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Corrosion Behaviour of the Co-Cr-Mo Dental Alloy in Solutions of Different Composition and Different pH Values

Nives Rinčić
Ivo Baučić
Slobodan Miko
Milan Papić
Esad Prohić

Puni tekst: engleski pdf 78 Kb

str. 99-106

preuzimanja: 1.996



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 exposed in vitro to either simulated saliva (phosphate
buffer pH 6.0), a highly acidic medium resembling the extreme conditions in the oral
cavity (phosphate buffer pH 3.5), and in lactic acid at pH which occurs under the 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 the ICP-AES. The
analysis showed that during one month cobalt (Co), chromium (Cr), iron (Fe), zinc (Zn)
and nickel (Ni) ions had been released from tested samples in all three 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).

Ključne riječi

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

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