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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructural, mechanical, and optical characterization of an experimental aging-resistant zirconia-toughened alumina (ZTA) composite

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Author(s):
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Lopes, A. C. O. [1] ; Coelho, P. G. [2, 3, 4] ; Witek, L. [2] ; Benalcazar Jalkh, E. B. [2, 1] ; Genova, L. A. [5] ; Monteiro, K. N. [6] ; Cesar, P. F. [6] ; Lisboa-Filho, P. N. [7] ; Bergamo, E. T. P. [1] ; Ramalho, I. S. [1] ; Campos, T. M. B. [8] ; Bonfantea, E. A. [1]
Total Authors: 12
Affiliation:
[1] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Al Octavio Pinheiro Brisola 9-75, Bauru, SP - Brazil
[2] NYU, Coll Dent, Dept Biomat & Biomimet, New York, NY - USA
[3] NYU Tandon Sch Engn, Mech & Aerosp Engn, New York, NY - USA
[4] NYU Langone Med Ctr, Hansjorg Wyss Dept Plast Surg, New York, NY - USA
[5] Inst Res Nucl Energy, Sao Paulo, SP - Brazil
[6] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo, SP - Brazil
[7] Sao Paulo State Univ, Dept Phys, Bauru, SP - Brazil
[8] Aeronaut Technol Inst ITA, Phys Dept, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 8
Document type: Journal article
Source: Dental Materials; v. 36, n. 12, p. E365-E374, DEC 2020.
Web of Science Citations: 0
Abstract

Objective. To evaluate the effect of aging on the microstructural, mechanical, and optical properties of an experimental zirconia-toughened alumina composite with 80%Al2O3 and 20%ZrO2 (ZTA Zpex) compared to a translucent zirconia (Zpex) and Alumina. Methods. Disc-shaped specimens were obtained by uniaxial and isostatic pressing the synthesized powders (n = 70/material). After sintering and polishing, half of the specimens underwent aging (20 h, 134 degrees C, 2.2 bar). Crystalline content and microstructure were evaluated using X-ray diffraction and scanning electron microscopy, respectively. Specimens underwent biaxial flexural strength testing to determine the characteristic stress, Weibull modulus, and reliability. Translucency parameter (TP) and Contrast ratio (CR) were calculated to characterize optical properties. Results. ZTA Zpex demonstrated a compact surface with a uniform dispersion of zirconia particles within the alumina matrix, and typical alumina and zirconia crystalline content. ZTA Zpex and alumina exhibited higher CR and lower TP than Zpex. ZTA Zpex and Zpex showed significantly higher characteristic stress relative to alumina. While aging did not affect optical and mechanical properties of ZTA Zpex and alumina, Zpex demonstrated a significant increase in translucency, as well as a in characteristic stress. Alumina reliability was significantly lower than others at 300 MPa, ZTA Zpex and Zpex reliability decreased at 800 MPa, except for aged Zpex. Significance. While aging did not affect the mechanical nor the optical properties of ZTA Zpex and alumina, it did alter both properties of Zpex. The results encourage further investigations to engineer ZTA as a framework material for long span fixed dental prostheses specially where darkened substrates, such as titanium implant abutments or endodontically treated teeth, demand masking. (C) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 16/17793-1 - Development and mechanical and optical characterization of 80% Al2O3 and 20% ZrO2 translucent composites for CAD/CAM monolithic prostheses
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 17/19362-0 - DEVELOPMENT, MECHANICAL AND OPTICAL CHARACTERIZATION OF 80% AL2O3 AND 20% ZRO2 ZTA COMPOSITES FOR CAD/CAM PROSTHESES
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 18/03072-6 - Experimental 70% Al2O3-30% ZrO2 composites: structural characterization and survival probability before and after aging
Grantee:Ernesto Byron Benalcazar Jalkh
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
Grantee:Estevam Augusto Bonfante
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 19/14798-0 - Development of pre-sintered ZTA 80% Al2O3/20% ZrO2 composite blocks for milling in CAD/CAM system
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 19/08693-1 - Experimental glass-infiltrated alumina-zirconia composites: characterization of microstructure, optical and mechanical properties.
Grantee:Edmara Tatiely Pedroso Bergamo
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 19/00452-5 - EXPERIMENTAL 70%Al2O3-30%ZrO2 ZTA COMPOSITES: MECHANICAL, ESTRUCTURAL AND TOPHOGRAPHICAL CHARACTERIZATION
Grantee:Ernesto Byron Benalcazar Jalkh
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/18818-8 - Multi-User Equipment approved in grant 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
Grantee:Estevam Augusto Bonfante
Support Opportunities: Multi-user Equipment Program