OBJECTIVES:To evaluate the micro-shear bond strength to enamel and dentin, pH and hardness of two self-etching adhesives over a period of 60 weeks storage at different temperatures. MATERIALS AND METHODS:Two self-etching systems, an all-in-one adhesive, Clearfil Tri-S Bond (TS) and a two-step adhesive, Clearfil SE Bond (SE) were used in this study (both by Kuraray Medical, Osaka, Japan). Their micro-shear bond strengths to enamel and dentin were measured. The materials were then stored at 4, 23 or 37 degrees C. Their bond strengths were measured again after 1, 4, 16 and 60 weeks and compared to the base line. The nano-indentation hardness of the polymerized bonding, pH of SE primer and TS were also measured at the baseline and after 60 weeks of storage at three different temperatures. Bond-strength and hardness data were analyzed using ANOVA and post hoc tests at the significance level of 0.05. RESULTS:Two-way ANOVA analysis showed that both storage conditions and material type had significant effects on bond strength to enamel or dentin but the interactions of these factors were not significant for any of the substrates. One-way ANOVA post hoc tests revealed that the bond strength of adhesives stored at 37 degrees C significantly decreased during the storage period; with the earliest significant decreases observed at 4 weeks for TS and at 16 weeks for SE. After 60 weeks of storage, the hardness obtained for SE bonding resin was not significantly different with that at the baseline for 4, 23 and 37 degrees C groups, but there was a significant decrease observed in hardness for TS stored at 37 degrees C, compared to that at the baseline. The pH of both self-etching materials decreased when they were stored at 37 degrees C. CONCLUSION:Storage time and temperature significantly affected the bond strength of both materials through the time dependent hydrolysis and other changes that are likely to occur in the water-containing self-etching agents at high temperatures.

译文

目的:评估两种在不同温度下储存60周的自蚀刻胶粘剂对牙釉质和牙本质的微剪切粘合强度,pH值和硬度。
材料与方法:这项研究使用了两个自蚀刻系统,即一体式粘合剂Clearfil Tri-S Bond(TS)和两步式粘合剂Clearfil SE Bond(SE)(均由Kuraray Medical,日本大阪)。测量了它们对牙釉质和牙本质的微剪切粘合强度。然后将材料存储在4、23或37摄氏度下。在1、4、16和60周后再次测量其粘合强度,并与基准线进行比较。还在基线和在三种不同温度下储存60周后,测量了聚合键的纳米压痕硬度,SE底漆和TS的pH。使用ANOVA和事后检验分析粘结强度和硬度数据,显着性水平为0.05。
结果:双向方差分析表明,储存条件和材料类型对与牙釉质或牙本质的粘合强度均具有显着影响,但这些因素的相互作用对任何底物均不显着。单向方差分析事后测试表明,在37°C下储存的胶粘剂的粘合强度在储存期间显着降低;在TS的第4周和SE的第16周观察到最早的显着下降。储存60周后,SE粘合树脂的硬度与4、23和37摄氏度组的基线硬度没有显着差异,但是与在37摄氏度下储存的TS相比,硬度明显降低达到基线时的水平。两种自蚀刻材料的pH值均在37摄氏度下存储时降低。
结论:储存时间和温度通过时间依赖性水解和在高温下水性自蚀刻剂中可能发生的其他变化,显着影响两种材料的粘合强度。

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