、CAD/CAM组和铸造组(对照组),分别制作钴铬合金全冠以及全瓷冠,在体视显微镜下观察各冠边缘与试件之间的距离。结果 SLM组的边缘间隙为(46.57±3.14)μm,CAD/CAM组为(45.24±2.25)μm,对照组为(68.54±7.57)μm。SLM组与CAD/CAM组的数据差异没有统计学意义(P>0.05),但两者与对照组的数据差异具有统计学意义(P<0.01)。结论 3种方法制作的全冠适合性均在临床可接受的范围内,但采用SLM技术和CAD/CAM技术制得的全瓷冠其边缘适合性更接近美国牙科协会的标准,值得推广应用。Objective The marginal adaptation of crowns fabricated by selective laser melting（SLM） and CAD/CAM methods was investigated to provide an experimental basis for clinic.Methods Co-Cr alloy full crowns fabricated by SLM, Wax-lost-casting and all-ceramic crowns by CAD/CAM were divided into three groups of 10 samples in each group. Distance between each crown’s margin and the abutment was recorded at 50 points randomly using a measuring microscope at a magnification of ×100. The results were analyzed with one-way ANOVA and Tukey’s multiple comparison test at a significance level of 0.05. Results The gap between SLM crowns and the abutments was（46.57±3.14） μm,（45.24±2.25）μm for CAD/CAM crowns and（68.54±7.57） μm for wax-lost-casting crowns.There were no significant difference between the SLM group and the CAD/CAM group（P〉0.05）, while there were significant difference between the SLM or the CAD/CAM group and the wax-lost-casting group（P〈0.01）. Conclusions Co-Cr alloy full crowns fabricated by three methods provided acceptable marginal adaptation in clinic, and the marginal adaptation of SLM and CAD/CAM crowns was closed to America Dental Association standards. It is worthy of clinical popularization and application.

关 键 词：计算机辅助设计 牙科铸造技术 选择性激光熔覆技术 边缘适合性 

分 类 号：R783.3[医药卫生—口腔医学]