Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/353112
Type: Artigo
Title: Fracture strength of aged monolithic and bilayer zirconia-based crowns
Author: Lameira, Deborah Pacheco
Buarque e Silva, Wilkens Aurelio
Andrade e Silva, Frederico
De Souza, Grace M.
Abstract: The purpose of this study was to evaluate the effect of design and surface finishing on fracture strength of yttria-tetragonal zirconia polycrystal (Y-TZP) crowns in monolithic (1.5 mm thickness) and bilayer (0.8 mm zirconia coping and 0.7 mm porcelain veneer) configuration after artificial aging. Bovine incisors received crown preparation and Y-TZP crowns were manufactured using CAD/CAM technique, according to the following groups (n = 10): Polished monolithic zirconia crowns (PM); Glazed monolithic zirconia crowns (GM); Bi-layer crowns (BL). Crowns were cemented with resin cement, submitted to artificial aging in a chewing simulator (2.5 million cycles/80 N/artificial saliva/37 degrees C), and tested for fracture strength. Two remaining crowns referring to PM and GM groups were submitted to a chemical composition analysis to measure the level of yttrium after aging. One-way ANOVA and Tukey's test (P = .05) indicated that monolithic zirconia crowns presented similar fracture strength (PM = 3476.2 N +/- 791.7; GM = 3561.5 N +/- 991.6), which was higher than bilayer crowns (2060.4 N +/- 810.6). There was no difference in the yttrium content among the three surfaces evaluated in the monolithic crowns. Thus, monolithic zirconia crowns present higher fracture strength than bilayer veneered zirconia after artificial aging and surface finishing does not affect their fracture strength
Subject: Degradação
Resistência à flexão
Cerâmica odontológica
Country: Reino Unido
Editor: Hindawi
Rights: Aberto
Identifier DOI: 10.1155/2015/418641
Address: https://www.hindawi.com/journals/bmri/2015/418641/
Date Issue: 2015
Appears in Collections:FOP - Artigos e Outros Documentos

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