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Synthesis of an ATZ nanocomposite (80%ZrO2-20%Al2O3) and microstructural, optical and survival characterization before and after aging

Grant number: 20/16500-6
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): October 01, 2021
Effective date (End): March 31, 2022
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Estevam Augusto Bonfante
Grantee:Mariana Miranda de Toledo Piza
Host 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


Polycrystalline Tetragonal Zirconia stabilized by 3 mol% of Yttria (3Y-TZP) is a promising material in dentistry, however its hydrothermal instability has motivated innovations in the area. It is known that 3Y-TZP can present degradation at low temperatures (DBT), resulting in changes in its properties. Thus, this study seeks to continue the FAPESP project 2018/19094-9 inserted in the aid Young Researcher 2012/19078-7, in the synthesis line of ATZ (80% ZrO2 -20% Al2O3, Alumina-Toughened Zirconia) having as differential the synthesis of an ATZ from nanometric powders, where microstructural, optical and survival characterization will be carried out, before and after being subjected to aging. The objective is to develop a composite with increased mechanical properties and less susceptibility to DBT when compared to that described in the proposal FAPESP 2018/19094-9. 120 specimens of ATZ nano will be prepared, all in disk format and final dimensions of 12mm in diameter and 1mm in thickness, via uniaxial and isostatic pressing. The samples will be divided into 3 groups: ATZi (immediate), ATZea (aged in autoclave), ATZer (aged in hydrothermal reactor). After sintered and polished, the groups ATZea and ATZer, will be submitted to the aging protocol for 25h, at 134ºC and 2.2 bars, simulating the effects of DBT. The optical properties will be evaluated (n=10/group) in a spectrophotometer to obtain values of contrast ratio and translucency parameter. The biaxial flexural strength test (ISO 6872:2015) (n=30/group) and fractographic analysis will be performed to calculate the probability of survival, Weibull modulus and characteristic strength. The crystalline phases will be observed by X-ray diffraction (XRD) (n=5/group).

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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)
BERGAMO, EDMARA T. P.; LOPES, ADOLFO C. O.; CAMPOS, TIAGO M. B.; AMORIM, PEDRO HENRIQUE; COSTA, FABIO; BENALCAZAR-JALKH, ERNESTO B.; DE CARVALHO, LAURA F.; ZAHOUI, ABBAS; PIZA, MARIANA M. T.; GUTIERRES, ELIEZER; et al. Probability of survival and failure mode of endodontically treated incisors without ferrule restored with CAD/CAM fiber-reinforced composite (FRC) post-cores. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 136, p. 10-pg., . (21/06730-7, 19/00452-5, 20/12874-9, 12/19078-7, 21/08018-2, 19/14798-0, 16/18818-8, 20/16500-6, 22/07157-1, 18/03072-6)
BERGAMO, EDMARA T. P.; CAMPOS, TIAGO M. B.; PIZA, MARIANA M. T.; GUTIERREZ, ELIEZER; LOPES, ADOLFO C. O.; WITEK, LUKASZ; COELHO, PAULO G.; CELESTRINO, MARCOS; CARVALHO, LAURA F. DE; BENALCAZAR, ERNESTO B.; et al. Temporary materials used in prosthodontics: The effect of composition, fabrication mode, and aging on mechanical properties. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 133, p. 10-pg., . (20/12874-9, 20/16500-6, 21/06730-7, 19/08693-1, 22/07157-1, 21/08018-2, 19/14798-0, 16/18818-8)
GOULART, CELSO ANTONIO; PIZA, MARIANA MIRANDA DE TOLEDO; CAMPOS, TIAGO MOREIRA BASTOS; BONFANTE, ESTEVAM AUGUSTO; FILHO LISBOA, PAULO NORONHA. Y-TZP nanostructures with non-homogeneous yttria distribution for improved hydrothermal degradation resistance and mechanical properties. CERAMICS INTERNATIONAL, v. 49, n. 13, p. 13-pg., . (21/06730-7, 20/12874-9, 22/05496-3, 21/04697-2, 20/16500-6)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PIZA, Mariana Miranda de Toledo. Synthesis of an ATZ nanocomposite (80%ZrO220%Al2O3) and microstructural, optical and survival characterization before and after aging. 2022. Master's Dissertation - Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB) Bauru.

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