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This study aimed to determine the effects of two different sandblasting conditions on the shear bon strength between electroformed Au substrates and porcelain,and characterize the interface between the Au substrate and porcelain.Electroformed Au specimens,0.3 mm thick with a cap-like shape were prepared.The prepared specimens were then divided into two different groups and each group was sandblasted with a different size of alumina grains(100 or 250 mm)prior to dental porcelain application.