Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Hong Kong, SAR, China.
Oper Dent. 2010 Nov-Dec;35(6):624-33. doi: 10.2341/09-379-L.
This study examined the effects of using two different burs for dentin surface preparation on the microtensile bond strength (microTBS) of three resin luting cements. Flat, deep dentin surfaces from 45 extracted human third molars were divided into three groups (n = 15) according to bur type: (i) diamond bur and (ii) tungsten carbide bur. The controls were abraded with #600-grit SiC paper. Both burs operated in a high-speed handpiece under water-cooling. Composite blocks were luted onto the dentin using one of three cements: RelyX ARC (ARC, 3M ESPE), Panavia F2.0 (PF, Kuraray) and RelyX Unicem (UN, 3M ESPE) following the manufacturers' instructions. For ARC, the dentin surface was treated with 32% phosphoric acid. The bonded specimens were stored at 37 degrees C for 24 hours and sectioned into 0.9 x 0.9 mm beams for microTBS testing. The data were analyzed using the two-way ANOVA and Student-Newman-Keuls tests. Representative fractured beams from each group were prepared for fractographic analysis under SEM. Two-way ANOVA revealed that the effects of "dentin surface preparation" and "luting cement" were statistically significant (p < 0.001); however, the interaction of these two factors was not significant (p > 0.05). ARC showed no significant difference in microTBS among the three differently prepared dentin surfaces. The microTBS of PF and UN was significantly lower when bonding to dentin prepared with a diamond bur (p < 0.05), compared to the control. For Panavia F2.0, higher bond strengths were achieved on the dentin surface prepared with a tungsten carbide bur. Proper bur selection is essential to optimizing the dentin adhesion of self-etch resin luting cements.
本研究旨在探讨两种不同金钢砂车针对牙本质表面预备对三种树脂水门汀微拉伸粘结强度（microTBS）的影响。从 45 颗人第三磨牙中取出的深而平坦的牙本质表面根据车针类型分为三组（n = 15）：（i）钻石车针和（ii）碳化钨车针。对照组用 #600 粒度 SiC 砂纸打磨。两种车针均在高速手机下使用水冷操作。根据制造商的说明，使用三种水门汀之一将复合块粘接到牙本质上：RelyX ARC（ARC，3M ESPE）、Panavia F2.0（PF，Kuraray）和 RelyX Unicem（UN，3M ESPE）。对于 ARC，牙本质表面用 32%磷酸处理。粘结后的样本在 37°C 下储存 24 小时，然后切成 0.9 x 0.9 毫米的梁进行 microTBS 测试。数据采用双因素方差分析和 Student-Newman-Keuls 检验进行分析。从每组中选择有代表性的断裂梁，在 SEM 下进行断口分析。双因素方差分析表明，“牙本质表面预备”和“水门汀”的效果具有统计学意义（p < 0.001）；然而，这两个因素之间的相互作用不显著（p > 0.05）。ARC 在三种不同预备的牙本质表面上的 microTBS 没有显著差异。与对照组相比，当用钻石车针预备牙本质时，PF 和 UN 的 microTBS 显著降低（p < 0.05）。对于 Panavia F2.0，用碳化钨车针预备牙本质时获得更高的粘结强度。选择合适的车针对优化自酸蚀树脂水门汀的牙本质粘结至关重要。
