title: Influence of the casting processing route on the corrosion behavior of dental alloys.
abstract: 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.
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil. Electronic address: rogallo@usp.br.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Galo
authors.affiliation: CT2M - Centre for Mechanical and Materials Technologies, Universidade do Minho, Campus de Azurem, Guimarães, Portugal.
authors.forename: Luis Augusto
authors.initials: LA
authors.lastname: Rocha
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil.
authors.forename: Adriana Claudia
authors.initials: AC
authors.lastname: Faria
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil.
authors.forename: Renata Rodrigues
authors.initials: RR
authors.lastname: Silveira
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil.
authors.forename: Ricardo Faria
authors.initials: RF
authors.lastname: Ribeiro
authors.affiliation: Department of Prosthodontics and Dental Materials, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil.
authors.forename: Maria da Gloria Chiarello
authors.initials: Mda G
authors.lastname: de Mattos
mesh_terms: D001128:Argon / Q000737:chemistry; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D003735:Dental Casting Technique; D055664:Electrochemical Techniques; D010100:Oxygen / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry
chemical_list: D003722:Dental Alloys; D012464:Saliva, Artificial; D001128:Argon; D010100:Oxygen
keywords: Casting; Corrosion; Dental alloys