Abstract :
The corrosion and /or dissolution rate of various dental amalgams were studied in 0.9 wt,sodium chloride (NaCl) solution, artificial saliva and rigerʹs soulution. Specimens were prepared from three High- copper dental amalgams having different particle shape, various mercury- to- alloy ratio and different percentages of silver, thin and copper. Potentiodynamic polarization technique was employed to draw cathodic and anodic polarization curves, from which the corrosion potentials and corrosion current densities were calculated. The corrosion potential and the corrosion current density of each amalgam was found to be affected by the nature of electrolyte used, as well as the primmersion time. However, the order of corrosion potetials and corrosion current densities of the three dental amalgams examined, was found to be independent of the electrolyte used.
