an investigation on metallic ion release from four dental casting alloys

statement of problem: element release from dental casting alloys into the oral environment is of clinical concern and is considered to be a potential health problem to all patients. purpose: the aim of this study was to investigate the metallic ion release of four base metal alloys. materials and methods: two ni-cr (minalux and supercast) and two co-cr alloys (minalia and wironit) were examined. nine specimens of each type were prepared in 13×11×1.4 mm dimensions and each of the four alloys (3 specimens per group) were conditioned in artificial saliva at 37ْ c for one, three and seven days. the conditioning media were analyzed for element-release using inductive coupled plasma atomic emission spectrophotometer (icpaes). collected data were statistically analyzed using anova and duncan multiple range test (p< 0.05). results: the greatest amount of element release was seen after seven days (134.9 ppb supercast, 159.2 ppb minalux, 197.2 ppb minalia, and 230.2 ppb wironit). there was a significant difference between the released elements from the alloys after the three conditioning times (p<0.001). conclusion: element release from the studied alloys is proportional to the conditioning time. the ni-cr alloys tested in this investigation were more resistant to corrosion as compared to the co-cr alloys in artificial saliva. supercast had the highest corrosion resistance.