Universidade Federal do Rio Grande do Sul - UFRS, School of Dentistry , Department of Surgery and Orthopedics , Porto Alegre , RS , Brazil .
Universidade Federal do Rio Grande do Sul - UFRS, School of Dentistry , Post-Graduate Program in Pediatric Dentistry , Porto Alegre , RS , Brazil .
Braz Oral Res. 2020 May 8;34:e045. doi: 10.1590/1807-3107bor-2020.vol34.0045.
This in vitro study aimed to evaluate the effect of a silane-containing universal adhesive used with or without a silane agent on the repair bond strength between aged and new composites. Forty nanohybrid composite resin blocks were stored in distilled water for 14 d and thermo-cycled. Sandpaper ground, etched, and rinsed speciments were randomly assigned into four experimental groups: silane + two-step etch-and-rinse adhesive system, two-step etch-and-rinse adhesive system, silane + silane-containing universal adhesive system, and silane-containing universal adhesive system. Blocks were repaired using the same composite. After 24 h of water storage, the blocks were sectioned and bonded sticks were submitted to microtensile testing. Ten unaged, non-repaired composite blocks were used as a reference group to evaluate the cohesive strength of the composite. Two-way ANOVA and Tukey's tests were used to analyze average µTBS. One-way ANOVA and Dunnet post-hoc tests were used to compare the cohesive strength values and bond strength obtained in the repaired groups (α = 0.05). The µTBS values were higher for the silane-containing universal adhesive compared to the two-step etch-and-rinse adhesive system (p = 0.002). Silane application improved the repair bond strength (p = 0.03). The repair bond strength ranged from 39.3 to 65.8% of the cohesive strength of the reference group. Using universal silane-containing adhesive improved the repair bond strength of composite resin compared to two-step etch-and-rinse adhesive. However, it still required prior application of a silane agent for best direct composite resin repair outcomes.
本体外研究旨在评估含有硅烷的通用粘结剂在使用或不使用硅烷处理剂的情况下对老化和新复合材料之间修复粘结强度的影响。将 40 个纳米复合树脂块储存在蒸馏水中 14 天并进行热循环。用砂纸打磨、蚀刻和冲洗试件，然后将其随机分配到四个实验组中：硅烷+两步酸蚀-冲洗粘结系统、两步酸蚀-冲洗粘结系统、硅烷+含硅烷的通用粘结系统和含硅烷的通用粘结系统。使用相同的复合材料修复块。在水储存 24 小时后，将块体切成薄片，并将粘结棒提交进行微拉伸测试。10 个未老化、未修复的复合块用作参考组，以评估复合材料的内聚强度。采用双向方差分析和 Tukey 检验分析平均µTBS。采用单因素方差分析和 Dunnet 事后检验比较修复组的内聚强度值和粘结强度（α=0.05）。与两步酸蚀-冲洗粘结系统相比，含硅烷的通用粘结剂的µTBS 值更高（p=0.002）。硅烷的应用提高了修复粘结强度（p=0.03）。修复粘结强度范围为参考组内聚强度的 39.3%至 65.8%。与两步酸蚀-冲洗粘结系统相比，使用通用含硅烷粘结剂提高了复合树脂的修复粘结强度。然而，为了获得最佳的直接复合树脂修复效果，仍需要预先应用硅烷处理剂。
