INTERACTION OF DENTAL AND MAXILLOFACIAL KERADENT-1 ALLOY WITH ORAL CAVITY ELECTROLYTE

The methods of potentiodynamic polarization curves and quantitative Auger electron spectroscopy are used to establish the formation of a protective multilayer film in the interaction of dental and maxillofacial Keradent-1 alloy with the oral cavity electrolyte (3% NaCl solution). It is shown that the first (inner) part of the protective film (30 nm thick) represents a solid solution of oxygen in the metals of the alloy and the outer part of the film consists of three layers: CoO oxide (5 nm thick) at the boundary with the solid solution of oxygen, a mixture of CrO and CoO oxides (3 nm thick) in the middle, and Cr2CoO4 spinel (2 nm thick) in the outer sublayer. The experiment and calculations using the Faraday law show the number of Cr3+, Co2+, and Ni2+ ions that pass into the solution during electrolysis. These numbers are almost one three-hundredth of the admissible concentrations of these metals in the oral cavity.