In vitro Studies Regarding the Corrosion Resistance of NiCr and CoCr Types Dental Alloys

Prosthetic treatment of reduced partial edentation supposes the introduction of a foreign object into the patient's oral cavity, which implies an increased attention regarding the compatibility and the corrosion resistance of the used materials with the biologic environment. The aim of this study was to compare the corrosion resistance of six commercial samples of dental alloys from different suppliers (three types of nickel-chromium and three types of cobalt-chromium alloys) in artificial saliva Fusayama-Meyer with different pH: 2, 5 and 7, at room temperature (25 +/- 1 degrees C). The samples were tested electrochemically to determine their resistance to corrosion. The corrosion rates were obtained from the current-potential curves. The potentiodynamic curves of the dental alloys showed that dental alloys have variations of the corrosion parameters in all types of the studied artificial saliva. CCG have shown the lowest values of corrosion rate irrespective of the pH of artificial saliva.