复合树脂与玻璃陶瓷微拉伸粘接强度的体外研究

目的: 研究复合树脂与玻璃陶瓷的微拉伸粘接强度,以及树脂表面处理和老化对粘接强度的影响。方法: 制备离体牙牙本质块、树脂块及瓷试块,使用树脂水门汀粘固。根据粘固底物(牙本质与瓷或树脂与瓷)、不同树脂表面处理以及是否温度循环老化进行分组。对照组为牙本质与瓷粘固(A1、A2组);实验组为树脂与瓷粘固,对树脂表面不处理(B1、B2组)或分别进行以下处理,即甲基丙烯酸酯单体(C1、C2组)、硅烷化(D1、D2组)、粗化(E1、E2组)、抛光(F1、F2组)处理后再与瓷粘固。将粘固后的试块切为长方体试件,试件制备后即刻(A1~F1组)或经温度循环后(A2~F2组)测试微拉伸粘接强度。扫描电镜观察试件断面形态,采用单因素方差分析对所得数据进行统计学分析。结果: 老化前后,未经表面处理的树脂与瓷的微拉伸粘接强度B1 (30.02±3.85) MPa,B2 (26.83±3.14) MPa]均高于牙本质与瓷A1 (20.55±4.51) MPa,A2 (12.94±0.69) MPa](P<0.05)。与未行表面处理(B1、B2组)相比,经表面处理后树脂与瓷(C1~F1、C2~F2组)的粘接强度差异无统计学意义。结论: 树脂与瓷粘固,可获得不低于牙本质与瓷的粘接强度,对树脂进行甲基丙烯酸酯单体处理、硅烷化、粗化或抛光等表面处理不能有效提升树脂与瓷的粘接强度。

Evaluation of microtensile bond strength between resin composite and glass ceramic

Objective: To evaluate the microtensile bond strength of resin composite to glass ceramic, and the effect of surface treatment of resin composite and thermal cycling aging on the microtensile bond strength. Methods: Rectangular blocks were made with dentin of extracted molars, resin composite or feldspathic glass ceramic respectively. The bonding surfaces of these rectangular blocks were sanded by 600-grit silicon carbide paper before luting. A self-etching resin cement was used as luting agent. The specimens were divided into groups according to the types of substrates of adhesion (dentin/glass ceramic or resin composite/glass ceramic), the way of surface treatments and whether thermal cycling aging ocurred. The dentin blocks were adhered to ceramic blocks as controls (group A1 and A2). The resin composite blocks were adhered to the ceramic blocks as experiment groups. The resin composite surfaces were treated by different ways before luting: no extra surface treatment (group B1 and B2), treated by ethyl methacrylate solution (group C1 and C2) or silane coupling agent (group D1 and D2), coarsened by 360-grit silicon carbide paper (group E1 and E2) or polished by 1 200-grit silicon carbide paper (group F1 and F2). After luting, the microtensile bond strength of the specimens were tested before (group A1-F1) or after (group A2-F2) thermal cycling aging. After microtensile bond strength test, the fracture bonding surfaces of the specimens were observed by a scanning electron microscopy to determine the type of bonding failure. The data were statistically analyzed using one-way analysis of variance. Results: The microtensile bond strength of resin composite to glass ceramic with no extra treatment achieved high bond values before and after thermal cycling B1 (30.02±3.85) MPa, B2 (26.83±3.14) MPa], which were statistically different from those of the control groups A1 (20.55±4.51) MPa, A2 (12.94±0.69) MPa, P<0.05]. The microtensile bond strength between the glass ceramic and resin composite did not increase after different surface treatments of resin composite. Conclusion: The microtensile bond strength between resin composite and glass ceramic achieved as similar bond strength as that between dentin and glass ceramic and even better. Surface treatment of resin composite via methyl methacrylate solution, silane coupling agent, coarsening, or polishing did not increase the microtensile bond strength effectually.