含不同溶剂的碳二亚胺对丙酮基酸蚀冲洗粘接系统粘接性能的影响

The influence of carbodiimide in different solvents on bonding performance of acetone-based etch-and-rinsing adhesive system

目的:探索水、乙醇、丙酮作选择溶剂时,碳二亚胺(carbodiimide,EDC)对丙酮基酸蚀冲洗粘接系统粘接性能的影响。方法:选择64颗离体第三磨牙,按照预处理剂种类及是否老化,随机分为8组(n=8),S0、S0a:去离子水;S、Sa:EDC水溶液;E、Ea:EDC乙醇溶液;B、Ba:EDC丙酮溶液。预处理后,采用Prime Bond NT完成粘接试件制备。S0、S、E、B为即刻组,S0a、Sa、Ea、Ba组进行冷热循环5000次老化处理。每组随机选取6个试件,测定剪切强度,观察断裂模式,剩余2个试件在SEM下观察粘接界面微观形貌。采用SPSS 20.0软件包对剪切强度进行统计学处理。结果:S组剪切强度大于S0组,Sa组大于S0a,差异有统计学意义(P<0.05),S、E、B组之间差异无统计学意义(P>0.05)。Sa、Ea、Ba组剪切强度依次增大,差异有统计学意义(P<0.05)。EDC、老化、溶剂单独主效应有统计学意义(P<0.05),EDC和老化之间有交互效应(P<0.05)。即刻组断裂模式以混合破坏为主,老化组以界面断裂为主。SEM下观察即刻组混合层均匀完整,S0a组裂纹最大,Ba组仅少量裂纹。结论:水、乙醇和丙酮作溶剂的EDC预处理,可提高丙酮基酸蚀冲洗粘接系统即刻和老化后粘接强度;丙酮作溶剂时,可最大限度地提高老化后粘接强度。

PURPOSE:To investigate the influence of carbodiimide(EDC)in water,ethanol and acetone on bonding performance of acetone-based etch-and-rinsing adhesive system.METHODS:Sixty-four third molars in vitro were randomly divided into 8 groups according to the types of pretreatment agents,with or without aging(n=8),group S0 and S0 a:deionized water;group S and Sa:EDC in water;group E and Ea:EDC in ethanol;group B and Ba:EDC in acetone.After pretreatment,the adhesive specimens were prepared by Prime Bond NT.S0,S,E and B were immediate groups,and S0 a,Sa,Ea and Ba groups were subjected to aging test for 5000 times.Six specimens were randomly selected from each group to test the shear bond strength and observe the fracture mode.The remaining 2 specimens were used to observe the microstructure of bonding interface by scanning electron microscopy.The shear bond strength was statistically analyzed with SPSS 20.0 software package.RESULTS:It was found that the shear bond strength of group S was significantly higher than that of group S0,and the shear bond strength of group Sa was significantly higher than that of group S0 a(P<0.05).There was no significant difference between groups S,E and B(P>0.05).The shear bond strength of Sa,Ea and Ba increased successively,and the difference was statistically significant(P<0.05).Three factor analysis of variance found that the main effect of EDC,aging and solvent alone was significantly different(P<0.05),and there was an interaction effect between EDC and aging(P<0.05).The fracture modes of immediate groups were mainly mixed failure,while the interface fracture was the most common in the aging groups.SEM observation showed that all the hybrid layers were uniform and complete in the immediate groups,and the largest crack in S0 a group and a few cracks in Ba group.CONCLUSIONS:EDC pretreatment in water,ethanol,and acetone solvents can improve both the immediate and aging bonding strength of acetone-based etch-and-rinsing adhesive system.Acetone acts as the solvents of EDC maximizes the shear bond strength among the aging groups.