Shinkai Koichi, Wakaki Suguru, Suzuki Shiro, Katoh Yoshiroh
Department of Operative Dentistry, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
Odontology. 2007 Jul;95(1):38-43. doi: 10.1007/s10266-007-0075-7. Epub 2007 Jul 25.
This study evaluated the effect of tooth bleaching on the microtensile bond strength (microTBS) of an experimental primer to enamel. Materials used were an experimental tooth manicure system (Shofu) composed of primer and light-cured flowable resin composite. Flattened enamel surfaces of bovine teeth were bleached with Nite White Excel (Discus Dental) or Hi-Lite (Shofu), with nonbleached teeth used as a control group. Each bleaching group was subdivided into three bonding modes. These were group A, application of primer for 3 s, followed by 5 s of air blowing; group B, application of primer for 10 s, followed by 5 s of air blowing; and group C, application of 20% phosphoric acid for 10 s, spraying with water for 5 s, and then air blowing for 5 s. The flowable resin paste was placed and polymerized after each enamel surface treatment. Using a low-speed diamond saw, the specimens were sectioned into beam-shaped samples with a cross-sectional area of approximately 1 mm(2) at the bonded interface. The samples were subjected to the microTBS test with a 1.0 mm/min crosshead speed. Data were statistically analyzed using two-way analysis of variance (ANOVA) followed by the Bonferroni/Dunn post-hoc test. The two-way ANOVA revealed significant differences in the effects of the bleaching systems and bonding mode, and significant differences were also found for the interaction between them (P < 0.01). There were no statistically significant differences in microTBS values among the specimens in groups A and B regardless of bleaching or nonbleaching (P > 0.05). In contrast, the microTBS value of group C without bleaching was significantly higher than that of all other experimental groups (P < 0.01).
本研究评估了牙齿漂白对一种实验性底漆与牙釉质之间微拉伸粘结强度（microTBS）的影响。所用材料为一种由底漆和光固化流动树脂复合材料组成的实验性牙齿修复系统（松风）。用Nite White Excel（Discus Dental）或Hi-Lite（松风）对牛牙的平整牙釉质表面进行漂白，未漂白的牙齿作为对照组。每个漂白组再细分为三种粘结模式。这些模式分别为：A组，涂抹底漆3秒，随后吹气5秒；B组，涂抹底漆10秒，随后吹气5秒；C组，涂抹20%磷酸10秒，喷水5秒，然后吹气5秒。在每次牙釉质表面处理后放置并聚合流动树脂糊剂。使用低速金刚石锯，将标本在粘结界面处切成横截面积约为1平方毫米的梁状样本。以1.0毫米/分钟的十字头速度对样本进行微拉伸粘结强度测试。数据采用双向方差分析（ANOVA）进行统计分析，随后进行Bonferroni/Dunn事后检验。双向方差分析显示，漂白系统和粘结模式的影响存在显著差异，并且它们之间的相互作用也存在显著差异（P < 0.01）。无论是否漂白，A组和B组样本的微拉伸粘结强度值在统计学上均无显著差异（P > 0.05）。相比之下，未漂白的C组的微拉伸粘结强度值显著高于所有其他实验组（P < 0.01）。
