关键词: 牙本质, 粘接测试, 自酸蚀粘接剂, 微小拉伸测试

Abstract:

Objective    To evaluate the bonding performance of six self-etching adhesives on dentin by using micro-tensile bond strength test and scanning electronic microscopy （SEM） observation.  Methods    Thirty-six human third molars were used in this study. Six self-etching adhesives were employed： Clearfil Mega Bond （MB）， Clearfil Protect Bond（PB），BeautiBond（BB），BondForce（BF），EasyBond（EB）and G-Bond plus（GBp）. After exposing the dentin surface by gypsum model trimmer， 600-grit Sic paper was used to remove the smear layer under water cooling. Each adhesive was strictly applied under the instruction and followed by build-up with resin composite to 6mm. After storage in 37°C distilled water for 24 hours， the dentin-resin bonded teeth were sectioned into approximately 1.0mm2 specimen for the Micro-Tensile Bond Strength （μTBS） test. The fractured surfaces on dentin side and failure modes were observed and determined by SEM respectively. Results    The bond strength of MB was statistically higher than the other adhesives （P < 0.05）. Bubbles could be observed in the adhesive layer of BB，BF and GBp. Failure modes analysis indicated that over 50% failure modes was dentin or resin failure in MB group.  Conclusion    In this study， MB shows significantly higher bond strength in comparison with the other self-etching adhesives.

Key words: dentin, bond testing, self-etching adhesive, micro-tensile bond strength test