Department of Dentistry, Federal University of Juiz de Fora, Campus GV (UFJF-GV), Governador Valadares, MG, Brazil.
Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University (UNESP), Araraquara, SP, Brazil.
Braz Dent J. 2023 Jul-Aug;34(4):62-71. doi: 10.1590/0103-6440202305553.
This study aimed to evaluate the effect of antioxidant solutions on fracture strength and bonding performance in non-vital and bleached (38% hydrogen peroxide) teeth. One hundred and eighty dentin specimens were obtained, 60 for each test: fracture strength, hybrid layer thickness, and bond strength. The groups (n=10) were randomly composed according to post-bleaching protocol: REST - restoration, without bleaching; BL - bleaching + restoration; SA - bleaching, 10% sodium ascorbate solution, and restoration; AT - bleaching, 10% α-tocopherol solution, and restoration; CRAN - bleaching, 5% cranberry solution, and restoration; CAP - bleaching, 0.0025% capsaicin solution, and restoration. Data were analyzed with ANOVA, Kruskal-Wallis, Dunn, and Qui-Square tests (α=0.05). The highest fracture strength values were observed in REST (1508.96 ±148.15 N), without significant difference for the bleached groups (p>0.05), regardless of the antioxidant use. The hybrid layer thickness in the group that was not subjected to bleaching (REST) was significantly higher than in any other group. The bond strength in the bleached and antioxidants-treated groups (SA, AT, CRAN, CAP) has no differences with the bleached group without antioxidants (BL). Adhesive failures were predominant in the groups that did not receive the antioxidant application. In conclusion, the evaluated antioxidants did not show an effect on the fracture strength, hybrid layer thickness, or bond strength of dentin bleached after endodontic treatment. The application of 10% sodium ascorbate, 10% alpha-tocopherol, 5% cranberry, or 0.0025% capsaicin solutions is not an effective step and should not be considered for the restorative protocols after non-vital bleaching.
本研究旨在评估抗氧化溶液对非活力和漂白（38%过氧化氢）牙齿的断裂强度和粘结性能的影响。获得了 180 个牙本质标本，每个测试 60 个：断裂强度、混合层厚度和粘结强度。根据漂白后方案，将组（n=10）随机组成：REST-修复，不进行漂白；BL-漂白+修复；SA-漂白，10%抗坏血酸钠溶液，修复；AT-漂白，10%α-生育酚溶液，修复；CRAN-漂白，5%蔓越莓溶液，修复；CAP-漂白，0.0025%辣椒素溶液，修复。使用方差分析、Kruskal-Wallis、Dunn 和 Qui-Square 检验（α=0.05）对数据进行分析。在 REST 组中观察到最高的断裂强度值（1508.96±148.15 N），而对于漂白组，无论是否使用抗氧化剂，差异均无统计学意义（p>0.05）。未进行漂白（REST）的组中的混合层厚度明显高于其他任何组。在接受漂白和抗氧化剂处理的组（SA、AT、CRAN、CAP）中，粘结强度与未接受抗氧化剂处理的漂白组（BL）无差异。在未应用抗氧化剂的组中，以粘固失败为主。结论：在所评估的抗氧化剂中，在根管治疗后漂白的牙本质的断裂强度、混合层厚度或粘结强度方面，没有显示出任何效果。应用 10%抗坏血酸钠、10%α-生育酚、5%蔓越莓或 0.0025%辣椒素溶液不是有效的步骤，不应考虑用于非活力漂白后的修复方案。
