Development and characterization of conventional ZTA composite mechanical properties for monolithic CAD / CAM prostheses

• Grant number: 16/24165-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: January 01, 2017
• End date: December 31, 2017
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Estevam Augusto Bonfante
• Grantee: Fábio Bortolin
• 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

Abstract

Tetragonal zirconia stabilized by yttrium (Y-TZP) is a promising material. However, it presents hydrothermal instability at low temperatures due to the transformation from the metastable tetragonal phase to the monoclinic phase. The transformation may lead to low temperature degradation (LTD) which may compromise the mechanical properties of the material and the long-term reliability of rehabilitations. The aim of this project is to innovate on the synthesis of polycrystalline composites with 85% of alumina reinforced by 15% of conventional zirconia (ZTA - zirconia toughened alumina). The project is designed for the dentistry field which highlights the best characteristics of alumina as well as of zirconia, while offering materials with improved mechanical resistance when compared to alumina, and resistance to LTD. A ZTA composite with conventional zirconia powder will be produced. The biaxial flexural resistance, the fractography and the probability of survival will be characterized. The results will be analysed according to the innovation main project (available at SAGE as: Anexo_31_Projeto Inovacao.pdf) (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)

BENALCAZAR JALKH, E. B.; BERGAMO, E. T. P.; MONTEIRO, K. N.; CESAR, P. F.; GENOVA, L. A.; LOPES, A. C. O.; LISBOA FILHO, P. N.; COELHO, P. G.; SANTOS, C. F.; BORTOLIN, F.; et al. Aging resistance of an experimental zirconia-toughened alumina composite for large span dental prostheses: Optical and mechanical characterization. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 104, APR 2020. (19/08693-1, 19/00452-5, 16/24165-7, 17/19362-0, 18/03072-6, 16/18657-4, 19/14798-0, 12/19078-7, 16/18818-8, 16/17793-1)