Objective: This in vitro study compared the shear bond strength of porcelain to metal alloys (NiCr and CoCr) with or without an intermediate layer of gold. Methods: Twenty metallic structures (4.0mm in diameter, 5.0mm thick) of each alloy were casted and abraded with 250mm aluminum oxide. The bonding agent and gold bonding was applied and fired at 900¢ªC/1min on half of them. After opaquing, dentin porcelain was applied using Teflon matrix and the specimens were fired according to the manufacturer°¯s recommendations. Shear bond strength tests were performed by using an universal testing machine at a crosshead speed of 5mm/min. Results: Data were statistically analyzed {ANOVA two-way) and the results indicated that NiCr alloy supported higher loads than CoCr alloy when arranged with the porcelain (64.62MPa and 52.52MPa, respectively). The intermediate layer of gold did not influence the bond strength significantly (p=.05}. Conclusions: Considering the evaluated groups, the highest average was achieved when the gold layer was applied onto NiCr alloy although more researches are still needed to apply the system.

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