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The Effect of Power Bleaching Actived by Several Light Sources on Enamel Microhardness

dc.contributor.authorKabbach, W. [UNESP]
dc.contributor.authorZezell, D. M.
dc.contributor.authorBandeca, Matheus Coelho [UNESP]
dc.contributor.authorAndrade, M. F. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T13:47:01Z
dc.date.available2014-05-20T13:47:01Z
dc.date.issued2010-07-01
dc.description.abstractThe purpose of this study was to evaluate the influence of different light sources for in-office bleaching on surface microhardness of human enamel. One hundred and five blocks of third molars were distributed among seven groups. The facial enamel surface of each block was polished and baseline Knoop microhardness of enamel was assessed with a load of 25 g for 5 s. Subsequently, the enamel was treated with 35% hydrogen peroxide bleaching agent and photo-activated with halogen light (group A) during 38 s, LED (group B) during 360 s, and high intensity diode laser (group C) during 4 s. The groups D (38 s), E (360 s), and F (4 s) were treated with the bleaching agent without photo-activated. The control (group G) was only kept in saliva without any treatment. Microhardness was reassessed after 1 day of the bleaching treatment, and after 7 and 21 days storage in artificial saliva. The mean percentage and standard deviation of microhardness in Knoop Hardness Number were: A 97.8 +/- 13.1 KHN; B 95.5 +/- 12.7 KHN; C 84.2 +/- 13.6 KHN; D 128.6 +/- 20.5 KHN; E 133.9 +/- 14.2 KHN; F 123.9 +/- 14.2 KHN; G 129.8 +/- 18.8 KHN. Statistical analysis (p < 0.05; Tukey test) showed that microhardness percentage values were significantly lower in the groups irradiated with light when compared with the non-irradiated groups. Furthermore, the non-irradiated groups showed that saliva was able to enhance the microhardness during the measurement times. The enamel microhardness was decreased when light sources were used during the bleaching process and the artificial saliva was able to increase microhardness when no light was used.en
dc.description.affiliationUniv São Paulo State UNESP, Araraquara Sch Dent, Dept Restorat Dent, BR-14801903 Araraquara, SP, Brazil
dc.description.affiliationUniv São Paulo, Opt & Photon Res Ctr, São Paulo, Brazil
dc.description.affiliationUnespUniv São Paulo State UNESP, Araraquara Sch Dent, Dept Restorat Dent, BR-14801903 Araraquara, SP, Brazil
dc.format.extent1654-1658
dc.identifierhttp://dx.doi.org/10.1134/S1054660X10130074
dc.identifier.citationLaser Physics. New York: Maik Nauka/interperiodica/springer, v. 20, n. 7, p. 1654-1658, 2010.
dc.identifier.doi10.1134/S1054660X10130074
dc.identifier.issn1054-660X
dc.identifier.lattes2897622509429759
dc.identifier.urihttp://hdl.handle.net/11449/16686
dc.identifier.wosWOS:000280662100021
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.titleThe Effect of Power Bleaching Actived by Several Light Sources on Enamel Microhardnessen
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.lattes2897622509429759
unesp.author.orcid0000-0002-8099-8821[3]
unesp.author.orcid0000-0001-7404-9606[2]
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Odontologia, Araraquarapt
unesp.departmentOdontologia Restauradora - FOARpt

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