Development of the recycling process of 3Y-TZP and application in the production of composites with elastic module gradients

• Grant number: 22/12118-5
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Effective date (Start): January 01, 2023
• Status: Discontinued
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Estevam Augusto Bonfante
• Grantee: Henrico Badaoui Strazzi Sahyon
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
• Associated research grant: 21/06730-7 - Towards sustainable zirconia recycled from milling waste and boosted by glass infiltration for restorative use, and of the development of strong, graded, and aging resistant multilayered zirconia blocks, AP.JP2
• Associated scholarship(s): 23/13318-0 - Surface and mechanical properties of recycled zirconia boosted by glass infiltration submitted to different etching protocols and its influence on the bond strength to Ti-6Al-4V using luting agents containing antimicrobial multi-acrylamide monomers, BE.EP.PD

Abstract

The aim of Young Investigator Award phase 2 #2021/06730-7 is the synthesis of polycrystalline ceramics with aging resistance, mechanical strength and adhesiveness for monolithic use and the development of a method of recycling zirconia, subsequently improved by graded glass infiltration for use in multi-layer systems. This project is linked to Young Investigator Award phase 2, which will evaluate variables in the 3Y-TZP recycling routes, from blocks/disks discarded by commercial prosthetic laboratories (oddments), to establish a protocol for obtaining powder with the best properties for pressing. The factors to be investigated will be the size of the refined particles of the recycled powder (~50 um and d5 um), to be obtained in planetarium and mill and reversion from monoclinic to tetragonal phase, and the effect of glass infiltration (with and without glass incorporation) in the properties of recycled 3Y-TZP (powders of ~50 and d5 um). The properties of experimental materials in relation to microstructure (particle size distribution, theoretical density, scanning electron microscopy, X-ray diffraction and Raman spectroscopy), optical properties, mechanical properties (Vickers hardness, fracture toughness, biaxial flexural strength, fatigue) and fractography will be investigated. The data obtained will be subjected to exploratory analysis and application of appropriate statistical tests. In this project, we will present pilot data that corroborate the feasibility of the proposal. (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)

ALVES, LARISSA M. M.; CAMPOS, TIAGO M. B.; BERGAMO, EDMARA T. P.; BENALCAZAR JALKH, ERNESTO B.; GIERTHMUEHLEN, PETRA C.; SAILER, IRENA; THIM, GILMAR P.; STRAZZI-SAHYON, HENRICO B.; CELESTRINO, MARCOS; GUIMARAES, CAROLINA C. L.; et al. Hydrofluoric acid concentration and etching time affect differently the microstructure and surface properties of pressed lithium disilicate glass ceramics. Journal of Esthetic and Restorative Dentistry, v. N/A, p. 9-pg., 2023-09-29. (21/06730-7, 21/08018-2, 20/12874-9, 21/07440-2, 19/08693-1, 22/07157-1, 22/12118-5)