Cavalli V, Reis A F, Giannini M, Ambrosano G M
University of Campinas, Piracicaba School of Dentistry, Department of Restorative Dentistry, Av Limeira 901, Piracicaba, SP, 13414-018, Brazil.
Oper Dent. 2001 Nov-Dec;26(6):597-602.
Recent studies have concluded that carbamide peroxide bleaching agents significantly affect the bond strength of composite to bleached enamel. This study evaluated the effects of bleaching regimen with different carbamide peroxide concentrations and post-treatment times on composite bond strength to enamel. Two hundred and four flat buccal and lingual enamel surfaces obtained from erupted sound third molars were randomly divided into 17 groups (n = 12). Sixteen experimental groups comprised the evaluation of four carbamide peroxide home bleaching agents (Opalescence 10%-20% and Whiteness 10%-16%) and four time intervals after bleaching (one day, one, two and three weeks). Specimens of control group were not submitted to bleaching and were stored in artificial saliva at 37 degrees C for 10 days. The specimens of experimental groups were exposed to one daily application of carbamide peroxide for six hours for 10 consecutive days. After each daily treatment and post-bleaching, the specimens were stored in artificial saliva solution. Bonds were formed with Scotchbond MP and Z-100 composite resin, and shear bond test was carried out 24 hours after adhesive-composite application. Two-way ANOVA showed that the bond strengths were significantly different (p < 0.05). For the first two weeks post-bleaching, the bond strengths of resin to enamel were low. After a lapse of three weeks, the bond strength returned to that of the untreated control group. Increased concentration did not prolong the time needed prior to bonding.
近期研究得出结论，过氧化脲漂白剂会显著影响复合材料与漂白牙釉质之间的粘结强度。本研究评估了不同浓度过氧化脲漂白方案及处理后时间对复合材料与牙釉质粘结强度的影响。从萌出的健康第三磨牙获取204个颊侧和舌侧平面牙釉质表面，随机分为17组（每组n = 12）。16个实验组包括对四种家用过氧化脲漂白剂（皓齿10%-20%和美白10%-16%）以及漂白后四个时间间隔（一天、一周、两周和三周）的评估。对照组样本未进行漂白，在37摄氏度的人工唾液中储存10天。实验组样本连续10天每天暴露于过氧化脲中6小时。每次日常处理及漂白后，样本均储存在人工唾液溶液中。使用Scotchbond MP和Z-100复合树脂形成粘结，并在涂抹粘结剂-复合材料后24小时进行剪切粘结测试。双向方差分析表明粘结强度存在显著差异（p < ０.０５）。在漂白后的前两周，树脂与牙釉质的粘结强度较低。三周后，粘结强度恢复到未处理对照组的水平。浓度增加并未延长粘结前所需的时间。
