Rocha Regina Furbino Villefort, Anami Lilian Costa, Campos Tiago Moreira Bastos, Melo Renata Marques de, Souza Rodrigo Othávio de Assunção E, Bottino Marco Antonio
Prosthodontics Unit, Institute of Science and Technology, UNESP - Universidade Estadual Paulista, São José dos Campos. SP, Brazil.
Department of Physics, ITA - Instituto Tecnológico da Aeronáutica, São José dos Campos, SP, Brazil.
Braz Dent J. 2016 Oct-Dec;27(6):693-699. doi: 10.1590/0103-6440201600796.
Polyetheretherketone (PEEK) is a material suitable for frameworks of fixed dental prostheses. The effect of different surface treatments on the bond strength of PEEK bonded to human dentin was evaluated. One hundred PEEK cylinders (3 mm×3 mm) were divided into five groups according to surface treatment: silica coating, sandblasting with 45 μm Al2O3 particles, etching with 98% sulfuric acid for 5, 30 and for 60 s. These cylinders were luted with resin cement onto 50 human molars. First, each tooth was embedded in epoxy resin and the buccal dentin surface was exposed. Then, two delimited dentin areas (Æ:3 mm) per tooth were etched with 35% phosphoric acid and bonded with a two-step self-priming adhesive system. After the luting procedure the specimens were stored in water (24 h/37 °C). Shear bond strength (SBS) was tested using a universal testing machine (crosshead speed 0.5 mm/min; load cell 50 kgf) and failure types were assessed. Stress data (MPa) were analyzed using the Kruskal-Wallis test. Comparison of the proportions of different failure types was performed using the Bonferroni method (p<0.05). Kruskal-Wallis demonstrated that differences among groups were not significant (p=0.187). Mean SBS were as follows: silica coating, 2.12±1.12 MPa; sandblasting, 2.37±0.86 MPa; sulfuric acid 5 s, 2.28±1.75 MPa; sulfuric acid 30 s, 1.80±0.85 MPa; sulfuric acid 60 s, 1.67±0.94 MPa. Adhesive and mixed failures were predominant in all groups. Both physical and chemical surface treatments produced adhesion between PEEK, resin cement and dentin.
聚醚醚酮（PEEK）是一种适用于固定义齿支架的材料。评估了不同表面处理对PEEK与人类牙本质粘结强度的影响。将100个PEEK圆柱体（3毫米×3毫米）根据表面处理分为五组：二氧化硅涂层、用45微米Al2O3颗粒喷砂、用98%硫酸蚀刻5秒、30秒和60秒。这些圆柱体用树脂水门汀粘结到50颗人类磨牙上。首先，将每颗牙齿嵌入环氧树脂中，暴露颊侧牙本质表面。然后，每颗牙齿的两个划定牙本质区域（直径3毫米）用35%磷酸蚀刻，并用两步自酸蚀粘结系统粘结。粘结程序完成后，将标本储存在水中（24小时/37°C）。使用万能试验机测试剪切粘结强度（SBS）（十字头速度0.5毫米/分钟；测力传感器50千克力），并评估失败类型。使用Kruskal-Wallis检验分析应力数据（兆帕）。使用Bonferroni方法比较不同失败类型的比例（p<0.05）。Kruskal-Wallis检验表明各组之间差异不显著（p=0.187）。平均SBS如下：二氧化硅涂层，2.12±1.12兆帕；喷砂，2.37±0.86兆帕；硫酸5秒，2.28±1.75兆帕；硫酸30秒，1.80±0.85兆帕；硫酸60秒，1.67±0.94兆帕。所有组中粘结和混合失败占主导。物理和化学表面处理均在PEEK、树脂水门汀和牙本质之间产生了粘结力。
