Türkkahraman Hakan, Adanir Necdet, Güngör A Yalcin
Department of Orthodontics, Faculty of Dentistry, University of Suleyman Demirel, Isparta, Turkey.
Angle Orthod. 2007 May;77(3):489-93. doi: 10.2319/0003-3219(2007)077[0489:BADAEO]2.0.CO;2.
To evaluate the effects of bleaching and desensitizer application on shear bond strengths of orthodontic brackets.
Forty-eight extracted human premolar teeth were randomly assigned to 4 groups of 12 each. The first group of teeth was bleached with a 35% hydrogen peroxide office bleaching agent. The second group was bleached the same as the first group and UltraEZ desensitizer was applied. No bleaching procedures were applied on the third and fourth groups. UltraEZ desensitizer alone was applied to teeth in the third group. The fourth group served as control. Orthodontic brackets were bonded with a LC (light cure) composite resin and cured with a halogen light. After bonding, the shear bond strengths of the brackets were tested with a Universal testing machine.
The results showed that bleaching, bleaching plus desensitizer, and desensitizer procedures significantly reduced the bonding strengths of the orthodontic brackets (P < .05, P < .001, and P < .01, respectively). No statistically significant difference was found between bleaching, bleaching plus desensitizer, and desensitizer groups (P > .05).
Because bleaching and desensitizer application significantly affected shear bond strengths of orthodontic brackets on human enamel, they should be delayed until the completion of orthodontic treatment.
评估漂白和应用脱敏剂对正畸托槽剪切粘结强度的影响。
48颗拔除的人类前磨牙随机分为4组，每组12颗。第一组牙齿用35%的过氧化氢诊室漂白剂进行漂白。第二组与第一组一样进行漂白并应用UltraEZ脱敏剂。第三组和第四组不进行漂白操作。第三组牙齿单独应用UltraEZ脱敏剂。第四组作为对照组。正畸托槽用LC（光固化）复合树脂粘结并用卤素灯固化。粘结后，用万能试验机测试托槽的剪切粘结强度。
结果显示，漂白、漂白加脱敏剂以及脱敏剂处理均显著降低了正畸托槽的粘结强度（分别为P <.05、P <.001和P <.01）。漂白组、漂白加脱敏剂组和脱敏剂组之间未发现统计学上的显著差异（P >.05）。
由于漂白和应用脱敏剂会显著影响正畸托槽在人类牙釉质上的剪切粘结强度，因此应推迟到正畸治疗完成后进行。
