万能金相显微镜在牙体充填材料微渗漏研究中的应用

Application of metalloscope in microleakage of dental filling materials

目的:定量观测玻璃离子在人离体牙充填后的微渗漏情况,比较传统型玻璃离子水门汀和树脂改性玻璃离子水门汀的边缘封闭性;试用万能金相显微镜为观测仪器,评价其应用效果。方法:选取新鲜无龋前磨牙,备洞,充填玻璃离子水门汀,37℃水浴条件下置于1%甲基蓝溶液浸染,万能金相显微镜下测量染液渗入深度,定量评价微渗漏程度。结果:在分别充填传统型玻璃离子水门汀和树脂改性玻璃离子水门汀的情况下,万能金相显微镜下测得的渗漏值分别为(27.11±6.23)μm和(26.92±5.02)μm,P>0.05,二者比较差异无统计学意义。结论:传统型玻璃离子水门汀和树脂改性玻璃离子水门汀充填后的边缘封闭性无显著差异;万能金相显微镜可用于牙体充填材料微渗漏的观测。

Objective：To quantitate and compare the microleakage of glass-ionomer cements in isolated human teeth,and to evaluate the effect of metalloscope as the measurement unit for the microleakage.Methods：20 extracted caries-free premolars were selected and randomly divided into 2 groups with 10 in each.The standard classⅠcavities were prepared on occlusal surface of the teeth and filled with glass-ionomer cements（group A） and resin-modified glass-ionomer cements（group B）respectively.The samples were kept in 1%methylene blue at 37 ℃ for 24 h.Metalloscope was used to visualize the depths of dye penetrated pathways and quantitate the depth of penetration respectively.Results：The dye penetrations existed in all of the groups.The microleakage depths of glass-ionomer cements and resin-modified glass-ionomer cements were（27.11±6.23）μm and（26.92±5.02）μm,（P〉0.05）.Conclusion：Glass-ionomer cements and resin-modified glass-ionomer cements filling have no significant difference in marginal microleakage,metalloscope could be used to measure the microleakage.