Agradecimentos: The authors would like to thank University of Illinois at Chicago and Rush University Medical Center for providing the facilities to perform this study; Ducom Instruments for providing the tribometer facility; Rafael Parra from Univ Estadual Paulista (Sorocaba, Brazil) for his...

Agradecimentos: The authors would like to thank University of Illinois at Chicago and Rush University Medical Center for providing the facilities to perform this study; Ducom Instruments for providing the tribometer facility; Rafael Parra from Univ Estadual Paulista (Sorocaba, Brazil) for his contribution and support in Plasma Technology Laboratory; the Coordination for the Improvement of Higher Level Personnel (CAPES) from Brazil for the doctoral fellowship of the first author (PDSE Proc. 11838-13-2); the State of Sao Paulo Research Foundation (FAPESP) for the grant (#2013/08451-1); the National Science Foundation (NSF) for the grant #1067424 and the financial support from the NIH R03 AR064005

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)...

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 (α=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 rutile crystalline structure. The total mass loss (Kwc), which includes mass loss due to wear (Kw) and that due to corrosion (Kc) were determined. The dominant wear regime was found for higher Ca/P groups (Kc/Kw≈0.05) and a mechanism of wear-corrosion for controls and lower Ca/P groups (Kc/Kw≈0.11). The group treated for 10 min and enriched with Ag presented the lowest Kwc (p<0.05). Overall, MAO process was able to produce biofunctional oxide films with improved surface features, working as tribocorrosion resistant surface

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2013/08451-1

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