自粘结树脂水门汀粘结强度的体外评价

Bond strength evaluation of a self-adhesive composite resin cement in vitro

目的评估自粘结性流动水门汀的粘结强度能否满足临床需要。方法将完整的22颗下颌离体第三磨牙咬合面暴露牙本质后分成A、B两组。A组为对照组,使用Para core(PC);B组为实验组,使用EmbraceTM(E)。A、B组再各自分为A1、A2、A3、B1、B2、B3。A1、B1组各5颗进行微拉伸实验;A2、B2组各5颗进行抗剪切实验,记录断裂峰值,利用SPSS 19.0统计学软件进行独立样本t检验分析数据;A3、B3组各1颗经过酸蚀、喷金后,在扫描电镜下观察粘结界面形态。结果在抗剪切实验与微拉伸实验中,PC组微拉伸强度高于E组(P﹤0.05)。且两者的抗剪切数据无显著差异(P﹥0.05),满足临床需求。扫描电镜下,PC比E的树脂突长且细。结论自粘结水门汀的粘结强度弱于两步法水门汀,粘结强度与粘结界面的形态结构存在一定关联性。

Objective To evaluate if the bond strength of a self-adhesive composite resin cement meets the clinical needs. Methods After the dentin surface being exposed,22 selected human third molars were divided into two groups: Group A and Group B. Para core( PC) was used in group A( control group) while EmbraceTM( E) was used in group B( experimental group). Then group A was divided into A1( n = 5) 、A2( n = 5) 、A3( n = 1),and simultaneously group B was divided into B1( n = 5) 、B2( n = 5) 、B3( n = 1). 5teeth of A1 、B1groups received micro tensile test while 5 of A2 、B2 groups received shear test. Then the fracture loads were recorded.T-test and data analysis was preformed with SPSS19. 0 software. The adhesive interfacial microstructures of A3、B3 groups under SEM were observed after they had been respectively etched and sprayed by metal. Results The strength of E group was lower than that in PC group in terms of micro-tensile bond( P < 0. 05),meanwhile there was no significant difference in shear bond strength( P > 0. 05)between the two groups,which meant that the bond strength of a self-adhesive composite resin cement met the clinical needs. SEM showed that the resin tags in PC group were larger in number and longer in length than those in E group. Conclusions The bond strength of self-adhesive cements is lower than that in PC group,and there is connection between the interfacial configuration of adhesives and bond strength of them.