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Mechanical properties and surface characterization of Ti-6Al-4V and Ti-35Nb-7Zz-5Ta casting alloys. Effects of fluoride exposure.

Grant number: 11/17861-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2012
Effective date (End): December 31, 2014
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Luis Geraldo Vaz
Grantee:Larissa Natiele Miotto
Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


Titanium and Ti-based alloys, especially Ti-6Al-4V, are widely accepted for the manufacture of orthopedic and dental implants due to their excellent mechanical, physical and chemical properties. However, a new generation of alloys, without aluminum and vanadium, has increased the interest in Medicine. In the oral environment, the success of these alloys depends on the response to thermal, ionic, microbiological and enzymatic interactions, as well as the resistance to masticatory stress. Thus, the aim of this study is to analyze the mechanical properties (Vickers hardness, tensile strength and tensile load cycling) of Ti-6Al-4V e Ti-35Nb-7Zr-5Ta alloys, and also characterize their surfaces by means of of chemical composition (X-ray Fluorescence Microscopy and/or Plasma Emission Spectrometry), the crystal structure (X-ray Diffraction), the phase morphology (Optical Microscopy), topography surface (Scanning Electron Microscopy and Atomic Force Microscopy) and roughness. Additionally, all the above analysis will be conducted after exposure to fluoride solution (NaF, 1500 ppm and pH 5.5) simulating a potentially unfavorable and commonly condition found in the oral environment. Two periods of exposure to fluoride will be simulated: 5 and 10 years.

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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)
MIOTTO, LARISSA N.; FAIS, LAIZA M. G.; RIBEIRO, ANA L. R.; VAZ, LUIS G. Surface properties of Ti-35Nb-7Zr-5Ta: Effects of long-term immersion in artificial saliva and fluoride solution. JOURNAL OF PROSTHETIC DENTISTRY, v. 116, n. 1, p. 102-111, JUL 2016. Web of Science Citations: 2.

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