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Type: Artigo
Title: Surface-treated Commercially Pure Titanium For Biomedical Applications: Electrochemical, Structural, Mechanical And Chemical Characterizations
Author: Ogawa
Erika S.; Matos
Adaias O.; Beline
Thamara; Marques
Isabella S. V.; Sukotjo
Cortino; Mathew
Mathew T.; Rangel
Elidiane C.; Cruz
Nilson C.; Mesquita
Marcelo F.; Consani
Rafael X.; Barao
Valentim A. R.
Abstract: Modified surfaces have improved the biological performance and biomechanical fixation of dental implants compared to machined (polished) surfaces. However, there is a lack of knowledge about the surface properties of titanium (Ti) as a function of different surface treatment. This study investigated the role of surface treatments on the electrochemical, structural, mechanical and chemical properties of commercial pure titanium (cp-Ti) under different electrolytes. Cp-Ti discs were divided into 6 groups (n = 5): machined (M-control); etched with HCl + H2O2 (Cl), H2SO4 + H2O2 (5); sandblasted with Al2O3 (Sb), Al2O3 followed by HCl + H2O2 (SbCl), and Al2O3 followed by H2SO4 + H2O2 (SbS). Electrochemical tests were conducted in artificial saliva (pHs 3; 6.5 and 9) and simulated body fluid (SBF-pH 7.4). All surfaces were characterized before and after corrosion tests using atomic force microscopy, scanning electron microscopy, energy dispersive microscopy, X-ray diffraction, surface roughness, Vickers microhardness and surface free energy. The results indicated that Cl group exhibited the highest polarization resistance (R-p) and the lowest capacitance (Q) and corrosion current density (I-corr) values. Reduced corrosion stability was noted for the sandblasted groups. Acidic artificial saliva decreased the R-p values of cp-Ti surfaces and produced the highest I-corr values. Also, the surface treatment and corrosion process influenced the surface roughness, Vickers microhardness and surface free energy. Based on these results, it can be concluded that acid-etching treatment improved the electrochemical stability of cp-Ti and all treated surfaces behaved negatively in acidic artificial saliva. (C) 2016 Elsevier B.V. All rights reserved.
Subject: Titanium
Electrochemical Impedance Spectroscopy
Dental Implant
X-ray Diffraction
Editor: Elsevier Science BV
Citation: Materials Science And Engineering: C-materials For Biological Applications. Elsevier Science Bv, v. 65, p. 251 - 261, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.msec.2016.04.036
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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