Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan.
Department of Restorative Dentistry, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.
J Prosthodont Res. 2024 Apr 8;68(2):283-289. doi: 10.2186/jpr.JPR_D_22_00301. Epub 2023 Jun 7.
Purpose This study aims to evaluate the effects of resin primers containing methyl methacrylate (MMA) and silane agent on the bonding effectiveness of indirect resin composite blocks with three different filler contents.Methods A commercially available computer-aided design/computer-aided manufacturing (CAD/CAM) resin composite block and two experimental resin composite blocks with different filler contents were alumina-blasted and two surface treatments (primer and silane agent) were applied. The resin cement was built up, and the micro-tensile bond strength (μTBS) was measured after 24 hours, 1 month or 3 months of water storage (n = 24 per group). The fracture surfaces after μTBS measurements and resin block/cement interface were observed by scanning electron microscopy (SEM).Results The primer treatment group showed a significantly higher bond strength than the silane group only in F0 (filler content 0 wt%) group (P < 0.001). In the primer group, F0 and F41 (filler content 41 wt%) groups showed significantly higher bond strengths than F82 (filler content 82 wt%) group (P < 0.001). In contrast, in the silane group, F41 group showed significantly higher bond strength than F0 and F82 groups (P < 0.001), and F82 group showed significantly higher bond strength than F0 group (P < 0.001). SEM revealed that the matrix resin was partially destroyed on the fracture surface of the primer group, and an uneven interface surface was observed compared with that of the silane group.Conclusions MMA-containing primers showed higher bonding effectiveness to CAD/CAM resin composite blocks than the silane treatment.
目的 本研究旨在评估含甲基丙烯酸甲酯（MMA）和硅烷剂的树脂底胶对具有三种不同填料含量的间接树脂复合块粘结效果的影响。
方法 对市售计算机辅助设计/计算机辅助制造（CAD/CAM）树脂复合块和两种具有不同填料含量的实验性树脂复合块进行氧化铝喷砂处理，并进行两种表面处理（底胶和硅烷剂）。 24 小时、1 个月或 3 个月水储存后，构建树脂粘结剂，并测量微拉伸粘结强度（μTBS）（每组 24 个）。在测量 μTBS 后和树脂块/粘结剂界面处用扫描电子显微镜（SEM）观察断裂表面。
结果 仅在 F0（填料含量 0wt%）组中，底胶处理组的粘结强度明显高于硅烷组（P < 0.001）。在底胶组中，F0 和 F41（填料含量 41wt%）组的粘结强度明显高于 F82（填料含量 82wt%）组（P < 0.001）。相比之下，在硅烷组中，F41 组的粘结强度明显高于 F0 和 F82 组（P < 0.001），F82 组的粘结强度明显高于 F0 组（P < 0.001）。SEM 显示底胶组的断裂表面上部分基质树脂被破坏，与硅烷组相比，界面表面不均匀。
结论 含 MMA 的底胶对 CAD/CAM 树脂复合块的粘结效果优于硅烷处理。
