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Title: 0361 - Synthesis of an Experimental Quaternary Titanium Alloy for Biomedical Application

Authors:

Valentim Barão (Presenter)
University of Campinas (UNICAMP)

Jairo Cordeiro, University of Campinas (UNICAMP)
Ana Lúcia Ribeiro, Faculdade de Ciências do Tocantins (FACIT)
Bruna Nagay, University of Campinas (UNICAMP)
Elidiane Rangel, Univ Estadual Paulista (UNESP)
Nilson da Cruz, Univ Estadual Paulista (UNESP)

Abstract:

Objectives: This study developed an experimental quaternary titanium (Ti) alloy containing niobium (Nb), zirconium (Zr) and tantalum (Ta), and evaluated its surface properties and electrochemical stability. The viability for a biofunctional surface treatment was also tested.

Methods: Ti-35Nb-7Zr-5Ta (wt%) alloy was developed from pure metals and machined in discs (10x2 mm). Commercially-pure titanium (cpTi) and Ti-6Al-4V were used as controls. All groups had two surface conditions: untreated (machined surface) and modified by plasma electrolytic oxidation (PEO) (treated surface). Topography, chemical composition, crystallography, roughness, surface free energy, hardness and elastic modulus were assessed to surface characterization. The electrochemical behavior was conducted in a body fluid solution (pH 7.4) using a 3-electrode standard method. Data were evaluated through 1-way ANOVA and Tukey HSD test (α=0.05).

Results: The experimental Ti-Nb-Zr-Ta was successfully synthetized and exhibited β microstructure. PEO treatment created a porous surface containing calcium and phosphorus that was responsible for a statistically significantly increase of the roughness, surface free energy, hardness and electrochemical stability of the treated surfaces (p<0.05). For the machined surfaces, Ti-Nb-Zr-Ta alloy presented the lowest hardness and elastic modulus (p<0.05) and tended to display greater polarization resistance relative to cpTi. PEO treated cpTi and Ti-Al-V alloy exhibited anatase and rutile as crystalline structures while the experimental alloy exhibited amorphous phase.

Conclusions: The β experimental Ti-Nb-Zr-Ta alloy seems to be a good alternative for the manufacture of dental implants as it presents elastic modulus closer to bone, feasibility for surface treatment, electrochemical stability and absence of toxic elements.

This abstract is based on research that was funded entirely or partially by an outside source:
The Sao Paulo Research Foundation - FAPESP (grant number 2016/11470-6)

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: None

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