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Graduated glass infiltration in an ultra-translucent zirconia (5Y-PSZ): synthesis, processing and characterization of physical and mechanical properties

Grant number: 21/07440-2
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): August 01, 2022
Effective date (End): July 31, 2024
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Estevam Augusto Bonfante
Grantee:Larissa Marcia Martins Alves
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

Glass infiltration in polycrystalline ceramics has shown to improve optical, mechanical and adhesive properties. Although such advantages have already been proven for 1st and 2nd zirconia generations, these materials are susceptible to Low Temperature Degradation (LTD), which was the rationale behind the Young Investigator Award #2012/19078-7 that motivated the development of zirconia-alumina composites. Preliminary data reported to FAPESP and published by our team have demonstrated the successful development of ceramic composites resistant to LTD with unaltered optical and mechanical properties. However, the 3rd zirconia generation is resistant to LTD, since their microstructure mostly contains cubic phase and does not undergo phase transformation which, as a trade-off, eliminates the toughening mechanism and drastically decreases the mechanical performance. Thus, this project proposes to innovate by developing a compatible bioglass for the gradual infiltration of the 3rd generation zirconia, aiming to improve mechanical, optical and adhesive properties. 5Y-PSZ specimens will be infiltrated by the developed glass and after sintering will be characterized by Energy-Dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The density will be estimated, and the optical properties will be evaluated in a spectrophotometer. Hardness and fracture toughness will be calculated using Vickers indentation and gradual variation in the modulus of elasticity by nanoindentation. The biaxial flexural strength test will be performed to calculate the probability of survival (ISO 6872:2015), Weibull modulus and characteristic strength. (AU)

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