The aim of this study was to investigate and compare the roughening effects of different surface treatments on different exposed surfaces of metal and ceramic restorations (porcelain, metal and metal/porcelain surfaces). 135 specimens were prepared for three surface groups; having 45 specimens for each group. Surface treatments were air abrasion alone or in combination with hydrofluoric acid, or phosphoric acid, burs alone or in combination with hydrofluoric acid, or phosphoric acid, hydrofluoric acid alone, and phosphoric acid alone. Statistical analysis showed significant differences between some of the different surface treatments on the same exposed surface of metal ceramic (MC) restoration as well as among the three exposed surfaces of MC restoration.
Metal, Porcelain, Surface treatments, Phosphoric acid, Hydrofluoric acid.