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Effect of silica infiltrations by the sol-gel method on a dental zirconia: microstructure, mechanical properties and interfacial fracture energy

Grant number: 15/16387-7
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2016
Effective date (End): August 08, 2018
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Renata Marques de Melo Marinho
Grantee:Nathália de Carvalho Ramos Ribeiro
Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil
Associated scholarship(s):16/20001-0 - Effect of Silica Infiltrations of Dental Zirconia in Interfacial Energy to Fracture, BE.EP.DR


The objective of the study is to evaluate the effects of silica dipping infiltration by sol-gel method performed in the presence of catalysts in mechanical properties, microstructure and surface characteristics of a Y-TZP Zirconia as well as the interfacial energy (toughness Fracture) in bond to resin cement. Disks are made of Y-TZP and Zirconia divided into 5 groups, infiltrated by silicic acid obtained by TEOS - with and without catalyst, infiltrated by silicic acid obtained sodium metasilicate (Na2SiO3) - with and without catalyst and uninfiltrated (control). The discs will be characterized with XRD, DRXR, Raman, hardness, SEM and EDS, and then will be submitted to biaxial bending test. They will be analyzed with descriptive and inferential statistics as well as the Weibull analysis to determine the structural homogeneity. After mechanical characterization, Brazil nut specimens will be made to realize toughness fracture of bond. The infiltrated samples will be conditioned with hydrofluoric acid and analyzed by SEM and optical perfilometer until the pattern of conditioning is set. The samples will be tested with a compression test with samples placed at different angles (0-25), so we can get the pure tensile fracture, pure shear or in both modes. This way is calculated the interfacial energy to the adhesive interface fracture. The discs and the Brazil nut specimens will be observed in stereomicroscope and SEM to determine fracture characteristics (path taken by the trips). (AU)

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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)
RAMOS, N. C.; KAIZER, M. R.; CAMPOS, T. M. B.; KIM, J.; ZHANG, Y.; MELO, R. M.. Silica-Based Infiltrations for Enhanced Zirconia-Resin Interface Toughness. JOURNAL OF DENTAL RESEARCH, v. 98, n. 4, p. 423-429, . (16/07920-6, 16/20001-0, 15/16387-7)
RAMOS, N. C.; ALVES, L. M. M.; RICCO, P.; SANTOS, G. M. A. S.; BOTTINO, M. A.; CAMPOS, T. M. B.; MELO, R. M.. Strength and bondability of a dental Y-TZP after silica sol-gel infiltrations. CERAMICS INTERNATIONAL, v. 46, n. 10, B, p. 17018-17024, . (15/16387-7, 16/07920-6, 16/20001-0)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
RIBEIRO, Nathália de Carvalho Ramos. Effect of silica infiltrations by the sol-gel method on a dental zirconia: microstructure, mechanical properties and interfacial fracture energy. 2018. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Instituto de Ciência e Tecnologia. São José dos Campos São José dos Campos.

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