earticle

영어

The purpose of this study was to investigate the effect retention element formed by metal surface treatment method on the bond strength of indirect composite resin and metal. The metal specimens were cast from Ni-Cr alloy(Rexillium III). They were divided into 5 groups by applied retention element: 50um aluminium oxide sandblasting group, 250um aluminium oxide sandblasting group, 0.2 retention crystal group, 10% H2SO4 solution etching group, 110um RocatecTM Plus system group. Total 50 metal specimens were veneered with Sinfony indirect composite resin system. Specimens were tested for shear bond strength on an Instron universal testing machine and fracture mode of fractured specimens were analyzed by SEM and EDS. 1. 0.2mm retention crystals were most effective in improving the resin-metal shear bond strength (p<0.05). 2. Sandblasting by 250um aluminium oxide were more effective than sandblasting by 50um aluminium oxide in improving the resin-metal shear bond strength(p<0.05).
3. Fracture mode of resin-metal fractured surface were cohesive failure mode in 0.2mm retention crystal, mixed failure mode in sandblasted specimens, etched specimens and the specimens sandblasted with 110um RocatecTM Plus system.