Evaluation of degree of conversion and hardness of dental composites photoactivated with different light guide tips

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dc.contributor.authorGalvão, Marília Regalado [UNESP]
dc.contributor.authorCaldas, Sergei Godeiro Fernandes Rabelo [UNESP]
dc.contributor.authorBagnato, Vanderlei Salvador
dc.contributor.authorRastelli, Alessandra Nara de Souza [UNESP]
dc.contributor.authorAndrade, Marcelo Ferrarezi de [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-27T11:28:43Z
dc.date.available2014-05-27T11:28:43Z
dc.date.issued2013-03-26
dc.description.abstractObjective: The aim of this study was to evaluate the degree of conversion and hardness of different composite resins, photo-activated for 40 s with two different light guide tips, fiber optic and polymer. Methods: Five specimens were made for each group evaluated. The percentage of unreacted carbon double bonds (% C=C) was determined from the ratio of absorbance intensities of aliphatic C=C (peak at 1637 cm-1) against internal standard before and after curing of the specimen: aromatic C-C (peak at 1610 cm-1. The Vickers hardness measurements were performed in a universal testing machine. A 50 gf load was used and the indenter with a dwell time of 30 seconds. The degree of conversion and hardness mean values were analyzed separately by ANOVA and Tukey's test, with a significance level set at 5%. Results: The mean values of degree of conversion for the polymer and fiber optic light guide tip were statistically different (P<.001). The hardness mean values were statistically different among the light guide tips (P<.001), but also there was difference between top and bottom surfaces (P<.001). Conclusions: The results showed that the resins photo-activated with the fiber optic light guide tip promoted higher values for degree of conversion and hardness.en
dc.description.affiliationDepartment of Restorative Dentistry Araraquara School of Dentistry Univ. Estadual Paulista-UNESP, Araraquara, SP
dc.description.affiliationDepartment of Dentistry Rio Grande do Norte Federal University-UFRN, Natal, RN
dc.description.affiliationSão Carlos Physics Institute Optical Group, Biophotonics Lab University of São Paulo, São Carlos, SP
dc.description.affiliationUnespDepartment of Restorative Dentistry Araraquara School of Dentistry Univ. Estadual Paulista-UNESP, Araraquara, SP
dc.format.extent86-93
dc.identifierhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3571515/
dc.identifier.citationEuropean Journal of Dentistry, v. 7, n. 1, p. 86-93, 2013.
dc.identifier.file2-s2.0-84875257137.pdf
dc.identifier.issn1305-7456
dc.identifier.issn1305-7464
dc.identifier.lattes6914969526213393
dc.identifier.lattes2897622509429759
dc.identifier.scopus2-s2.0-84875257137
dc.identifier.urihttp://hdl.handle.net/11449/74878
dc.language.isoeng
dc.relation.ispartofEuropean Journal of Dentistry
dc.relation.ispartofsjr0,749
dc.relation.ispartofsjr0,749
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectComposite resins
dc.subjectHardness
dc.subjectPolymerization
dc.titleEvaluation of degree of conversion and hardness of dental composites photoactivated with different light guide tipsen
dc.typeArtigo
dcterms.licensehttp://www.eurjdent.com/aboutus.asp
unesp.author.lattes6914969526213393[4]
unesp.author.lattes2897622509429759
unesp.author.orcid0000-0002-6768-2670[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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Artigos - Odontologia Restauradora - FOAR