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In last few decades, the porcelain fused to metal crown has been a successful dental restoration and many studies are worked and evaluated, but increasing availability of new base metal alloys demands constant evaluation of bonding and fracture between porcelain and metal coping. The aim of this study is to identify fracture phenomena and to measure bonding strength between porcelain and metal coping. This study evaluated the porcelain-metal bonding characteristics through three point bending test. Cast metal surface was sandblasted with 50μm, and 100μm aluminum oxide. After sandblasting, porcelain was built up on the coping with thickness of 1mm. For three point bending test, same alloys were cast into plates with 25±1×3±0.1×0.5±0.05mm. And porcelain was built up on alloys with 8±0.1×3×1.1±0.1mm size. Three point bending test was measured with a universal testing machine at a crosshead speed of 1.00mm/min. After fracture of porcelain, the morphologies of fractured surface were observed by using field-emission scanning electron microscopy (FE-SEM)

Interfacial Bonding and Fracture Phenomena between Porcelain and Metal Coping