Effect Of Surface Treatment on Shear Bond Strength of Acrylic Resin to Cobalt-Chromium Alloy

Abstract

Aims: to evaluate the effect of metal primer with acid etch, laser beam, and sand blasting on shear bond strength(SBS) or resin metal and surface roughness(SR). Materials and methods: fifty Co-Cr metal plate were prepared with 10X10X1 mm dimensions. These metal plates were divided in to 5 groups control (without treatment), acid etched with hydrochloric acid(10%) with metal primer(AP), laser beam with metal primer(LP), sand blasting with metal primer(SP), and metal primer alone(P). These groups were tested for shear bond strength of resin to metal and surface roughness. Results: there are a significant differences in shear bond strength of all treated groups in contrast to control groups, and the AP had the highest shear bond strength value. While surface roughness of tested samples shows the control group smoothest surface in relation to other groups and there is no significant difference with metal primer only and the AP group had higher surfaces roughness. Conclusion: metal primer improve bond strength between Co-Cr and chemical cured acrylic resin, the treating surface with HCL acid increase SBS and SR of metal plate. The roughening of metal surface by different treatment ( P, AP, LP, and SP) improve the SBS of metal bond to resin.