Department of Restorative Dentistry, São Leopoldo Mandic Research Center, Campinas, São Paulo, Brazil.
J Am Dent Assoc. 2010 Mar;141(3):300-6. doi: 10.14219/jada.archive.2010.0164.
The authors conducted an in situ study of the influence of various time intervals after tooth bleaching with 35 percent hydrogen peroxide on the bond strength of resin-based composite restorations.
After selecting 20 participants, the authors randomly fixed enamel and dentin blocks onto the buccal surfaces of posterior maxillary teeth one week before performing tooth bleaching with 35 percent hydrogen peroxide. After the bleaching treatment, they removed one block of dentin or enamel and prepared it for the bond strength tests according to these time intervals: no bleaching treatment (controls), immediately after bleaching, seven days after bleaching, 14 days after bleaching and 21 days after bleaching.
The analysis of variance and Tukey test showed significant differences between times (P<.05), and shear bond strength values of resin-based composite to enamel and dentin were lower immediately after the bleaching treatment.
The authors found that 35 percent hydrogen peroxide reduces the bond strength to enamel and dentin and that it is necessary to wait seven days before performing adhesive restorative procedures.
The results of this study suggest that clinicians should allow seven days to elapse after completion of in-office bleaching with 35 percent hydrogen peroxide before placing adhesive restorations.
作者进行了一项现场研究，研究了 35%过氧化氢牙齿漂白后不同时间间隔对树脂基复合修复体粘结强度的影响。
在选择了 20 名参与者后，作者在前牙颊面一周前随机固定牙釉质和牙本质块，用 35%过氧化氢进行牙齿漂白。漂白处理后，他们去除一块牙本质或牙釉质，并根据以下时间间隔进行粘结强度测试准备：无漂白处理（对照组）、漂白后即刻、漂白后 7 天、漂白后 14 天和漂白后 21 天。
方差分析和 Tukey 检验显示时间之间存在显著差异（P<.05），并且漂白处理后即刻，树脂基复合材料与牙釉质和牙本质的剪切粘结强度值较低。
作者发现 35%过氧化氢降低了对牙釉质和牙本质的粘结强度，并且在进行粘结修复程序之前需要等待七天。
本研究结果表明，临床医生应在完成 35%过氧化氢诊室漂白后等待七天，再进行粘结修复。
