[Influence of different surface treatments on resin nano ceramic-resin cement bond strength]

This work aimed to evaluate the effect of different surface treatments on the shear bond strength of resin nano ceramic to resin cement, thereby providing a theoretical basis for the improvement of clinical application.A total of 150 specimens (10 mm×10 mm×3 mm) were milled from resin nano ceramic blocks (Lava Ultimate) using computer-aided design/computer aided manufacturing(CAD/CAM) technology. The specimens were randomly divided into five groups according to the surface treatment performed, as follows: control, sandblasted, sandblasted+silane, hydrofluoric acid, and hydrofluoric acid+silane groups. After the corresponding surface treatment, the specimens were cemented using Single Bond Universal Adhesive and RelyXTM Ultimate ClickerTM adhesive resin cement. All cemented specimens were placed in distilled water for 24 h and 30 days and subjected to a shear bond strength test in a universal testing machine.The surface treatment and water storage periods showed significant effects on bond strength. Surface treatment with sandblasted+silane showed the highest shear strength values among all tested groups, and the difference was statistically significant (P0.05). A difference was observed between the control and hydrofluoric acid groups, and both had significantly difference compared with other groups (P0.05). Sandblasted and hydrofluoric acid+silane groups were not statistically different, and both had significantly difference compared with other groups (P0.05).The surface of resin nanoceramic treated by sand-blasted, sandblasted+silane, and hydrofluoric acid+silane can improve the bond strength. The sandblasted+silane group had the best the shear bond strength among the groups.目的 评估不同表面处理对纳米复合陶瓷与树脂水门汀剪切粘接强度的影响。方法 将纳米复合陶瓷用计算机辅助设计/计算机辅助制作（CAD/CAM）技术切割成大小为10 mm×10 mm×3 mm的试件150块，并根据表面处理方法不同将试件按随机数字表的方法随机分为5组（n=30）：对照组、喷砂组、喷砂+硅烷组、酸蚀组和酸蚀+硅烷组。各组试件经过相应表面处理后，使用Single Bond Universal通用粘接剂+RelyXTM Ultimate ClikerTM树脂水门汀将树脂试件粘接于纳米复合陶瓷试件上，37 ℃蒸馏水中水浴24 h和30 d，万能试验机进行剪切粘接强度测试。结果 不同表面处理方法、不同的水浴时间都会影响到剪切粘接强度。喷砂+硅烷组的剪切粘接强度最大，与其他各组间差异均具有统计学意义（P0.05）；对照组和酸蚀组间差异无统计学意义，但两组与其他组间差异具有统计学意义（P0.05）；喷砂组和酸蚀+硅烷组之间差异无统计学意义（P0.05），但两组与其他组间差异具有统计学意义（P0.05）。结论 喷砂、喷砂+硅烷、酸蚀+硅烷对纳米复合陶瓷表面处理，均可提高其与树脂水门汀的剪切粘接强度，喷砂+硅烷处理后剪切粘接强度最佳。.