Dentin microhardness during and after whitening treatments

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dc.contributor.authorFreitas, P. M. de
dc.contributor.authorTurssi, C. P.
dc.contributor.authorHara, A. T.
dc.contributor.authorSerra, M. C.
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-03-18T15:56:50Z
dc.date.available2015-03-18T15:56:50Z
dc.date.issued2004-05-01
dc.description.abstractObjective: This in vitro study aimed to evaluate the effect of bleaching agents on dentin microhardness during and after bleaching. Method and materials: Specimens were randomly assigned to seven groups (n = 15): Nite White Excel 2 Z [NW] 10% and 22%; Rembrandt [REM] 10% and 22%; Opalescence [OPA] 10% and 20%; and a placebo agent. The 42-day whitening treatment consisted of daily application of the agents to the dentin surfaces for 8 hours, followed by immersion in artificial saliva for 16 hours. After the bleaching treatment, specimens were kept immersed in artificial saliva for 14 days. Microhardness was measured at baseline, 8 hours, and 7, 14, 21, 28, 35, and 42 days of bleaching and during the posttreatment period (7 and 14 days). Results: The analysis of variance for split-plot showed a significant effect on the interaction between bleaching agent and time. Tukey's test and regression analyses revealed that during the bleaching period, the agents NW 10%, NW 22%, and OPA 20%, which did not differ from each other, did not alter dentin microhardness, showing constant microhardness values. There were no differences among REM 10%, REM 22%, and OPA 10%, which showed significant reductions in microhardness after day 14 compared to other agents. After bleaching procedures, there was an increase in dentin microhardness for all groups. Conclusion: Throughout the bleaching treatment, depending on the agent applied, dentin showed a transitory decrease in microhardness values. In the posttreatment period, artificial saliva presented a remineralizing effect on the bleached surfaces.en
dc.description.affiliationState Univ Campinas, Sch Dent Piracicaba, Dept Restorat Dent, Piracicaba, Brazil
dc.description.affiliationState Univ Sao Paulo, Sch Dent Ribeirao Preto, Dept Restorat Dent, Ribeirao Preto, Brazil
dc.description.affiliationUnespState Univ Sao Paulo, Sch Dent Ribeirao Preto, Dept Restorat Dent, Ribeirao Preto, Brazil
dc.format.extent411-417
dc.identifierhttp://www.quintpub.com/journals/qi/abstract.php?iss2_id=381&article_id=4767&article=15&title=Dentin#.VPX-_vnF_kU
dc.identifier.citationQuintessence International. Carol Stream: Quintessence Publ Co Inc, v. 35, n. 5, p. 411-417, 2004.
dc.identifier.issn0033-6572
dc.identifier.urihttp://hdl.handle.net/11449/117734
dc.identifier.wosWOS:000221595400016
dc.language.isoeng
dc.publisherQuintessence Publ Co Inc
dc.relation.ispartofQuintessence International
dc.relation.ispartofjcr1.088
dc.relation.ispartofsjr0,563
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectbleachingen
dc.subjectcarbamide peroxideen
dc.subjectdentinen
dc.subjectmicrohardnessen
dc.subjectsalivaen
dc.subjectvital teethen
dc.titleDentin microhardness during and after whitening treatmentsen
dc.typeArtigo
dcterms.rightsHolderQuintessence Publ Co Inc

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