De Munck J, Braem M, Wevers M, Yoshida Y, Inoue S, Suzuki K, Lambrechts P, Van Meerbeek B
Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Leuven BIOMAT Research Cluster, Catholic University of Leuven, Kapucijnenvoer 7, B-3000 Leuven, Belgium.
Biomaterials. 2005 Apr;26(10):1145-53. doi: 10.1016/j.biomaterials.2004.04.013.
The bonding effectiveness of restorative materials to tooth tissue is typically measured statically. Clinically tooth/composite bonds are however subjected to cyclic sub-critical loads. Therefore, in vitro fatigue testing of dental adhesives should predict better the in vivo performance of adhesives. The objective of this study was to determine the fatigue resistance of two representative adhesives, a self-etch and an etch&rinse adhesive, bonded to enamel and dentin. Therefore, tooth/composite interfaces were cyclically loaded using a miniaturized version of a rotating beam fatigue testing device. Subsequently, the load at which 50% of the specimens fail after 10(5) cycles, was determined as the median micro-rotary fatigue resistance (microRFR). For both adhesives, the microRFR was about 30-40% lower than the corresponding micro-tensile bond strength (microTBS) to both enamel and dentin. Analysis of the fracture surfaces by Feg-SEM revealed typical fatigue fracture patterns. It is concluded that resin/tooth interfaces are vulnerable to progressive damage by sub-critical loads, with the 3-step etch&rinse adhesive being more resistant to fatigue than the 2-step self-etch adhesive.
修复材料与牙齿组织的粘结有效性通常采用静态测量。然而在临床上，牙齿/复合树脂粘结会受到周期性亚临界负荷的作用。因此，牙科粘结剂的体外疲劳测试应能更好地预测粘结剂在体内的性能。本研究的目的是确定两种代表性粘结剂（一种自酸蚀粘结剂和一种酸蚀冲洗粘结剂）与釉质和牙本质粘结后的抗疲劳性能。因此，使用旋转梁疲劳测试装置的小型化版本对牙齿/复合树脂界面进行循环加载。随后，将10⁵次循环后50%的试样发生破坏时的负荷确定为中位微旋转疲劳抗力（microRFR）。对于这两种粘结剂，其microRFR均比与釉质和牙本质相应的微拉伸粘结强度（microTBS）低约30%-40%。通过场发射扫描电子显微镜（Feg-SEM）对断裂表面进行分析，揭示了典型的疲劳断裂模式。得出的结论是，树脂/牙齿界面易受亚临界负荷的渐进性损伤，三步酸蚀冲洗粘结剂比两步自酸蚀粘结剂具有更强的抗疲劳能力。
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