Experimental composits 80%ZrO2 -20%Al2O3: microstructural, optical and survivor characterization

• Grant number: 18/19094-9
• Support type: Scholarships in Brazil - Master
• Effective date (Start): January 01, 2019
• Effective date (End): April 30, 2020
• Field of knowledge: Health Sciences - Dentistry
• Principal Investigator: Estevam Augusto Bonfante
• Grantee: Lucas Fracassi de Oliveira Lino
• 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

Abstract

Yttria-stabilized tetragonal zircônia (Y_TZP) presents hydrotermal instability in low temperatures by the transformation of the tetragonal fase into monoclinic fase, leading to low temperature degradation (LTD) and possible impairment of mechanical properties. Inside the aid Jovem Pesquisador 2012/19078-7, in which this project inserts, some compositions of zirconia toughened alumina (ZTA) are being synthesized and characterized with the aim to circumvent the limitations of Y-TZP. This project proposes the synthesis and characterization of a composition of alumina toughened zirconia (ATZ) of 80% ZrO2 -20% Al2O3, in other words, with a different approach comparing with what we have done in another orientations linked to this aid JP (FAPESP #2016/24165-7, 2016/18657-4, 2016/17793-1, 2017/19362-0). Will be prepared 40 proof bodies in disc format with final dimension of 12 mm of diameter and 1mm of thickness by uniaxial and isostatic pressing. After sintered and polished, optic properties will be evaluated (n=10) by white (Yw) and black (Yb) background reflectance in spectrophotometer to obtain values of the contrast ratio and translucency parameter. Will be performed biaxial flexural strength test (ISO 6872:2015) (n=30/grupo) and fractographic analysis for the calculation of the probability of survival, Weibull module and characteristic strength. The cristaline fases will be observed by X-ray diffraction test (XRD) (n=3). (AU)

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.; CARDOSO, KARINA B.; LINO, LUCAS F. O.; CAMPOS, TIAGO M. B.; MONTEIRO, KELLI N.; CESAR, PAULO F.; GENOVA, LUIS A.; THIM, GILMAR P.; COELHO, PAULO G.; BONFANTE, ESTEVAM A. Alumina-toughened zirconia for dental applications: Physicochemical, mechanical, optical, and residual stress characterization after artificial aging. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS, DEC 2020. Web of Science Citations: 0.

KARINA BERGAMO CARDOSO; EDMARA TATIELY PEDROSO BERGAMO; VITOR DE MORAES CRUZ; ILANA SANTOS RAMALHO; LUCAS FRACASSI DE OLIVEIRA LINO; ESTEVAM AUGUSTO BONFANTE. Three-dimensional misfit between Ti-Base abutments and implants evaluated by replica technique. Journal of Applied Oral Science, v. 28, p. -, 2020. Web of Science Citations: 0.