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Glass transition and degree of conversion of a light-cured orthodontic composite

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dc.contributor.authorSostena, Michela M. D. S. [UNESP]
dc.contributor.authorNogueira, Renata A. [UNESP]
dc.contributor.authorGrandini, Carlos Roberto [UNESP]
dc.contributor.authorMoraes, João Carlos Silos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:29:45Z
dc.date.available2014-05-20T13:29:45Z
dc.date.issued2009-11-01
dc.description.abstractObjective: This study evaluated the glass transition temperature (T(g)) and degree of conversion (DC) of a light-cured (Fill Magic) versus a chemically cured (Concise) orthodontic composite. Material and Methods: Anelastic relaxation spectroscopy was used for the first time to determine the T(g) of a dental composite, while the DC was evaluated by infrared spectroscopy. The light-cured composite specimens were irradiated with a commercial LED light-curing unit using different exposure times (40, 90 and 120 s). Results: Fill Magic presented lower T(g) than Concise (35-84 degrees C versus 135 degrees C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower T(g) than Concise due to its higher organic phase content, and that when this light-cured composite is used to bond orthodontic brackets, a minimum energy density of 7.8 J/cm(2) is necessary to reach adequate conversion level and obtain satisfactory adhesion.en
dc.description.affiliationSão Paulo State Univ, Dept Chem & Phys, Ilha Solteira, SP, Brazil
dc.description.affiliationSão Paulo State Univ, Dept Phys, Bauru, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Dept Chem & Phys, Ilha Solteira, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Dept Phys, Bauru, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent570-573
dc.identifierhttp://dx.doi.org/10.1590/S1678-77572009000600006
dc.identifier.citationJournal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 17, n. 6, p. 570-573, 2009.
dc.identifier.fileS1678-77572009000600006-en.pdf
dc.identifier.issn1678-7757
dc.identifier.orcid0000-0002-3336-309X
dc.identifier.scieloS1678-77572009000600006
dc.identifier.urihttp://hdl.handle.net/11449/10066
dc.identifier.wosWOS:000272950100006
dc.language.isoeng
dc.publisherUniversidade de São Paulo (USP), Faculdade de Odontologia de Bauru
dc.relation.ispartofJournal of Applied Oral Science
dc.relation.ispartofjcr1.709
dc.relation.ispartofsjr0,645
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectOrthodontic compositeen
dc.subjectGlass transition temperatureen
dc.subjectDegree of conversionen
dc.subjectMechanical spectroscopyen
dc.subjectInfra-red spectroscopyen
dc.titleGlass transition and degree of conversion of a light-cured orthodontic compositeen
dc.typeArtigo
dcterms.licensehttp://www.scielo.br/revistas/jaos/paboutj.htm
dcterms.rightsHolderUniv São Paulo Fac Odontologia Bauru
dspace.entity.typePublication
unesp.author.lattes2949983867418338[3]
unesp.author.orcid0000-0002-3336-309X[3]
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Engenharia, Ilha Solteirapt
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Ciências, Baurupt
unesp.departmentFísica - FCpt
unesp.departmentFísica e Química - FEISpt

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Coleções

Ilha Solteira - FEIS - Faculdade de Engenharia
Bauru - FC - Faculdade de Ciências