Tribocorrosion behavior of biofunctional titanium oxide films produced by micro-arc oxidation: Synergism and mechanisms

Autor(es)

Vieira Marques, Isabella da Silva ^{[1, 2, 3]} ; Alfaro, Maria Fernando ^[2] ; da Cruz, Nilson Cristino ^[4] ; Mesquita, Marcelo Ferraz ^[3] ; Takoudis, Christos ^{[2, 5, 6]} ; Sukotjo, Cortino ^{[7, 2]} ; Mathew, Mathew T. ^{[8, 2]} ; Ricardo Barao, Valentim Adelino ^[3]

Afiliação do(s) autor(es)

^[1] IBTN Br Inst Biomat Tribocorros & Nanomed, Brazilian Branch, Sao Paulo - Brazil

^[2] IBTN, Chicago, IL - USA

^[3] Univ Campinas UNICAMP, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Av Limeira 901, BR-13414903 Sao Paulo - Brazil

^[4] Univ Estadual Paulista UNESP, Engn Coll, Lab Technol Plasmas, Av Tres Marco 511, BR-18087180 Sao Paulo - Brazil

^[5] Univ Illinois, Dept Chem Engn, 851 S Morgan St, SEO 218, Chicago, IL 60607 - USA

^[6] Univ Illinois, Dept Bioengn, 851 S Morgan St, SEO 218, Chicago, IL 60607 - USA

^[7] Univ Illinois, Dept Restorat Dent, Coll Dent, 801 S Paulina, Chicago, IL 60612 - USA

^[8] Rush Univ, Med Ctr, Dept Orthoped Surg, 1611 W Harrison, Chicago, IL 60612 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 60, p. 8-21, JUL 2016.
• Citações Web of Science: 18

Resumo

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. (AU)

• Processo FAPESP: 13/08451-1 - Estabilidade eletroquímica do Ticp com superfícies modificadas por ácido e jateamento com óxido de alumínio
• Beneficiário: Valentim Adelino Ricardo Barão
• Modalidade de apoio: Auxílio à Pesquisa - Regular