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Structural, mechanical, chemical and electrochemical characterization of experimental titanium alloys for dental implants

Grant number: 14/26853-2
Support type:Scholarships in Brazil - Master
Effective date (Start): April 01, 2015
Effective date (End): February 28, 2017
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Valentim Adelino Ricardo Barão
Grantee:Jairo Matozinho Cordeiro
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil


This study aim to investigate the structural, mechanical, chemical and electrochemical properties of experimental titanium (Ti) alloys with the addition of zirconium (Zr) and niobium (Nb). Alloys with the following composition (% in weight) will be developed: Ti5Zr, Ti10Zr, Ti35Nb5Zr e Ti35Nb10Zr. Commercially pure titanium (cp-Ti) and Ti alloy with aluminium (Al) and vanadium (V) (Ti6Al4V) will be used as controls. The Ti discs (15 mm in diameter and 2 mm in thickness) will be characterized by microstructural analysis, surface roughness (Ra, Rq, Rt, Rz), Vicker's microhardness, nanohardness, elastic modulus, Atomic Force Microscope (AFM), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-Ray Photoelectron Spectroscopy (XPS), X-Ray Diffraction Analysis (XRD), wettability and surface free energy. For the electrochemical assay, standard tests such as open circuit potential (3,600 sec), electrochemical impedance spectroscopy (frequency range from 100 KHz to 5 mHz with applied sinusoidal potential of 10 mV versus its corrosion potential), and potentiodynamic tests (potential from -0.8 V to 1.8 V in a scan rate of 2 mV/sec) will be conducted in body fluid solution (pH 7,4) using a potentiostat with a 3-electrode system. The capacitance (Cdl) and polarization resistance (Rp) of the alloys layer will be determined by the most appropriate electrical circuit. The Tafel's method will be used to ascertain the corrosion current density (Icorr) and corrosion potential (Ecorr). The passivation current density (Ipass) will be the amount of current in the transition between the active and passive region in the polarization curve of the alloys. Quantitative data will be statistically analyzed at a significant level of 5%. The number of samples for each assay will be determined by a pilot study and submitted to the power test. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PANTAROTO, HELOISA NAVARRO; AMORIM, KARINA PINTAUDI; CORDEIRO, JAIRO MATOZINHO; SOUZA, JOAO GABRIEL S.; RICOMINI-FILHO, ANTONIO PEDRO; RANGEL, ELIDIANE C.; RIBEIRO, ANA LUCIA R.; VAZ, LUIS GERALDO; BARAO, VALENTIM A. R. Proteome analysis of the salivary pellicle formed on titanium alloys containing niobium and zirconium. BIOFOULING, v. 35, n. 2 MAR 2019. Web of Science Citations: 1.
CORDEIRO, JAIRO M.; BELINE, THAMARA; RIBEIROC, ANA LUCIA R.; RANGEL, ELIDIANE C.; DA CRUZ, NILSON C.; LANDERS, RICHARD; FAVERANI, LEONARDO P.; VAZ, LUIS GERALDO; FAIS, LAIZA M. G.; VICENTE, FABIO B.; GRANDINI, CARLOS R.; MATHEW, MATHEW T.; SUKOTJO, CORTINO; BARAO, VALENTIM A. R. Development of binary and ternary titanium alloys for dental implants. Dental Materials, v. 33, n. 11, p. 1244-1257, NOV 2017. Web of Science Citations: 25.
CORDEIRO, JAIRO M.; BARAO, VALENTIM A. R. Is there scientific evidence favoring the substitution of commercially pure titanium with titanium alloys for the manufacture of dental implants?. Materials Science & Engineering C-Materials for Biological Applications, v. 71, p. 1201-1215, FEB 1 2017. Web of Science Citations: 48.

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