Watanabe E K, Yatani H, Ishikawa K, Suzuki K, Yamashita A
Department of Fixed Prosthodontics, Okayama University Dental School, Okayama, Japan.
J Prosthet Dent. 2000 Mar;83(3):349-55. doi: 10.1016/s0022-3913(00)70139-9.
Previous studies have shown that provisional cement cannot be completely removed from the dentin surface and the remnants inhibit adhesion of resin cement to dentin.
This study investigated the effects of dentin conditioners on resin-dentin bonding after provisional cement contamination.
A total of 216 bovine dentin specimens were divided into 2 groups with and without provisional cement coating on the dentin surface. Each group was further divided into 3 subgroups with 2 conditioning methods and without dentin conditioning (36 specimens per subgroup). The 2 methods applied were (1) phosphoric acid etching and (2) phosphoric acid etching, followed by sodium hypochlorite gel. Provisional cement was completely removed with a curette before dentin conditioning. Stainless steel rods were luted to dentin surfaces with Panavia 21 resin cement. Tensile bond strengths were measured before and after thermocycling. The dentin surface was analyzed by SEM and energy dispersive x-ray spectroscopy. Three-way ANOVA and Scheffe's comparison test were performed (P =. 05).
Bond strength was significantly influenced by provisional cement application, type of dentin conditioning, and thermocycling. Bond strength decreased when treated with provisional cement, but the decreased strengths were restored to their original values or higher by both dentin conditioners used. Specimens treated with sodium hypochlorite gel applied after phosphoric acid etching demonstrated the highest bond strengths with good stability after thermocycling.
Application of sodium hypochlorite gel after phosphoric acid etching was more effective than etching with phosphoric acid alone to eliminate the inhibitory effect of provisional cement remnants on adhesion between resin cement and dentin.
先前的研究表明，临时粘结剂无法从牙本质表面完全去除，其残留物会抑制树脂粘结剂与牙本质的粘结。
本研究调查了临时粘结剂污染后牙本质调节剂对树脂-牙本质粘结的影响。
总共216个牛牙本质标本被分为两组，一组牙本质表面有临时粘结剂涂层，另一组没有。每组再进一步分为3个亚组，分别采用2种调节方法和不进行牙本质调节（每个亚组36个标本）。应用的2种方法是：（1）磷酸酸蚀；（2）磷酸酸蚀后再用次氯酸钠凝胶处理。在进行牙本质调节之前，用刮匙将临时粘结剂完全去除。用Panavia 21树脂粘结剂将不锈钢棒粘结到牙本质表面。在热循环前后测量拉伸粘结强度。通过扫描电子显微镜（SEM）和能量色散X射线光谱仪对牙本质表面进行分析。进行三因素方差分析和谢弗比较检验（P = 0.05）。
粘结强度受到临时粘结剂的应用、牙本质调节类型和热循环的显著影响。用临时粘结剂处理后粘结强度降低，但使用的两种牙本质调节剂都能将降低的强度恢复到原始值或更高。磷酸酸蚀后再用次氯酸钠凝胶处理的标本表现出最高的粘结强度，且在热循环后具有良好的稳定性。
磷酸酸蚀后应用次氯酸钠凝胶比单独使用磷酸酸蚀更有效地消除临时粘结剂残留物对树脂粘结剂与牙本质之间粘结的抑制作用。
Zotero 插件