In this study, porcelain bond strength to three different alloys of Gold-base, pd-Ag and base-Metal were compared and the effect of repeated porcelain sintering on bond strength was evaluated. The obtained results showed best bond strength of porcelain with Gold-base alloy. Pd-Ag and Base-metal alloys showed less strength respectively. During repeated sintering of porcelain, bond strength has not changed in Base-metal and Gold-base alloys while it was weakened in pd-Ag alloy.
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