Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Med Oral Patol Oral Cir Bucal. 2011 Nov 1;16(7):e990-6. doi: 10.4317/medoral.17127.
The aim of this study was to compare the shear bond strength (sbs) of three different adhesives on bleached enamel immediately after bleaching, bleached/delayed for 1 week, and bleached/applied antioxidizing agent.
The enamel surfaces of 144 freshly extracted incisors without any caries and restorations were flattened and divided into 12 groups. The following adhesives were investigated: Optibond FL (OFL) (three-step etch&rinse), Optibond Solo Plus (OSP) (two-step etch&rinse), Optibond All-in-One (OA) (one-step self-etch), (Kerr, Orange, USA). Unbleached enamel groups were prepared as negative controls. The remainder surfaces were bleached with 20% Opalescent PF (Ultradent, USA) 6 h/d for 5 consecutive days. Specimens were bonded immediately after bleaching, after 1 week or after using 10% sodium ascorbate gel for 6 hours. After 500 rounds of thermocycling, sbs was measured and data was analyzed with Kruskall-Wallis and Mann-Whitney U-tests ( = 0.05).
The sbs decreased for the adhesives after bleaching except for OFL. The effect of applying sodium ascorbate subsequent to bleaching was not equal for the studied adhesives. While for OFL, sbs of the sodium ascorbate group was significantly higher than the unbleached control group, for OSP, the sodium ascorbate group had no statistically significant difference with the unbleached control group and for OA, sbs was significantly lower than the unbleached control group.
Different adhesives demonstrate different degrees of reversed bond strength subsequent to applying antioxidant. It seems the method of application and the chemical composition of the adhesives could affect the antioxidant as a reducing agent.
本研究旨在比较三种不同的胶粘剂在漂白后即刻、漂白/延迟 1 周和漂白/应用抗氧化剂时对牙釉质的剪切结合强度（SBS）。
144 颗新鲜无龋和修复的切牙的釉质表面被压平并分为 12 组。研究了以下三种胶粘剂：Optibond FL（OFL）（三步酸蚀/冲洗）、Optibond Solo Plus（OSP）（两步酸蚀/冲洗）和 Optibond All-in-One（OA）（一步自酸蚀）（Kerr，Orange，USA）。未漂白的釉质组作为阴性对照组。其余表面用 20% Opalescent PF（Ultradent，USA）6 h/d 漂白 6 小时，连续 5 天。漂白后即刻、漂白后 1 周或使用 10%抗坏血酸钠凝胶 6 小时后进行粘结。经过 500 次热循环后，测量 SBS，并使用 Kruskal-Wallis 和 Mann-Whitney U 检验对数据进行分析（ = 0.05）。
除 OFL 外，所有胶粘剂在漂白后 SBS 均降低。漂白后应用抗坏血酸钠对研究的胶粘剂的影响并不相同。对于 OFL，抗坏血酸钠组的 SBS 明显高于未漂白对照组，而对于 OSP，抗坏血酸钠组与未漂白对照组无统计学差异，对于 OA，SBS 明显低于未漂白对照组。
不同的胶粘剂在应用抗氧化剂后表现出不同程度的反向结合强度。抗氧化剂作为还原剂的应用方法和胶粘剂的化学成分似乎会影响其效果。
