Studies on cytotoxicity of nickel ions using C3H10T1/2 fibroblast cells

Cytotoxicity of Ni ions were examined using C3H mouse derived 10T1/2 fibrob last cells. It became evident that Ni ions had dose-dependent cytotoxicity. The cell number incubated in DME medium containing 0.04 mM/L Ni ion for 6 days was reduced to half that in control DME medium without Ni. The cell to tally disappeared in DME medium containing 2 mM/L Ni ion. The dissolution o f Ni ions from Ni-containing metallic restorations must be lower than these concentration levels so that oral tissues might not be damaged. No neoplas tic transformation was found on all cells examined.