Opaque Layer Firing Temperature and Aging Effect on the Flexural Strength of Ceramic Fused to Cobalt-Chromium Alloy

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dc.contributor.authorOliveira de Vasconcellos, Luis Gustavo [UNESP]
dc.contributor.authorBuso, Leonardo [UNESP]
dc.contributor.authorLombardo, Geraldo H. L. [UNESP]
dc.contributor.authorSouza, Rodrigo O. A.
dc.contributor.authorNogueira Junior, Lafayette [UNESP]
dc.contributor.authorBottino, Marco Antonio [UNESP]
dc.contributor.authorOezcan, Mutlu
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal da Paraíba (UFPB)
dc.contributor.institutionUniv Zurich
dc.date.accessioned2014-05-20T14:05:06Z
dc.date.available2014-05-20T14:05:06Z
dc.date.issued2010-08-01
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.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.format.extent471-477
dc.identifierhttp://dx.doi.org/10.1111/j.1532-849X.2010.00600.x
dc.identifier.citationJournal of Prosthodontics-implant Esthetic and Reconstructive Dentistry. Malden: Wiley-blackwell, v. 19, n. 6, p. 471-477, 2010.
dc.identifier.doi10.1111/j.1532-849X.2010.00600.x
dc.identifier.issn1059-941X
dc.identifier.lattes7376974788169619
dc.identifier.lattes9234456003563666
dc.identifier.urihttp://hdl.handle.net/11449/22836
dc.identifier.wosWOS:000290119000009
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofJournal of Prosthodontics-implant Esthetic and Reconstructive Dentistry
dc.relation.ispartofjcr1.745
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMetal ceramic alloysen
dc.subjectchromium alloysen
dc.subjectflexural strengthen
dc.subjectmechanical cyclingen
dc.subjectthermocyclingen
dc.titleOpaque Layer Firing Temperature and Aging Effect on the Flexural Strength of Ceramic Fused to Cobalt-Chromium Alloyen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-blackwell
unesp.author.lattes7376974788169619
unesp.author.lattes9234456003563666
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, São José dos Campospt

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