Corrosion resistance and ion release of dental prosthesis of CoCr obtained by CAD-CAM milling, casting and laser sintering
Author
Padrós, Roberto
Gil Mur, Francisco Javier
Publication date
2020ISSN
2075-4701
Abstract
Corrosion resistance and ion release behavior have been evaluated for thirty dental restoration samples obtained by three different manufacturing systems: computer-aided design and manufacturing (CAD-CAM), traditional casting and laser sintering. The alloy used was the CoCr alloy (same batch) generally used in clinical dentistry. Corrosion resistance has been evaluated by electrochemical testing in an artificial saliva medium at 37 °C. Corrosion parameters such as critical current density (icr), corrosion potential (Ecorr), and passive current density (ip), have been determined. Cobalt and Chromium ions released from the different samples have also been analyzed in an artificial saliva medium at 37 °C by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) at different immersion times. The casted samples showed higher corrosion rates and ion-release levels. The CAD-CAM milled samples presented lower ion-release levels and better corrosion resistance due to the total solubility of the chemical elements in only one phase with the same chemical composition. This homogeneity avoids the formation of electrochemical corrosion. Moreover, the absence of defects and residual stresses increases the corrosion resistance. Casted and laser sintered prostheses have shown the presence of Cr, W, and Nb rich-precipitates which are detrimental to the corrosion resistance. These precipitates produce a decrease in the Cr content on the surface. It is well known that the corrosion resistance increases with the Cr content by the formation of Chromium oxide on the surface that increases passivation. Consequently, the decrease in Cr induces an increase in corrosion and ion release.
Document Type
Article
Document version
Accepted version
Language
English
Subject (CDU)
616.3 - Pathology of the digestive system. Complaints of the alimentary canal
Keywords
Pròtesis dentals
Odontologia
Làsers
Ions
Aliatges
Cobalt
Prótesis dentales
Odontología
Láseres
Iones
Aleaciones
Cobalto
Dental prosthetics
Odontology
Lasers
Ions
Alloys
Cobalt
Pages
12
Publisher
MDPI
Collection
10; 6
Is part of
Metals
Citation
Padrós, Roberto; Giner-Tarrida, Luís; Herrero-Climent, Mariano [et al.]. Corrosion resistance and ion release of dental prosthesis of CoCr obtained by CAD-CAM milling, casting and laser sintering. Metals, 2020, 10(6), p. 1-12. Disponible en: <https://www.mdpi.com/2075-4701/10/6/827/htm>. Fecha de acceso: 2 jul. 2020. DOI: 10.3390/met10060827
Grant agreement number
info:eu-repo/grantAgreement/MICINN/RTI2018-098075-B-C21
info:eu-repo/grantAgreement/MICINN/RTI2018-098075-B-C22
This item appears in the following Collection(s)
- Odontologia [245]
Rights
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/