Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
J Mech Behav Biomed Mater. 2011 Apr;4(3):461-6. doi: 10.1016/j.jmbbm.2010.12.007. Epub 2010 Dec 25.
The aim of this study was to compare the microtensile bond strength of the etch and rinse adhesive versus one-component or two-component self-etch adhesives. Twelve intact human molar teeth were cleaned and the occlusal enamel of the teeth was removed. The exposed dentin surfaces were polished and rinsed, and the adhesives were applied. A microhybride composite resin was applied to form specimens of 4 mm height and 6 mm diameter. The specimens were sectioned perpendicular to the adhesive interface to produce dentin-resin composite sticks, with an adhesive area of approximately 1.4 mm(2). The sticks were subjected to tensile loading until failure occurred. The debonded areas were examined with a scanning electron microscope to determine the site of failure. The results showed that the microtensile bond strength of the etch and rinse adhesive was higher than that of one-component or two-component self-etch adhesives. The scanning electron microscope examination of the dentin surfaces revealed adhesive and mixed modes of failure. The adhesive mode of failure occurred at the adhesive/dentin interface, while the mixed mode of failure occurred partially in the composite and partially at the adhesive/dentin interface. It was concluded that the etch and rinse adhesive had higher microtensile bond strength when compared to that of the self-etch adhesives.
本研究旨在比较酸蚀冲洗型黏结剂与单组分或双组分自酸蚀黏结剂的微拉伸黏结强度。将 12 颗完整的人磨牙清洁干净，并去除牙齿的咬合面釉质。暴露的牙本质表面进行抛光和冲洗，然后应用黏结剂。将微混合复合树脂应用于形成 4mm 高、6mm 直径的样本。将样本垂直于黏结界面进行切割，产生具有约 1.4mm(2)黏结面积的牙本质-树脂复合材料棒。将棒材进行拉伸加载，直到发生失效。用扫描电子显微镜检查离解区域，以确定失效部位。结果表明，酸蚀冲洗型黏结剂的微拉伸黏结强度高于单组分或双组分自酸蚀黏结剂。牙本质表面的扫描电子显微镜检查显示出黏结和混合失效模式。黏结失效模式发生在黏结/牙本质界面，而混合失效模式部分发生在复合材料中，部分发生在黏结/牙本质界面。结论是，与自酸蚀黏结剂相比，酸蚀冲洗型黏结剂具有更高的微拉伸黏结强度。
