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Measurement of shrinkage of composite resin by laser speckle contrast analysis

dc.contributor.authorJacomassi, D. P.
dc.contributor.authorLins, E. C.
dc.contributor.authorRastelli, Alessandra Nara de Souza [UNESP]
dc.contributor.authorKurachi, C.
dc.contributor.authorBagnato, V. S.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:47:06Z
dc.date.available2014-05-20T13:47:06Z
dc.date.issued2009-12-01
dc.description.abstractThe aim of this study was to evaluate the shrinkage of a microhybrid dental composite resin photo-activated by one LED with different power densities by means of speckle technique. The dental composite resin Filtek (TM) Z-250 (3M/ESPE) at color A(2) was used for the samples preparation. Uncured composite was packed in a metallic mold and irradiated during 20 s from 100 to 1000 mW cm(-2). For the photo-activation of the samples, it was used a LED prototype (Light Emission Diode) with wavelength centered at 470 nm and adjustable power density until 1 W cm(-2). The speckle patterns obtained from the bottom composite surfaces were monitored using a CCD camera without lens. The speckle field is recorded in a digital picture and stored by CCD camera as the carrier of information on the displacement of the tested surface. The calculated values were obtained for each pair of adjacent patterns and the changes in speckle contrast as a function of time were obtained from six repeated measurements. The speckle contrasts obtained from the bottom surface with 100 mW cm(-1) were smaller than those than the other power densities. The higher power densities provided the higher shrinkage.en
dc.description.affiliationUniv São Paulo, Phys Inst São Carlos, São Carlos, SP, Brazil
dc.description.affiliationUniv São Paulo State, UNESP, Araraquara Sch Dent, Dept Restorat Dent, Araraquara, SP, Brazil
dc.description.affiliationUnespUniv São Paulo State, UNESP, Araraquara Sch Dent, Dept Restorat Dent, Araraquara, SP, Brazil
dc.format.extent2230-2235
dc.identifierhttp://dx.doi.org/10.1134/S1054660X09230170
dc.identifier.citationLaser Physics. New York: Maik Nauka/interperiodica/springer, v. 19, n. 12, p. 2230-2235, 2009.
dc.identifier.doi10.1134/S1054660X09230170
dc.identifier.issn1054-660X
dc.identifier.lattes6914969526213393
dc.identifier.urihttp://hdl.handle.net/11449/16724
dc.identifier.wosWOS:000272532300017
dc.language.isoeng
dc.publisherMaik Nauka/interperiodica/springer
dc.relation.ispartofLaser Physics
dc.relation.ispartofjcr1.158
dc.rights.accessRightsAcesso restritopt
dc.sourceWeb of Science
dc.titleMeasurement of shrinkage of composite resin by laser speckle contrast analysisen
dc.typeArtigopt
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderMaik Nauka/interperiodica/springer
dspace.entity.typePublication
relation.isDepartmentOfPublication901124bf-5736-4432-b057-7c29dec84b50
relation.isDepartmentOfPublication.latestForDiscovery901124bf-5736-4432-b057-7c29dec84b50
relation.isOrgUnitOfPublicationca4c0298-cd82-48ee-a9c8-c97704bac2b0
relation.isOrgUnitOfPublication.latestForDiscoveryca4c0298-cd82-48ee-a9c8-c97704bac2b0
unesp.author.lattes6914969526213393[3]
unesp.author.orcid0000-0002-7967-6163[2]
unesp.author.orcid0000-0002-6768-2670[3]
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Odontologia, Araraquarapt
unesp.departmentOdontologia Restauradora - FOARpt

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