关键词: 耐久性测试, 树脂牙本质粘接, 微拉伸测试, 自酸蚀粘接剂, 扫描电子显微镜

Abstract:

Objective    To evaluate the bonding performance of four commercial available self-etching systems by micro-tensile bond strength test. Methods    Four self-etching adhesives were included in this study： Easy Bond （EB，3M ESPE， USA）， G-Bond plus （GBp， GC Corporation， Japan）， Clearfil Mega Bond （MB， Kuraray Medical INC， Japan） and Clearfil Protect Bond （PB， Kuraray Medical INC， Japan）. Eighty human third molars without caries were separated into 20 groups with 4 teeth in each group for different water-storage durations. After bonding by following the manufacturer’s instruction， the teeth were built-up with resin composite （Clearfil AP-X） and being stored in 37 ℃ distilled water for 24 hours， 3 months， 6 months， 12 months and 24 months. The bonded specimens were sectioned into 1.0 mm2 sticks for the micro-tensile bond strength （μTBS） test. The obtained data were expressed as MPa and statistically analyzed by Games-Howell test （P＜0.05）. Results    Of all-in-one adhesives， EB and GBp showed significant decrease after 24 months of water storage in comparison with 24 hours. On the other hand， two-step self-etching systems expressed no statistical decrease in μTBS after 24 months water-storage compared with that of 24 hours. Conclusion    After 24hours， the bonding performance of HEMA-contained all-in-one system is better than that of HEMA-free all-in-one system. On the other hand， two-step self-etching systems might have consistent bonding performance compared with that of all-in-one systems in long-time durability test.

Key words: durability, resin-dentin bonds, micro-tensile bond strength test, self-etching system, scanning electron microscope