Gökçe Bülent, Cömlekoğlu M Erhan, Ozpinar Birgül, Türkün Murat, Kaya Ayşegül Demirbaş
Ege University, School of Dentistry, Department of Prosthodontics, Izmir, Turkey.
J Dent. 2008 Oct;36(10):780-5. doi: 10.1016/j.jdent.2008.05.008. Epub 2008 Jun 25.
The aim of this study was to comparatively investigate the effect of antioxidant treatment and delayed bonding after bleaching with carbamide peroxide on the shear bond strength (SBS) of a luting resin to enamel.
Forty flat enamel surfaces were prepared from freshly extracted human molars using a low speed diamond saw, then divided into three bleaching groups (n=10/group) and a control group (n=10). Group 1 consisted of specimens bonded immediately after bleaching. Group 2 specimens were treated with an antioxidant agent, 10% sodium ascorbate, while Group 3 specimens were immersed in artificial saliva for 1 week after bleaching. Specimens in Group 4 were not bleached, but immersed in artificial saliva for 1 week before bonding. Forty ceramic blocks (Empress 2, Ivoclar) were prepared and luted to teeth using a dual-curing resin cement (Variolink II, Ivoclar). The specimens were thermocycled and the SBS tests were performed using a universal testing machine (crosshead speed: 0.5mm/min). Fracture analysis of the bonded surfaces was done using a scanning electron microscope. Statistical analysis was carried out by Kruskall-Wallis and Mann-Whitney U-tests.
While the samples that were immediately bonded after bleaching (Group I) demonstrated significantly lower shear bond strengths and 10% sodium ascorbate group (Group II) demonstrated significantly higher bond strengths than control group samples (p<0.05), no significant differences were found among delayed bonded group and control group (p>0.05).
Using sodium ascorbate with a concentration of 10% may be reliable for reversing the compromised bond strength.
本研究旨在比较过氧化脲漂白后抗氧化处理及延迟粘结对粘结树脂与牙釉质剪切粘结强度（SBS）的影响。
使用低速金刚石锯从新鲜拔除的人磨牙制备40个平坦的牙釉质表面，然后分为三个漂白组（每组n = 10）和一个对照组（n = 10）。第1组由漂白后立即粘结的标本组成。第2组标本用抗氧化剂10%抗坏血酸钠处理，而第3组标本在漂白后浸泡在人工唾液中1周。第4组标本未漂白，但在粘结前浸泡在人工唾液中1周。制备40个陶瓷块（Empress 2，义获嘉），并用双固化树脂水门汀（Variolink II，义获嘉）粘结到牙齿上。对标本进行热循环处理，并使用万能试验机（十字头速度：0.5mm/min）进行SBS测试。使用扫描电子显微镜对粘结表面进行断裂分析。采用Kruskal-Wallis和Mann-Whitney U检验进行统计分析。
虽然漂白后立即粘结的样本（第1组）显示出明显较低的剪切粘结强度，10%抗坏血酸钠组（第2组）显示出比对照组样本明显更高的粘结强度（p<0.05），但延迟粘结组和对照组之间未发现显著差异（p>0.05）。
使用浓度为10%的抗坏血酸钠可能可靠地逆转受损的粘结强度。
