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DEVELOPMENT, MECHANICAL AND OPTICAL CHARACTERIZATION OF 80% AL2O3 AND 20% ZRO2 ZTA COMPOSITES FOR CAD/CAM PROSTHESES

Grant number: 17/19362-0
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): November 24, 2017
Effective date (End): May 23, 2018
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Estevam Augusto Bonfante
Grantee:Adolfo Coelho de Oliveira Lopes
Supervisor abroad: Paulo Guilherme Goncalves Gomes Coelho
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
Research place: New York University, United States  
Associated to the scholarship:16/17793-1 - Development and mechanical and optical characterization of 80% Al2O3 and 20% ZrO2 translucent composites for CAD/CAM monolithic prostheses, BP.MS

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 80% alumina reinforced with 20% 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 an experimental translucent zirconia. 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 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.

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Scientific publications (7)
(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)
LOPES, A. C. O.; COELHO, P. G.; WITEK, L.; BENALCAZAR JALKH, E. B.; GENOVA, L. A.; MONTEIRO, K. N.; CESAR, P. F.; LISBOA-FILHO, P. N.; BERGAMO, E. T. P.; RAMALHO, I. S.; et al. Microstructural, mechanical, and optical characterization of an experimental aging-resistant zirconia-toughened alumina (ZTA) composite. Dental Materials, v. 36, n. 12, p. E365-E374, . (16/17793-1, 17/19362-0, 18/03072-6, 12/19078-7, 19/14798-0, 19/08693-1, 19/00452-5, 16/18818-8)
JALKH, ERNESTO BYRON BENALCAZAR; MONTEIRO, KELLI NUNES; CESAR, PAULO FRANCISCO; GENOVA, LUIS ANTONIO; BERGAMO, EDMARA T. P.; LOPES, ADOLFO COELHO DE OLIVEIRA; LIMA, ERICK; LISBOA-FILHO, PAULO NORONHA; CAMPOS, TIAGO MOREIRA BASTOS; WITEK, LUKASZ; et al. Aging resistant ZTA composite for dental applications: Microstructural, optical and mechanical characterization. Dental Materials, v. 36, n. 9, p. 1190-1200, . (19/08693-1, 19/00452-5, 17/19362-0, 18/03072-6, 12/19078-7, 16/17793-1, 16/18818-8)
DE OLIVEIRA LOPES, ADOLFO COELHO; MACHADO, CAMILA MOREIRA; BONJARDIM, LEONARDO RIGOLDI; PEDROSO BERGAMO, EDMARA TATIELY; RAMALHO, ILANA SANTOS; WITEK, LUKASZ; COELHO, PAULO GUILHERME; BONFANTE, ESTEVAM AUGUSTO. The Effect of CAD/CAM Crown Material and Cement Type on Retention to Implant Abutments. JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY, v. 28, n. 2, p. E552-E556, . (12/19078-7, 16/18818-8, 17/19362-0, 16/17793-1)
BENALCAZAR JALKH, E. B.; BERGAMO, E. T. P.; MONTEIRO, K. N.; CESAR, P. F.; GENOVA, L. A.; LOPES, A. C. O.; LISBOA FILHO, P. N.; COELHO, P. G.; SANTOS, C. F.; BORTOLIN, F.; et al. Aging resistance of an experimental zirconia-toughened alumina composite for large span dental prostheses: Optical and mechanical characterization. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 104, . (19/08693-1, 19/00452-5, 16/24165-7, 17/19362-0, 18/03072-6, 16/18657-4, 19/14798-0, 12/19078-7, 16/18818-8, 16/17793-1)
BENALCAZAR JALKH, E. B.; COELHO, P. G.; WITEK, L.; BERGAMO, E. T. P.; LOPES, A. C. O.; MONTEIRO, K. N.; CESAR, P. F.; GENOVA, L. A.; LISBOA-FILHO, P. N.; ABREU, J. L. B.; et al. Nanoscale physico-mechanical properties of an aging resistant ZTA composite. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 123, . (18/03072-6, 19/08693-1, 12/19078-7, 16/18818-8, 19/00452-5, 17/19362-0, 16/17793-1)
LOPES, A. C. O.; COELHO, P. G.; WITEK, L.; BENALCAZAR JALKH, E. B.; GENOVA, L. A.; MONTEIRO, K. N.; CESAR, P. F.; LISBOA FILHO, P. N.; BERGAMO, E. T. P.; RAMALHO, I. S.; et al. Nanomechanical and microstructural characterization of a zirconia-toughened alumina composite after aging. CERAMICS INTERNATIONAL, v. 45, n. 7, A, p. 8840-8846, . (12/19078-7, 17/19362-0, 16/17793-1, 16/18818-8, 18/03072-6)
RAMALHO, ILANA; WITEK, LUKASZ; COELHO, PAULO G.; BERGAMO, EDMARA; PEGORARO, LUIZ FERNANDO; BONFANTE, ESTEVAM A.. Influence of Abutment Fabrication Method on 3D Fit at the Implant-Abutment Connection. International Journal of Prosthodontics, v. 33, n. 6, p. 641-647, . (17/19362-0, 19/08693-1, 16/18818-8, 12/19078-7, 19/14798-0, 16/17793-1)

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