Functionalization of an experimental Ti-Nb-Zr-Ta alloy with a biomimetic coating produced by plasma electrolytic oxidation

Made available in DSpace on 2019-10-06T15:57:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-05 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Universidade Estadual Paulista This study developed an experimental quaternary titanium (Ti) alloy and evaluated its surface properties and electrochemical stability. The viability for a biofunctional surface treatment was also tested. Ti-35Nb-7Zr-5Ta (wt%) alloy was developed from pure metals. 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). The experimental alloy was successfully synthesized and exhibited β microstructure. PEO treatment created a porous surface with increased roughness, surface free energy, hardness and electrochemical stability (p < 0.05). For the machined surfaces, the Ti-Nb-Zr-Ta alloy presented the lowest hardness and elastic modulus (p < 0.05) and displayed greater polarization resistance relative to cpTi. Only PEO-treated cpTi and Ti-Al-V alloys exhibited anatase and rutile as crystalline structures. The β experimental Ti-Nb-Zr-Ta alloy seems to be a good alternative for the manufacture of dental implants, since it presents elastic modulus closer to that of bone, feasibility for surface treatment, electrochemical stability and absence of toxic elements. University of Campinas (UNICAMP) Piracicaba Dental School Department of Prosthodontics and Periodontology, Av. Limeira, 901 Institute of Biomaterials Tribocorrosion and Nanomedicine (IBTN) Faculdade de Ciências do Tocantins (FACIT), Av. José de Brito, 730 Centro Universitário Tocantinense Presidente Antônio Carlos (UNITPAC), Av. Filadélfia, 568 São Paulo State University (UNESP) Engineering College Laboratory of Technological Plasmas, Av. Três de Março, 511 Univ. Estadual Paulista (UNESP) Araraquara Dental School Department of Dental Materials and Prosthodontics, R. Humaitá São Paulo State University (UNESP) Engineering College Laboratory of Technological Plasmas, Av. Três de Março, 511 Univ. Estadual Paulista (UNESP) Araraquara Dental School Department of Dental Materials and Prosthodontics, R. Humaitá FAPESP: 2016/11470-6 FAPESP: 2017/01320-0