Influence of the casting processing route on the corrosion behavior of dental alloys

Autor(es)

Galo, Rodrigo ^[1] ; Rocha, Luis Augusto ^[2] ; Faria, Adriana Claudia ^[1] ; Silveira, Renata Rodrigues ^[1] ; Ribeiro, Ricardo Faria ^[1] ; Chiarello de Mattos, Maria da Gloria ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Dent Ribeirao Preto, Dept Dent Mat & Prosthodont, BR-14040904 Ribeirao Preto - Brazil

^[2] Univ Minho, Ctr Mech & Mat Technol CT2M, Guimaraes - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Materials Science & Engineering C-Materials for Biological Applications; v. 45, p. 519-523, DEC 1 2014.
• Citações Web of Science: 8

Resumo

Casting in the presence of oxygen may result in an improvement of the corrosion performance of most alloys. However, the effect of corrosion on the casting without oxygen for dental materials remains unknown. The aim of this study was to investigate the influence of the casting technique and atmosphere (argon or oxygen) on the corrosion behavior response of six different dental casting alloys. The corrosion behavior was evaluated by electrochemical measurements performed in artificial saliva for the different alloys cast in two different conditions: arc melting in argon and oxygen-gas flame centrifugal casting. A slight decrease in open-circuit potential for most alloys was observed during immersion, meaning that the corrosion tendency of the materials increases due to the contact with the solution. Exceptions were the Co-based alloys prepared by plasma, and the Co-Cr-Mo and Ni-Cr-4Ti alloys processed by oxidized flame, in which an increase in potential was observed. The amount of metallic ions released into the artificial saliva solution during immersion was similar for all specimens. Considering the pitting potential, a parameter of high importance when considering the fluctuating conditions of the oral environment, Co-based alloys show the best performance in comparison with the Ni-based alloys, independent of the processing route. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 03/01775-4 - Estudo da biocompatibilidade de ligas metálicas odontológicas e do Ti CP obtidos por fundição
• Beneficiário: Ricardo Faria Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular