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Type: Artigo
Title: Tribocorrosion Behavior Of Biofunctional Titanium Oxide Films Produced By Micro-arc Oxidation: Synergism And Mechanisms
Author: Vieira Marques
Isabella da Silva; Alfaro
Maria Fernando; da Cruz
Nilson Cristino; Mesquita
Marcelo Ferraz; Takoudis
Christos; Sukotjo
Cortino; Mathew
Mathew T.; Ricardo Barao
Valentim Adelino
Abstract: Dental implants, inserted into the oral cavity, are subjected to a synergistic interaction of wear and corrosion (tribocorrosion), which may lead to implant failures. The objective of this study was to investigate the tribocorrosion behavior of Ti oxide films produced by micro-arc oxidation (MAO) under oral environment simulation. MAO was conducted under different conditions as electrolyte composition: Ca/P (0.3 M/0.02 M or 0.1 M/0.03 M) incorporated with/without Ag (0.62 g/L) or Si (0.04 M); and treatment duration (5 and 10 min). Non-coated and sandblasted samples were used as controls. The surfaces morphology, topography and chemical composition were assessed to understand surface properties. ANovA and Tukey's HSD tests were used (a=0.05). Biofunctional porous oxide layers were obtained. Higher Ca/P produced larger porous and harder coatings when compared to non coated group (p < 0.001), due to the presence of ruffle crystalline structure. The total mass loss (K-wc), which includes mass loss due to wear (K-w) and that due to corrosion (K-c) were determined. The dominant wear regime was found for higher Ca/P groups (K-c/K-w approximate to 0.05) and a mechanism of wear-corrosion for controls and lower Ca/P groups (K-c/K-w approximate to 0.11). The group treated for 10 min and enriched with Ag presented the lowest K-wc (p < 0.05). Overall, MAO process was able to produce biofunctional oxide films with improved surface features, working as tribocorrosion resistant surfaces. (C) 2015 Elsevier Ltd. All rights reserved.
Subject: Dental Implants
Bioactive Coatings
Editor: Elsevier Science BV
Citation: Journal Of The Mechanical Behavior Of Biomedical Materials. Elsevier Science Bv, v. 60, p. 8 - 21, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.jmbbm.2015.12.030
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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