Autor(es):
Villefort, Regina Furbino [UNESP] ; Amaral, Marina [UNESP] ; Rocha Pereira, Gabriel Kalil ; Bastos Campos, Tiago Moreira ; Zhang, Yu ; Bottino, Marco Antonio [UNESP] ; Valandro, Luiz Felipe [UNESP] ; Melo, Renata Marques de [UNESP]
Data: 2018
Identificador Persistente: http://hdl.handle.net/11449/162575
Origem: Oasisbr
Assunto(s): Zirconium; Fatigue; Silicon dioxide; Stress; Mechanical Fixed dental prostheses; Zirconium; Zirconium; Fatigue; Fatigue; Silicon dioxide; Silicon dioxide; Stress; Stress; Mechanical Fixed dental prostheses; Mechanical Fixed dental prostheses
Descrição
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
United States National Institute of Dental & Craniofacial Research, National Institutes of Health
Objective. This study evaluated the effects of two grading techniques of zirconia material on the fatigue limit of full-contour 3-unit fixed dental prostheses (FDPs). Methods. Presintered blocks of 3Y-TZP were milled to obtain sixty-nine 3-unit FDPs, which were divided into three groups (n = 23). The control group (CTL) was sintered and glazed following manufacturer's instructions. In the two experimental groups presintered FDPs received a surface silica/glass infiltration treatment before the sintering process. Silica sol-gel group (SSG) was graded by the sol-gel processing route, while the glass-zirconiaglass group (GZG) was graded by an enameling technique. Graded groups did not receive a glaze layer after sintering. All FDPs were then luted with a dual-curing resin cement on composite abutments, embedded in polyurethane and stored in water for five days. The initial load of the fatigue test was calculated based on the results of the monotonic testing applied on three specimens of each group. To determine the fatigue limit, 20 samples of each group were subjected to staircase testing (100,000 cycles/5 Hz). Results. The fatigue limits (in Newtons) were CTL= 1607.27, SSG = 1824.31, and GZG= 2006.57, and the Dixon and Mood test indicated statistically significant differences among groups (95% confidence interval) (GZG > SSG > CTL). Significance. The infiltration of silica and glass on bulk zirconia, by two different grading methods, increased the fatigue limits of monolithic zirconia FDPs. (C) 2016 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Sao Paulo State Univ, Sch Dent, Restorat Dent, Prosthet Dent Unit, Av Eng Franscisco Jose Longo,777, BR-12245 Sao Jose Dos Campos, SP, Brazil
Univ Fed Santa Maria, Oral Sci, Prosthet Dent Unit, R Floriano Peixoto,1184, BR-97015 Santa Maria, RS, Brazil
Technol Inst Aeronaut, Dept Phys, Sao Jose Dos Campos, SP, Brazil
New York Univ Coll Dent, Dept Biomat & Biomimet, New York, NY 10010 USA
Univ Fed Santa Maria, Fac Odontol, MDS PhD Grad Program Oral Sci, Prosthodont Unit, R Floriano Peixoto,1184, BR-97015 Santa Maria, RS, Brazil
Sao Paulo State Univ, Sch Dent, Restorat Dent, Prosthet Dent Unit, Av Eng Franscisco Jose Longo,777, BR-12245 Sao Jose Dos Campos, SP, Brazil
United States National Institute of Dental & Craniofacial Research, National Institutes of Health: 2R01 DE017925
