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目的:评价三种牙齿漂白剂对自酸蚀粘接系统粘接正畸托槽粘接强度的影响。方法:将100颗人前磨牙均分为四组:空白对照组(组1)、38%过氧化氢漂白组(组2)、10%过氧化脲漂白组(组3)和20%过氧化脲漂白组(组4),漂白牙齿后即刻使用自酸蚀正畸粘接系统Transbond Plus SEP将托槽粘接在牙面上,测量各组的抗剪切粘接强度,评价其剩余粘接剂指数,对结果进行统计学分析。结果:空白对照组的抗剪切粘接强度高于各漂白组,组2的抗剪切粘接强度高于组3和组4,而组4的抗剪切粘接强度最低,其差异均具有统计学意义(P<0.05)。各组的剩余粘接剂指数差异均有统计学意义(P<0.05),剩余粘接剂指数最低者为空白对照组,最高者为20%过氧化脲组。结论:在使用自酸蚀粘接系统粘接正畸托槽前应禁止使用过氧化物漂白牙齿,特别是高浓度的过氧化脲。
OBJECTIVE: To evaluate the effect of three dental bleaching agents on the bond strength of orthodontic brackets for self-etching adhesive systems. Methods: 100 human premolar teeth were divided into four groups: blank control group (group 1), 38% hydrogen peroxide bleaching group (group 2), 10% urea peroxide bleaching group (group 3) and 20% Bleaching group (group 4), after bleaching the teeth, self-etching orthodontic bonding system Transbond Plus SEP was used to bond the brackets to the tooth surfaces. The shear bond strength of each group was measured and the remaining adhesive Index, the results of a statistical analysis. Results: The shear bond strength of blank control group was higher than that of bleaching group, the shear bond strength of group 2 was higher than that of group 3 and group 4, while the group 4 had the lowest shear bond strength Statistically significant (P <0.05). Residual adhesive index of each group were statistically significant differences (P <0.05), the lowest remaining adhesive index for the blank control group, the highest for the 20% urea peroxide group. Conclusion: Peroxide bleaching of teeth, especially high concentrations of urea peroxide, should be prohibited until orthodontic brackets are bonded using a self-etching adhesive system.