复合树脂联合两种酸蚀粘结剂与乳牙釉质及牙本质的剪切粘结强度比较

目的:比较复合树脂联合全酸蚀和自酸蚀粘结剂与乳牙釉质及牙本质的剪切粘结强度。方法:收集新鲜拔除的滞留乳磨牙48个,随机分为4组,分别制备全酸蚀和自酸蚀粘结剂的釉质和牙本质试件,电子万能试验机测定各组剪切强度;体视显微镜下观察试件断面的破坏模式;扫描电镜观察粘结界面情况。结果:全酸蚀粘结剂组的釉质剪切强度明显高于牙本质剪切强度(P<0.05);自酸蚀粘结剂组釉质与牙本质剪切粘结强度无统计学差异(P>0.05);全酸蚀粘结剂组的釉质、牙本质剪切粘结强度均明显高于自酸蚀粘结剂组(P<0.05);体视显微镜及扫描电镜观察均显示,全酸蚀粘结剂与釉质和牙本质的粘结界面结合程度好于自酸蚀粘结剂。结论:全酸蚀粘结剂处理对乳牙釉质及牙本质的剪切粘结强度高于自酸蚀粘结剂。

Shear bond strength of total-etching and self-etching adhesive agents to primary teeth

AIM: To evaluate the shear bond strength of total-etching and self-etching adhesive system to enamel and dentin of primary teeth.METHODS: Forty retained deciduous teeth were randomly divided into 4 groups and were respectively prepared into enamel and dentinal specimens using total-etching and self-etching adhesive agents.The shear bond strength of the specimens were examined after being bonded using composite resin and the bonding interface rupture mode(pattern) were observed under stereomicroscope.Furthermore,eight retained deciduous teeth were randomly divided into 2 groups(total-etching group and self-etching group) and were respectively prepared into enamel and dentinal specimens(with 2 specimens in each group),the bonding interface were observed using scanning electron microscope.RESULTS: In total-etching adhesive group,the shear bond strength of enamel specimen was significantly higher than that of dentinal specimen(P<0.05).In self-etching adhesive group,there was no statistical significance between the enamel and dentinal shear bond strength(P>0.05).The shear bond strength in total-etching adhesive group was significantly higher than that in self-etching adhesive group(P>0.05).Under stereomicroscope and under scanning electron microscope,the bonding degree between total-etching adhesive agent and the enamel and dentinal of primary teeth was bettter than self-etching adhesive agent.CONCLUSION: The shear bond strength of total-etching adhesive agent was significantly higher than that of self-etching adhesive agent on the enamel and dentin of primary teeth.