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dc.contributor.authorOliveira de Vasconcellos, Luis Gustavo-
dc.contributor.authorBuso, Leonardo-
dc.contributor.authorLombardo, Geraldo H. L.-
dc.contributor.authorSouza, Rodrigo O. A.-
dc.contributor.authorNogueira Junior, Lafayette-
dc.contributor.authorBottino, Marco Antonio-
dc.contributor.authorOezcan, Mutlu-
dc.identifier.citationJournal of Prosthodontics-implant Esthetic and Reconstructive Dentistry. Malden: Wiley-blackwell, v. 19, n. 6, p. 471-477, 2010.-
dc.description.abstractPurpose: To evaluate the effect of the opaque layer firing temperature and mechanical and thermal cycling on the flexural strength of a ceramic fused to commercial cobalt-chromium alloy (Co-Cr). The hypotheses were that higher opaque layer temperatures increase the metal/ceramic bond strength and that aging reduces the bond strength.Materials and Methods: Metallic frameworks (25 x 3 x 0.5 mm(3); ISO 9693) (N = 60) were cast in Co-Cr and airborne-particle abraded (Al(2)O(3): 150 mu m) at the central area of the frameworks (8 x 3 mm(2)) and divided into three groups (N = 20), according to the opaque layer firing temperature: Gr1 (control)-900 degrees C; Gr2-950 degrees C; Gr3-1000 degrees C. The opaque ceramic (Opaque, Vita Zahnfabrick, Bad Sackingen, Germany) was applied, and the glass ceramic (Vita Omega 900, Vita Zahnfabrick) was fired onto it (thickness: 1 mm). While half the specimens from each group were randomly tested without aging (water storage: 37 degrees C/24 hours), the other half were mechanically loaded (20,000 cycles; 50 N load; distilled water at 37 degrees C) and thermocycled (3000 cycles; 5 degrees C to 55 degrees C, dwell time: 30 seconds). After the flexural strength test, failure types were noted. The data were analyzed using 2-way ANOVA and Tukey's test (alpha = 0.05).Results: Gr2 (19.41 +/- 5.5 N) and Gr3 (20.6 +/- 5 N) presented higher values than Gr1 (13.3 +/- 1.6 N) (p = 0.001). Mechanical and thermal cycling did not significantly influence the mean flexural strength values (p > 0.05). Increasing the opaque layer firing temperature improved the flexural bond strength values (p < 0.05). The hypotheses were partially accepted.Conclusion: Increasing of the opaque layer firing temperature improved the flexural bond strength between ceramic fused to Co-Cr alloy.en
dc.sourceWeb of Science-
dc.subjectMetal ceramic alloysen
dc.subjectchromium alloysen
dc.subjectflexural strengthen
dc.subjectmechanical cyclingen
dc.titleOpaque Layer Firing Temperature and Aging Effect on the Flexural Strength of Ceramic Fused to Cobalt-Chromium Alloyen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade Federal da Paraíba (UFPB)-
dc.contributor.institutionUniv Zurich-
dc.description.affiliationState Univ São Paulo, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, Brazil-
dc.description.affiliationFed Univ Paraiba UFPB, Dept Restorat Dent, Joao Pessoa, Paraiba, Brazil-
dc.description.affiliationUniv Zurich, Dent Mat Unit, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Ctr Dent & Oral Med, Zurich, Switzerland-
dc.description.affiliationUnespState Univ São Paulo, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Prosthodontics-implant Esthetic and Reconstructive Dentistry-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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