De Munck J, Van Meerbeek B, Yoshida Y, Inoue S, Vargas M, Suzuki K, Lambrechts P, Vanherle G
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, B-3000 Leuven, Belgium.
J Dent Res. 2003 Feb;82(2):136-40. doi: 10.1177/154405910308200212.
Resin-dentin bonds degrade over time. The objective of this study was to evaluate the influence of variables like hybridization effectiveness and diffusion/elution of interface components on degradation. Hypotheses tested were: (1) There is no difference in degradation over time between two- and three-step total-etch adhesives; and (2) a composite-enamel bond protects the adjacent composite-dentin bond against degradation. The micro-tensile bond strength (microTBS) to dentin of 2 three-step total-etch adhesives was compared with that of 2 two-step total-etch adhesives after 4 years of storage in water. Quantitative and qualitative failure analyses were conducted correlating Fe-SEM and TEM. Indirect exposure to water did not significantly reduce the microTBS of any adhesive, while direct exposure resulted in a significantly reduced microTBS of both two-step adhesives. It is concluded that resin bonded to enamel protected the resin-dentin bond against degradation, while direct exposure to water for 4 years affected bonds produced by two-step total-etch adhesives.
树脂与牙本质的粘结会随时间而降解。本研究的目的是评估诸如杂交效果以及界面成分的扩散/洗脱等变量对降解的影响。所测试的假设为：（1）两步法和三步法全酸蚀粘结剂在随时间的降解方面没有差异；以及（2）复合树脂与牙釉质的粘结可保护相邻的复合树脂与牙本质的粘结免于降解。在水中储存4年后，比较了2种三步法全酸蚀粘结剂和2种两步法全酸蚀粘结剂与牙本质的微拉伸粘结强度（microTBS）。结合场发射扫描电子显微镜（Fe-SEM）和透射电子显微镜（TEM）进行了定量和定性的失效分析。间接接触水并未显著降低任何粘结剂的microTBS，而直接接触水则导致两种两步法粘结剂的microTBS显著降低。得出的结论是，粘结到牙釉质的树脂可保护树脂与牙本质的粘结免于降解，而直接接触水4年会影响两步法全酸蚀粘结剂产生的粘结。
