3种窝洞修复方法之间微渗漏的比较

Comparison of the marginal microleakage of three cavity restoration methods

目的:探讨用复合树脂修复Ⅴ类洞时,3种不同修复方法之间微渗漏的差异。方法:挑选36颗3个月内拔除的完整磨牙,制备颊面Ⅴ类洞,将牙随机平均分为3组(n=12),分别使用直接充填法、预热充填法和间接嵌体法完成3M Z350复合树脂修复体,经过500次冷热水循环试验后用品红染色。将牙体纵切成厚度为0.9 mm的薄片,用体视显微镜观测染料渗透深度。结果:预热树脂组和嵌体组之间微渗漏差别无显著性,均显著小于直接充填组(P≤0.05)。结论:使用预热树脂充填和嵌体修复均可减小Ⅴ类洞龈壁边缘微渗漏。

Objective：To compare the marginal microleakage of class V cavity restored with composite resin by 3 different methods. Methods：Class Ⅴ cavity was prepared in 36 human third molars,the teeth were randomly divided into 3 groups（n =1 2）and were repaired with common Z350 resin,pre-heated Z350 resin and Z350 resin inlay,respectively.After thermal cycling for 500 times the teeth were immersed in fuchsin solution for 24 h.Then the samples were sectioned longitudinally and examined for leakage under stereomicroscope.Results：The microleakage of cavity restoration by pre-heated Z350 resin and Z350 resin inlay was significantly low-er than that of the direct restoration with Z350 resin（P≤0.05）.No significant difference was found between the groups of pre-heated Z350 resin and Z350 resin inlay.Conclusion：Marginal microleakage of Z350 resin restoration can be decreased by preheating of the resin.