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Experimental 70% Al2O3-30% ZrO2 composites: structural characterization and survival probability before and after aging

Grant number: 18/03072-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2018
Effective date (End): February 28, 2022
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Estevam Augusto Bonfante
Grantee:Ernesto Byron Benalcazar Jalkh
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
Associated research grant:12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength, AP.JP
Associated scholarship(s):19/00452-5 - EXPERIMENTAL 70%Al2O3-30%ZrO2 ZTA COMPOSITES: MECHANICAL, ESTRUCTURAL AND TOPHOGRAPHICAL CHARACTERIZATION, BE.EP.DR

Abstract

Yttrium stabilized Tetragonal Zirconia Polycrystal (Y-TZP) instability at low temperature due to the tetragonal to monoclinic phase transformation can lead to Low Temperature Degradation (LTD) and compromise its mechanical properties. This project proposes the synthesis, structural characterization and survival probability analyses of polycrystalline Zirconia-Toughened-Alumina composites (ZTA) in 70% (Al2O3) - 30% (ZrO2) composition, before and after artificial aging. The ceramic powders will be formulated for uniaxial and isostatic pressing of disk shaped specimens divided in three experimental groups: 1) Alumina (n=105) 2) Translucent Zirconia - Zpex (n=105) and 3) ZTA-Zpex (n=105). After sintering and polishing, half of the specimens for each group will be aged in autoclave (134°C, 2.2 bar, 20 hours) to simulate the LTD process. The specimens will be characterized by XRD for analyses of the crystalline phases. The possible changes in the surface after aging will be characterized by SEM and interferometry (Sa, Sq, Sdr) and mechanically by nanoindentation (hardness and modulus of elasticity). The biaxial flexural strength (ISO 6872: 2015) will be evaluated before (n=30/group) and after aging (n=30/group), for knowledge of survival probability, Weibull modulus and characteristic strength. To evaluate the fatigue survival, accelerated life tests will be performed (n=18/group), followed by qualitative fractographic analysis. This proposal is part of the "jovem pesquisador" Award FAPESP 2012/19078-7 and presents a schedule for BEPE scholarship. (AU)

Scientific publications (9)
(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, ERNESTO B.; NETO, JUVENAL DE SOUZA; BERGAMO, EDMARA T. P.; MAIA, CAMILA F.; BONFANTE, ESTEVAM A. Mechanical testing of four-unit implant-supported prostheses with extensive pink gingiva porcelain: The dentogingival prostheses proof of concept. Journal of Esthetic and Restorative Dentistry, JAN 2021. Web of Science Citations: 0.
DE ARAUJO-JUNIOR, EVERARDO N. S.; BERGAMO, EDMARA T. P.; CAMPOS, TIAGO M. B.; JALKH, ERNESTO B. BENALCAZAR; LOPES, ADOLFO C. O.; MONTEIRO, KELLI N.; CESAR, PAULO F.; TOGNOLO, FERNANDA C.; TANAKA, RICARDO; BONFANTE, ESTEVAM A. Hydrothermal degradation methods affect the properties and phase transformation depth of translucent zirconia. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 112, DEC 2020. Web of Science Citations: 0.
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.; CAMPOS, T. M. B.; BONFANTEA, E. A. Microstructural, mechanical, and optical characterization of an experimental aging-resistant zirconia-toughened alumina (ZTA) composite. Dental Materials, v. 36, n. 12, p. E365-E374, DEC 2020. Web of Science Citations: 0.
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; COELHO, PAULO G.; BORGES, ANA FLAVIA SANCHES; BONFANTE, ESTEVAM A. Aging resistant ZTA composite for dental applications: Microstructural, optical and mechanical characterization. Dental Materials, v. 36, n. 9, p. 1190-1200, SEP 2020. Web of Science Citations: 0.
DE OLIVEIRA, PAULA GABRIELA FACIOLA PESSOA; BONFANTE, ESTEVAM A.; BERGAMO, EDMARA T. P.; DE SOUZA, SERGIO LUIS SCOMBATTI; RIELLA, LEONARDO; TORRONI, ANDREA; JALKH, ERNESTO B. BENALCAZAR; WITEK, LUKASZ; LOPEZ, CHRISTOPHER D.; ZAMBUZZI, WILLIAN FERNANDO; COELHO, PAULO G. Obesity/Metabolic Syndrome and Diabetes Mellitus on Peri-implantitis. TRENDS IN ENDOCRINOLOGY AND METABOLISM, v. 31, n. 8, p. 596-610, AUG 2020. Web of Science Citations: 0.
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.; PIZA, M. M. T.; BONFANTE, E. A. 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, APR 2020. Web of Science Citations: 0.
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.
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.; BONFANTE, E. A. Nanomechanical and microstructural characterization of a zirconia-toughened alumina composite after aging. CERAMICS INTERNATIONAL, v. 45, n. 7, A, p. 8840-8846, MAY 2019. Web of Science Citations: 2.
DE OLIVEIRA LINO, LUCAS FRACASSI; MACHADO, CAMILA MOREIRA; DE PAULA, VITOR GUARCONI; VIDOTTI, HUGO ALBERTO; COELHO, PAULO G.; BENALCAZAR JALKH, ERNESTO BYRON; PEGORARO, THIAGO AMADEI; BONFANTE, ESTEVAM AUGUSTO. Effect of aging and testing method on bond strength of CAD/CAM fiber-reinforced composite to dentin. Dental Materials, v. 34, n. 11, p. 1690-1701, NOV 2018. Web of Science Citations: 3.

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