RESEARCH ON THE SURFACE OF THE DENTAL ALLOYS WITH COBALT-CROM BASE

Willi Andrei URICIUC, Horaţiu VERMEŞAN, Adrian Ioan BOTEAN, Liviu NISTOR, Catalin POPA

Abstract


Removable parts assemblies are key that ensure the resistance of combined dental prosthetic works. The main problem regarding these dental prosthetic works in combining the two components as parts of the assembly. Dental alloys are considered biomaterials due to the fact, that they develop on their surface a passive oxide film that blocks the interaction with the environment in which they are immersed, thus, having an anticorrosive behaviour. In this study we assessed three Co-Cr base alloys: Co-Cr-Mo, Co-Cr-W and Co-Cr-Mo-W alloy. The surface of the samples was polished to the mirror texture, by mechanical processing using specific tools and another surface was sandblasted. The surfaces was heat treated at high temperature (HTO) and continues (CTO). The pieces were prepared for the electrochemical behaviour testes (OCP- open circuit potential, Tafel diagrams and EIS–electro impedance spectroscopy) using the Electrochemical Laboratory Voltalab PGZ100 and the results were processed with a special Voltamaster 4 soft. The samples were layered with ceramic and mechanically loaded for simple bending through universal testing machine Instron 3366 and analysed by the digital image correlation method with Q400 system. According to the differences between the values obtained by electrochemical testes, Co-Cr-W alloy had the highest thermodynamic stability. These differences highlighted the tendencies of materials to passivation in saliva. This is a self-protection ability of the material that is active from the design stage. The oxide on the surface of Co-Cr base alloy is an elastic buffer between alloy’s structure and the environment where functions as a biomaterial.

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References


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