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New treatment of internal surface of infrastructure: influence on fracture resistance of Y-TZP crowns

Grant number: 12/05657-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): February 01, 2013
Effective date (End): January 31, 2016
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Marco Antonio Bottino
Grantee:Fernanda Campos
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil


The objective of this study is to evaluate the effect of different treatments of the internal surface of the infrastructure and mechanical cycling on the fracture resistance of Y-TZP crowns. 100 pillars will be machined in epoxy resin which will receive crowns with infrastructure in Y-TZP coated with veneering ceramic. The samples will be allocate in 10 groups according to the factors "treatment of inner surface" (4 levels - no treatment, application of overglaze, sandblasting with alumina particles of 110 µm and sandblasting with alumina coated with silica particles of 30 µm) and "mechanical cycling" (two levels - with and without mechanical cycling), besides there will be utilized the factor "cement" (2 levels - resin cement and zinc phosphate cement) only for those groups with no treatment of the inner surface. There will be performed 3.0 x 106 cycles of cycling mechanical with load of 50 N and frequency of 4 Hz. The compression test of the crown will be conduct in a universal testing machine (EMIC) at a speed of 1 mm/min in an aqueous environment (37 ° C). The fractured crowns will be examined under a stereomicroscope and scanning electron microscope to verify the failure mode. The results will be statistically analyzed by analysis of variance (ANOVA) and Tukey test (± = 5%). The data obtained will be discussed in front of the pertinent literature. (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)
CAMPOS, F.; VALANDRO, L. F.; FEITOSA, S. A.; KLEVERLAAN, C. J.; FEILZER, A. J.; DE JAGER, N.; BOTTINO, M. A. Adhesive Cementation Promotes Higher Fatigue Resistance to Zirconia Crowns. Operative Dentistry, v. 42, n. 2, p. 215-224, MAR-APR 2017. Web of Science Citations: 17.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
CAMPOS, Fernanda. Resistência à fadiga de infraestruturas de zircônia: influência da estratégia de cimentação. 2016. Doctoral Thesis - Universidade Estadual Paulista "Julio de Mesquita Filho" Instituto de Ciência e Tecnologia..

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