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Experimental 70%Al2O3-30%ZrO2 ZTA composites: mechanical, estructural and TOPHOGRAPHICAL characterization

Grant number: 19/00452-5
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): April 25, 2019
Effective date (End): April 24, 2020
Field of knowledge:Health Sciences - Dentistry
Principal Investigator:Estevam Augusto Bonfante
Grantee:Ernesto Byron Benalcazar Jalkh
Supervisor abroad: Paulo Guilherme Goncalves Gomes Coelho
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
Local de pesquisa : New York University, United States  
Associated to the scholarship:18/03072-6 - Experimental 70% Al2O3-30% ZrO2 composites: structural characterization and survival probability before and after aging, BP.DR

Abstract

Yttrium tetragonal zirconia polycristal (Y-TZP) is a promising material that presents hydrothermal instability at low temperature due to metastable transformation of the tetragonal to monoclinic phase. This may lead to low temperature degradation (LTD), eventually compromising the mechanical properties and reliability of prosthetic treatments in the long-term. This project aims to innovate in the synthesis of a polycrystalline composite comprised by 70% alumina reinforced with 30% translucent (40 nanometer particle size) zirconia (ZTA - zirconia toughened alumina) and to characterize its mechanical properties in the nanoscale by nanoindentation, to assess its homogeneity throughout its bulk when compared to experimental translucent zirconia and alumina groups. The specimens will be evaluated by nanoindentation testing, before and after a simulated LTD challenge. Surface 3D properties (Sa, Sq) will be characterized by interferometry to detect potential alterations such as grain extrusion after simulated LTD. The overall aim of the project is to develop a polycrystalline composite for dentistry that meets the best properties of both alumina and zirconia resulting in a material with improved mechanical resistance compared to alumina and more resistant to LTD compared to zirconia. Nanoindentation and interferometry testing are the proposed methodology to be performed at the Department of Biomaterials and Biomimetics, New York University (NYU), since sample preparation, equipment, and trained faculty will be available for successful project completion. The BEPE phase of the project, as described in the ongoing FAPESP PhD scholarship (2018/03072-6), will be of utmost importance considering that subsequent testing to be performed in Brazil rely on the understanding of the experimental materials properties at the nanoscale, which could be accurately performed and interpreted by equipments and faculty located at NYU. In addition, the data collected in this BEPE proposal would highly enrich the grant Jovem Pesquisador (#2012-19078-7) since it would validate the methods under use for polycrystalline composite fabrication.

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)
BENALCAZAR JALKH, E. B.; MACHADO, C. M.; GIANINNI, M.; BELTRAMINI, I; PIZA, M. M. T.; COELHO, P. G.; HIRATA, R.; BONFANTE, E. A. Effect of Thermocycling on Biaxial Flexural Strength of CAD/CAM, Bulk Fill, and Conventional Resin Composite Materials. Operative Dentistry, v. 44, n. 5, p. E254-E262, SEP-OCT 2019. Web of Science Citations: 1.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.