氧化锆陶瓷托槽微渗漏深度和粘接强度的体外实验研究

In-vitro experimental research on microleakage depth and bonding strength of zirconia ceramic bracket

目的评价GC正畸光固化玻璃离子粘接剂粘接氧化锆陶瓷托槽的微渗漏深度和粘接强度。方法将54颗离体前磨牙随机分为3组,即氧化锆组、氧化铝组和金属组,各18颗牙,分别用GC正畸光固化玻璃离子粘接剂将氧化锆陶瓷托槽、氧化铝陶瓷托槽和金属托槽粘结于实验牙上,体视显微镜下检测各组粘接面微渗漏深度,用万能材料试验机测试抗剪切粘接强度,20倍放大镜下观察粘接剂牙面残留指数(ARI)。结果各组微渗漏深度无统计学差异(P>0.05)。氧化锆陶瓷托槽与牙面之间的抗剪切粘接强度与氧化铝陶瓷托槽无显著差异(P>0.05),但它们均大于金属托槽(P<0.05),各组的抗剪切粘接强度均在临床适用范围内,且ARI值无显著差异(P>0.05)。结论 GC正畸光固化玻璃离子粘接剂可用于粘接氧化锆陶瓷托槽,其粘接面的微渗漏深度与氧化铝陶瓷托槽和金属托槽无明显差异,但抗剪切粘接强度高于金属托槽,可供临床使用。

Objective To assess the microleakage depth and bonding strength of zirconia ceramic bracket bonded with GC orthodontic light curing glass ionic adhesive. Methods A total of 54 in-vitro premolars were randomly divided into three groups, i.e.the zirconia group, the aluminum oxide group and the metal group（n=18, respectively）. The GC orthodontic light curing glass ionic adhesive was applied to separately bond a zirconia ceramic bracket, an aluminum oxide ceramic bracket and a metal bracket to the experimental teeth. A stereo microscope was used to detect microleakage depth of the bonding face; a universal material tester w as used to test the shear bonding strength, and a 20 × amplifier was used to observe the adhesive remnant index（ARI）. Results No statistical differences in microleakage depth were found among the groups（P〈0.05）. There was no significant difference in shear bonding strength between the zirconia ceramic bracket and the tooth face from that between the aluminum oxide ceramic bracket and the tooth face（P〈0.05）, but the shear bonding strength in the two cases was greater than that in the case of metal bracket（P〈0.05）.The shear bonding strength in each group was kept within the clinically applicable range and there was no significant difference in ARI（P〈0.05）. Conclusion The GC orthodontic light curing glass ionic adhesive can be used to bond zirconia ceramic brackets.There are no significant differences in microleakage depth of the bonding face from the aluminum oxide and metal brackets, but the shear bonding strength is higher than that of the metal bracket. In sum, the adhesive is clinically applicable.