Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Dent Mater J. 2011;30(5):655-63. doi: 10.4012/dmj.2011-066. Epub 2011 Sep 23.
The purpose of this study was to investigate bond durability of MMA-based adhesives to root dentin in a simulated complete vertical root fracture (CVRF). The fractured fragments of human premolar root were reattached using Super-Bond C&B (SB; Sun Medical), M-Bond or M-Bond II (MB or MB II; Tokuyama Dental). After storage for 1 day, 1 month, 6 months and 1 year, the reattached specimens were subjected to microtensile bond strength (µTBS) test at cervical and apical regions. Results showed that µTBS was significantly higher to cervical dentin than to apical dentin in MB and MB II, but not SB (p<0.05). Significant decrease in µTBS was found for MB and MB II after 1 year, whereas no significant difference was found for SB (p<0.05). Analysis of failure mode by SEM indicated differences over time. In conclusion, significant differences were found in the regional bond durability among MMA-based adhesives used to restore CVRF, that may lead to different clinical performances.
本研究旨在探讨 MMA 基胶粘剂与模拟完全垂直根折（CVRF）中根管牙本质的结合耐久性。使用 Super-Bond C&B（SB；Sun Medical）、M-Bond 或 M-Bond II（MB 或 MB II；Tokuyama Dental）将人前磨牙的断裂碎片重新附着。在储存 1 天、1 个月、6 个月和 1 年后，将重新附着的标本在颈部和根尖区域进行微拉伸结合强度（µTBS）测试。结果表明，在 MB 和 MB II 中，µTBS 对颈牙本质的强度明显高于根尖牙本质，但 SB 则不然（p<0.05）。1 年后，MB 和 MB II 的 µTBS 显著下降，而 SB 则无显著差异（p<0.05）。SEM 分析的失效模式表明存在时间上的差异。总之，用于修复 CVRF 的 MMA 基胶粘剂在区域结合耐久性方面存在显著差异，这可能导致不同的临床性能。
