Effect of different light sources on degree of conversion, hardness and plasticization of a composite

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dc.contributor.authorBarreto, Bruno de Castro Ferreira
dc.contributor.authorCatelan, Anderson
dc.contributor.authorOkida, Ricardo Coelho [UNESP]
dc.contributor.authorGonçalves, Gisele Fernanda [UNESP]
dc.contributor.authorSilva, Gisele Rodrigues
dc.contributor.authorSantos, Paulo Henrique [UNESP]
dc.contributor.authorXavier, Tathy Aparecida
dc.contributor.authorAguiar, Flávio Henrique Baggio
dc.contributor.authorSoares, Carlos José
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Uberlândia (UFU)
dc.contributor.institutionUniversidade de Campinas
dc.date.accessioned2016-01-28T16:55:29Z
dc.date.available2016-01-28T16:55:29Z
dc.date.issued2013
dc.description.abstractClinical performance of composite resins depends largely on their mechanical properties,and those are influenced by several factors,such as the light-curing mode. The purpose of this study was to evaluate the influence of different light sources on degree of conversion(DC), Knoop hardness(KHN) and plasticization(P) of a composite resin. Disc-shaped specimens (5 x 2 mm) of Esthet-X(Dentsply) methacrylate-based microhybrid composite were light-cured using quartz-tungsten-halogen (QTH) Optilight Plus(Gnatus) or light-emitting diode(LED) Ultraled(Dabi Atlante) curing units at 400 and 340 mW/cm2 of irradiance, respectively. After 24 h, absorption spectra of composite were obtained using Nexus 670(Nicolet)FT-IR spectrometer in order to calculate the DC.The KHN was measured in the HMV-2000(Shimadzu) microhardness tester under 50 g loads for 15 s, and P was evaluated by percentage reductio of hardness after 24 h of alcohol storage. Data were subjected to t-Student test(alpha=0.05).QTH device showed lower P and higher KHN$ than LED (p<0.05), and no difference between the light-curing units was found for DC (p>0.05). The halogen-curing unit with higher irradiance promoted higher KHN and lower softening in alcohol than LED.en
dc.description.affiliationDepartment of Operative Dentistry and Dental Materials, Dental School, University of Uberlandia, Uberlandia, MG, Brazil
dc.description.affiliationDepartment of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
dc.description.affiliationDepartment of Restorative Dentistry, Araçatuba School of Dentistry, State University of São Paulo (UNESP), Araçatuba, SP, Brazil
dc.description.affiliationDepartment of Dental Materials and Prostodontics, Araçatuba School of Dentistry, State University of São Paulo (UNESP), Araçatuba, SP, Brasil
dc.description.affiliationUnespDepartment of Restorative Dentistry, Araçatuba School of Dentistry, State University of São Paulo (UNESP), Araçatuba, SP, Brazil
dc.description.affiliationUnespDepartment of Dental Materials and Prostodontics, Araçatuba School of Dentistry, State University of São Paulo (UNESP), Araçatuba, SP, Brasil
dc.format.extent135-139
dc.identifierhttp://www.portaldeperiodicos.unisul.br/index.php/JR_Dentistry/article/view/1511
dc.identifier.citationjournal of research in dentistry tubarão, v. 1, n. 2, p. 135-139, 2013.
dc.identifier.issn2317-5907
dc.identifier.lattes4629404319391359
dc.identifier.lattes2201243962159442
dc.identifier.lattes4301268775018864
dc.identifier.urihttp://hdl.handle.net/11449/133527
dc.language.isoeng
dc.relation.ispartofjournal of research in dentistry tubarão
dc.rights.accessRightsAcesso restrito
dc.sourceCurrículo Lattes
dc.titleEffect of different light sources on degree of conversion, hardness and plasticization of a compositeen
dc.typeArtigo
unesp.author.lattes4629404319391359
unesp.author.lattes2201243962159442
unesp.author.lattes4301268775018864
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araçatubapt
unesp.departmentOdontologia Restauradorapt

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Artigos - Odontologia Restauradora - FOA
Artigos - Materiais Odontológicos e Prótese - FOA