Khoroushi Maryam, Saneie Tahereh
Department of Operative Dentistry and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Dent Res J (Isfahan). 2012 Jan;9(1):46-53. doi: 10.4103/1735-3327.92943.
Antioxidizing agents have recently been suggested to compensate decreased bond strength of resin materials to bleached tooth tissues. This study compared the shear bond strength (SBS) of three different adhesives on bleached dentin immediately after bleaching, bleached/delayed for 1 week, and bleached/applied antioxidizing agent.
The dentinal surfaces of 132 intact extracted molars were prepared and divided into 12 groups. The following adhesives were investigated: Optibond FL (OFL) (three-step etch-and-rinse), Optibond Solo Plus (two-step etch-and-rinse), and Optibond all-in-one (OA) (one-step self-etch) (Kerr, Orange, USA). Unbleached dentin groups (groups 1-3) were prepared as negative controls (NC). The remainder surfaces (groups 4-12) were bleached with 20% Opalescent PF (Ultradent, USA). Specimens were bonded immediately after bleaching (groups 4-6), after 1 week (groups 7-9), or after using 10% sodium ascorbate (SA) gel (groups 10-12). Subsequent to bonding of composite resin, the samples were tested for SBS and analyzed using Kruskal-Wallis and Mann-Whitney tests (α=0.05).
Regarding control groups, OA showed the highest SBS among the studied adhesives (P<0.05). The SBS decreased for the adhesives after bleaching except for OFL. No statistically significant difference in SBS were noted when the SA and delayed bonding groups were compared with their similar NC groups (P>0.05) except the of delay bonding with OA.
The findings suggest that bond strength of resin to bleached dentin may be affected with the adhesive system. Reduced SBS to bleached dentin can be amended by the use of SA as an antioxidizing agent. However, the amount of reversed bond strength subsequent to applying antioxidant might be related to the kind of dental adhesive.
最近有人提出抗氧化剂可弥补树脂材料与漂白牙体组织间降低的粘结强度。本研究比较了三种不同粘结剂在漂白后即刻、漂白/延迟1周以及漂白/应用抗氧化剂情况下对漂白牙本质的剪切粘结强度（SBS）。
制备132颗完整拔除磨牙的牙本质表面并分为12组。研究了以下粘结剂：Optibond FL（OFL）（三步酸蚀冲洗）、Optibond Solo Plus（两步酸蚀冲洗）和Optibond全效粘结剂（OA）（一步自酸蚀）（美国加利福尼亚州橙县科尔公司）。未漂白牙本质组（1 - 3组）作为阴性对照（NC）。其余表面（4 - 12组）用20% Opalescent PF（美国Ultradent公司）进行漂白。标本在漂白后即刻（4 - 6组）、1周后（7 - 9组）或使用10%抗坏血酸钠（SA）凝胶后（10 - 12组）进行粘结。复合树脂粘结后，对样本进行SBS测试，并使用Kruskal - Wallis和Mann - Whitney检验进行分析（α = 0.05）。
关于对照组，在研究的粘结剂中OA显示出最高的SBS（P < 0.05）。除OFL外，漂白后粘结剂的SBS降低。当SA组和延迟粘结组与其相似的NC组比较时，除了OA延迟粘结外，SBS没有统计学上的显著差异（P > 0.05）。
研究结果表明树脂与漂白牙本质的粘结强度可能受粘结系统影响。使用SA作为抗氧化剂可改善对漂白牙本质降低的SBS。然而应用抗氧化剂后粘结强度恢复的量可能与牙科粘结剂的种类有关。
