El Mourad Aminah M
Department of Restorative Dental Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia, Mobile: +966 11 8055832; e-mail: amourad@ ksu.edu.sa.
J Contemp Dent Pract. 2019 Feb 1;20(2):247-257.
This study aimed to examine the effect of postoperative home bleaching using 20% carbamide peroxide on the shear bond strengths of different adhesives to enamel and to verify the failure mode for each test specimen.
One hundred sound human molars were used in this study. Bonding procedures were performed on the flattened buccal enamel surfaces according to the manufacturer's instructions. OptiBond Solo Plus adhesive (Kerr), Single Bond Universal adhesive (3M ESPE) applied with both the total-etch and self-etch techniques, and Tetric N-Bond Universal adhesive (Ivoclar Vivadent) applied with both the total-etch and self-etch techniques were used, followed by resin composite post fabrication (Filtek Z350 XT; 3M ESPE). All specimens were thermo-cycled for 5000 cycles and then divided into the control (non-bleach) and postoperative bleaching groups (20% carbamide peroxide). The shear bond strength values were measured and compared between the two groups. Data were analyzed using one-way analysis of variance with Tukey's test ( = 0.05). The failure modes of debonded specimens were evaluated using a digital microscope (50×). The bonding interfaces of the resin composite posts to different enamel conditions (control and postoperative bleaching) were observed by a scanning electron microscope (SEM) before the shear bond test.
The shear bond strength values of all tested adhesives were lower in the postoperative bleaching group than they were in the control (non-bleach) group, particularly the bond strength values of self-etch adhesives.
The stability of bonded resin composite restorations to enamel, using different dental adhesives, could be compromised after the bleaching procedure at varying sensitivity levels.
Replacement of bonded resin composite restorations to enamel might be considered after bleaching procedures, especially if these restorations were previously bonded with self-etch adhesives.
本研究旨在探讨使用20%过氧化脲进行术后家庭漂白术对不同粘接剂与牙釉质剪切粘接强度的影响，并验证每个测试样本的失败模式。
本研究使用了100颗健康人磨牙。根据制造商的说明，在平坦的颊侧牙釉质表面进行粘接程序。使用OptiBond Solo Plus粘接剂（ Kerr公司）、采用全酸蚀和自酸蚀技术的Single Bond Universal粘接剂（3M ESPE公司）以及采用全酸蚀和自酸蚀技术的Tetric N-Bond Universal粘接剂（义获嘉伟瓦登特公司），随后制作树脂复合桩（Filtek Z350 XT；3M ESPE公司）。所有样本进行5000次热循环，然后分为对照组（未漂白）和术后漂白术组（20%过氧化脲）。测量并比较两组的剪切粘接强度值。数据采用单因素方差分析和Tukey检验进行分析（α = 0.05）。使用数字显微镜（50倍）评估脱粘样本的失败模式。在进行剪切粘接测试前，通过扫描电子显微镜（SEM）观察树脂复合桩与不同牙釉质状况（对照和术后漂白）的粘接界面。
术后漂白术组中所有测试粘接剂的剪切粘接强度值均低于对照组（未漂白），尤其是自酸蚀粘接剂的粘接强度值。
使用不同牙科粘接剂时，牙釉质上粘接的树脂复合修复体在漂白程序后，其稳定性可能会受到不同程度的损害，敏感性各异。
漂白程序后，可能需要考虑更换牙釉质上粘接的树脂复合修复体，尤其是如果这些修复体之前是用自酸蚀粘接剂粘接的。
