Watanabe I, Nakabayashi N
Division of Organic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan.
Quintessence Int. 1993 May;24(5):335-42.
The long-term durability of a photocured resin bond to ground bovine dentin with its smear layer retained was investigated. The bonding resin that was employed was composed of 5.0 wt% 2-(methacryloxy)ethyl phenyl hydrogen phosphate (phenyl-P) as a diffusion-promoting monomer, 0.5 wt% camphorquinone as a photosensitizer, and 0.5 wt% N-phenylglycine as a reducing agent in triethyleneglycol dimethacrylate. Following polymerization of the bonding resin, a composite resin was placed and photocured for 60 seconds. Prepared specimens were stored in 37 degrees C water for 1 day, 6 months, and 1 year. Measured tensile bond strengths were 6.7 MPa after 1 day of storage, 4.1 MPa after 6 months of storage, and 2.8 mPa after 1 year of storage. Examinations of the interfaces after fracture under tensile loading suggested that long-term water-immersion weakened the bonds between the photocured adhesive resin and the smear layer-retained dentin because there was insufficient diffusion of the adhesive resin through the retained smear layer.
研究了光固化树脂与保留有玷污层的磨除牛牙本质之间的长期耐久性。所使用的粘结树脂由5.0 wt%的2-(甲基丙烯酰氧基)乙基苯基磷酸氢酯（苯基-P）作为扩散促进单体、0.5 wt%的樟脑醌作为光敏剂以及0.5 wt%的N-苯基甘氨酸作为三乙二醇二甲基丙烯酸酯中的还原剂组成。粘结树脂聚合后，放置复合树脂并光固化60秒。制备的标本在37℃水中储存1天、6个月和1年。储存1天后测得的拉伸粘结强度为6.7 MPa，储存6个月后为4.1 MPa，储存1年后为2.8 mPa。拉伸加载断裂后对界面的检查表明，长期水浸会削弱光固化粘结树脂与保留有玷污层的牙本质之间的粘结，因为粘结树脂通过保留的玷污层的扩散不足。
