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International Journal of Electrochemistry
Volume 2011, Article ID 574502, 7 pages
http://dx.doi.org/10.4061/2011/574502
Research Article

Electrochemical Tests to Evaluate the Stability of the Anodic Films on Dental Implants

1Laboratório de Materiais Bicompatíveis, Departamento de Engenharia Mecânica, Universidade Federal do Paraná, Jardim das Américas, CP 19081, 81531-990 Curitiba, PR, Brazil
2Laboratório Interdisciplinar de Cerâmica, Departamento de Química, Universidade Federal de São Carlos, Rod. Washungton Luiz, km 235, CP 676, 13565-905 São Carlos, SP, Brazil

Received 12 January 2011; Revised 12 April 2011; Accepted 2 May 2011

Academic Editor: Davood Nematollahi

Copyright © 2011 C. E. B. Marino and L. H. Mascaro. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The stability of anodic films potentiodynamically grown on titanium, titanium-grade 2, and Ti6Al4V alloy was studied in a simulated physiological electrolyte, up to 8.0 V, and at room temperature to determine the corrosion resistance levels of dental implants. In PBS (phosphate buffer saline) solution, thin titanium oxide films protect the surface of the Ti6%Al4%V alloy up to 6.0 V, pure Ti up to 8.0 V, and Ti-grade 2 up to 1.5 V. At more positive potentials, localized corrosion starts to occur possibly due to the alloy elements (Ti6Al4V-V and Al) and variable levels of interstitials (Ti-grade 2: C, N, and Fe, mainly). When the biomaterials were submitted to open-circuit conditions, in artificial saliva, the worst corrosion resistance was observed in dental implant (Ti-grade 2), according to the open-circuit potential values and reconstruction rate analysis of these oxide films. The XPS spectra revealed TiO2 oxide as the main phase in the barrier oxide film coating the dental implant.