engleski

Corrosion behaviour of the Co-Cr-Mo dental alloy in solutions of different composition and different pH values

The purpose of this study was to examine how Co-Cr-Mo dental alloy behaves in the solutions of different pH value and different composition over a relatively long period of time. Co-Cr-Mo dental alloy was in vitro to either simulated saliva (phosphate pH 6.0), a highly acidic medium resembling the extreme conditions in the oral cavity (phospate buffer pH 3.5), and in lactic acid at pH which occurs under dental plaque (lactic acid pH 3.5). The alloy samples were immersed in these three solution for 1, 2, 3, 4, 5, 6, 7, 14, 21, and 30 days. Solutions were analysed with ICP-AES. The analysis showd that during one month cobalt (Co), chromium (Cr), iron (Fe), zinc (Zn) and nickel (Ni) ions had been released from tested samples in all tree solutions. The results of this study indicate that the leaching of the Co, Cr, Fe, Zn, and Ni ions in the solution was dependent both upon the nature of the solution in wich the alloy was immersed and the duration of the immersion (p<0.001)

pH value; corrosion of Co-Cr-Mo alloy; time of exposure

nije evidentirano