3种树脂水门汀对CAD/CAM全瓷-牙本质剪切强度的比较

目的:评价3种树脂水门汀对CAD/CAM全瓷-牙本质剪切强度的影响。方法:选取新鲜拔除的人磨牙30颗,制备牙本质黏结面,随机分为3组(n=10),分别选用全酸蚀树脂水门汀RelyX ARC、自酸蚀树脂水门汀Clearfil DCBond和自黏结树脂水门汀RelyX Unicem对CAD/CAM硅酸锂玻璃全瓷进行黏结,测试3种树脂水门汀对CAD/CAM全瓷-牙本质的剪切强度,并通过立体显微镜观察牙本质的黏结界面。采用SPSS11.0软件包对数据进行统计学分析。结果:RelyX ARC组的剪切强度为(15.90±6.15)MPa,Clearfil DC Bond组的剪切强度为(14.41±5.07)MPa,而RelyXUnicem组的剪切强度为(23.29±7.39)MPa,与前2组相比有显著性差异(P<0.05)。立体显微镜观察显示,3组黏结断面均位于牙本质与树脂水门汀之间。结论:自酸蚀树脂水门汀及自黏结树脂水门汀与CAD/CAM硅酸锂玻璃陶瓷修复体的黏结强度不低于传统全酸蚀树脂水门汀,且临床操作简便,为临床全瓷黏结提供了更多便利与选择。

Evaluation of bond strength of three resin cements on CAD/CAM ceramic-dentin

PURPOSE: To evaluate the bond strength of 3 resin cements on ceramic-dentin.METHODS: Thirty sound human posterior tooth were selected for this study and the flat dentin surfaces were prepared.The specimens were divided into 3 groups(n=10) randomly,which were bonded to the CAD/CAM ceramics with RelyX ARC(etch-and-rinse adhesive),Clearfil DC Bond(self-etching resin cement) and RelyX Unicem(self-adhesive resin cement).The bond strengths were tested and the bond surfaces were observed under stereoscopic microscope.SPSS 11.0 software package was used for statistical analysis.RESULTS: The shear bond strength of RelyX ARC and Clearfil DC Bond was(15.90±6.15)MPa and(14.41±5.07)MPa,respectively.The shear strength of RelyX Unicem was(23.29±7.39)MPa,significantly higher than the others.The shear strength between the three resin cements was significantly different(P<0.05).CONCLUSION: Clearfil DC Bond and RelyX Unicem can achieve a successful bond on CAD/CAM ceramic crowns.