Chung K H, Hwang Y C
Department of Restorative Dentistry, Faculty of Dentistry, National Yang-ming University, Taiwan, Republic of China.
J Prosthet Dent. 1997 Sep;78(3):267-74. doi: 10.1016/s0022-3913(97)70025-8.
Metal porcelain combined surfaces are often involved in the repairing of fractured porcelain fused to metal restoration.
This study investigated the effect of surface treatments on the bonding strength of porcelain fused to metal prosthesis repair.
Specimens (8 x 4 mm) were fabricated with Biobond II casting alloy and randomly divided into three surface groups: metal, porcelain, and metal-porcelain combined surface. Biobond porcelain system and commercially available porcelain repair systems were tested. The metal surface group was further divided into two subgroups: control and sandblasting treatment (Al2O3, 50 microns, 20 seconds). In the porcelain surface group, there were three subgroups: (1) control, (2) sandblasting, and (3) 9.5% hydrofluoric acid etching for 4 minutes. The metal-porcelain surface combined group was divided into three subgroups: (1) control, (2) sandblasting, and (3) sandblasting and etching. The manufacturer's instructions for repair systems were followed for specimen preparation. Shear bond strengths of 10 specimens for each subgroup were determined with a universal testing machine after storing in distilled water at 37 degrees C for 7 days. The data were analyzed with analysis of variance and Scheffé F-test at the 95% significance level.
The Liner-M repair system showed significantly greater strength than the other tested systems on the metal surface with or without sandblasting treatment (p < 0.05). On the porcelain surface, the strengths of sandblasting and etching subgroups ranged from 7.2 to 16.8 MPa, and 6.8 to 16.8 MPa, respectively. There were no significant differences in bond strengths between sandblasting and combined treatment of the metal-porcelain combined surface group (p > 0.05).
The results of this study suggest that metal substrates treated with sandblasting and porcelain treated with either hydrofluoric acid or sandblasting can increase repair strength.
金属烤瓷结合面常涉及到烤瓷熔附金属修复体折断后的修复。
本研究调查表面处理对烤瓷熔附金属修复体修复粘结强度的影响。
用Biobond II铸造合金制作试件（8×4mm），随机分为三个表面组：金属组、瓷组和金属 - 瓷结合面组。测试Biobond烤瓷系统和市售烤瓷修复系统。金属表面组进一步分为两个亚组：对照组和喷砂处理组（Al2O3，50微米，20秒）。瓷表面组有三个亚组：（1）对照组，（2）喷砂组，（3）9.5%氢氟酸蚀刻4分钟组。金属 - 瓷表面结合组分为三个亚组：（1）对照组，（2）喷砂组，（3）喷砂加蚀刻组。按照修复系统制造商的说明制备试件。将每组10个试件在37℃蒸馏水中储存7天后，用万能试验机测定剪切粘结强度。数据在95%显著性水平下用方差分析和Scheffé F检验进行分析。
在有或无喷砂处理的金属表面上，Liner - M修复系统的强度显著高于其他测试系统（p < 0.05）。在瓷表面上，喷砂组和蚀刻组的强度分别为7.2至16.8MPa和6.8至16.8MPa。金属 - 瓷结合面组喷砂和联合处理之间的粘结强度无显著差异（p > 0.05）。
本研究结果表明，喷砂处理的金属基底以及氢氟酸或喷砂处理的瓷均可提高修复强度。
