engleski

In Vitro Corrosion Behaviour of Dental Co-Cr Alloys

The oral environment significantly affects the corrosion of dental alloys. The fluctuations in temperature, the presence of electrolyte, changes in pH because of diet, variations in oxygen pressure and the decomposition of food all contribute to this process. Corrosion of dental alloys may result in biological, functional and aesthetic effects. In addition, the corrosion process releases metal ions which may then come in contact with cells and tissues in the immediate environment, or be distributed throughout the body, mainly to intenstinal canal. If these ions are not biocompatible, and if they are absorbed in sufficient quantity, the organism may be injured. For the construction of dental prosthesis strongly depends on their corrosion resistance. In this study two experimental Co-Cr-X (X-Mo, Ni) alloys have been tested in a "simulated" oral environment (Ringer's solution). These cobalt based alloys are compared to conventional dental materials (Wironit, Permite) and to pure titanium whose alloys are increasingly attracting attention for use as biomaterials. Polarization curves and relevant parameters obtained allow a clear differentiation between the metals. It was shown that passivating ability of Mo-containing alloys is more pronounced than that of Ni-containing alloys. Furthermore, titanium has shown the dominating pitting resistance while filler alloy Ag-amalgam displayed higher anodic activity.

corrosion; dental Co-Cr alloys; oral environment

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