Borges Alessandra B, Torres Carlos R G, de Souza Paulo A B, Caneppele Taciana M F, Santos Luciana F T F, Magalhães Ana Carolina
Department of Restorative Dentistry, School of Dentistry, Universidade Estadual Paulista (UNESP), São José dos Campos, Av. Francisco José Longo, 777, 12245-000 São José dos Campos, SP, Brazil.
Int J Dent. 2012;2012:347848. doi: 10.1155/2012/347848. Epub 2012 Oct 30.
This in vitro study evaluated the effect of 35% hydrogen peroxide (HP) bleaching gel modified or not by the addition of calcium and fluoride on enamel susceptibility to erosion. Bovine enamel samples (3 mm in diameter) were divided into four groups (n = 15) according to the bleaching agent: control-without bleaching (C); 35% hydrogen peroxide (HP); 35% HP with the addition of 2% calcium gluconate (HP + Ca); 35% HP with the addition of 0.6% sodium fluoride (HP + F). The bleaching gels were applied on the enamel surface for 40 min, and the specimens were subjected to erosive challenge with Sprite Zero and remineralization with artificial saliva for 5 days. Enamel wear was assessed using profilometry. The data were analyzed by ANOVA/ Tukey's test (P < 0.05). There were significant differences among the groups (P = 0.009). The most enamel wear was seen for C (3.37 ± 0.80 μm), followed by HP (2.89 ± 0.98 μm) and HP + F (2.72 ± 0.64 μm). HP + Ca (2.31 ± 0.92 μm) was the only group able to significantly reduce enamel erosion compared to C. The application of HP bleaching agent did not increase the enamel susceptibility to erosion. However, the addition of calcium gluconate to the HP gel resulted in reduced susceptibility of the enamel to erosion.
这项体外研究评估了添加或不添加钙和氟的35%过氧化氢（HP）漂白凝胶对牙釉质抗侵蚀性的影响。将牛牙釉质样本（直径3毫米）根据漂白剂分为四组（n = 15）：对照组 - 不进行漂白（C）；35%过氧化氢（HP）；添加2%葡萄糖酸钙的35% HP（HP + Ca）；添加0.6%氟化钠的35% HP（HP + F）。将漂白凝胶涂覆在牙釉质表面40分钟，然后用零度雪碧对样本进行侵蚀挑战，并用人工唾液再矿化5天。使用轮廓仪评估牙釉质磨损情况。数据通过方差分析/ Tukey检验进行分析（P < 0.05）。各组之间存在显著差异（P = 0.009）。C组（3.37 ± 0.80μm）的牙釉质磨损最严重，其次是HP组（2.89 ± 0.98μm）和HP + F组（2.72 ± 0.64μm）。与C组相比，HP + Ca组（2.31 ± 0.92μm）是唯一能够显著减少牙釉质侵蚀的组。HP漂白剂的应用并未增加牙釉质对侵蚀的敏感性。然而，向HP凝胶中添加葡萄糖酸钙可降低牙釉质对侵蚀的敏感性。
