Effects of bleaching with carbamide peroxide gels on microhardness of restoration materials

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dc.contributor.authorCampos, Inger
dc.contributor.authorBriso, André Luiz Fraga [UNESP]
dc.contributor.authorPimenta, Luiz André Freire
dc.contributor.authorAmbrosano, Gláucia
dc.contributor.institutionUniv. Estácio de Sá
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2014-05-27T11:20:54Z
dc.date.available2014-05-27T11:20:54Z
dc.date.issued2003-09-04
dc.description.abstractThe objective of this in vitro study was to quantitatively assess the effects of bleaching with 10 and 15% carbamide peroxide (CP) on restoration materials by performing superficial microhardness analysis. Acrylic cylindrical containers (4 x 2 mm) were filled with the following restoration products: Charisma (Heraues Kulzer, Vila Santa Catarina, São Paulo, Brazil), Durafill VS (Heraeus Kulzer), Vitremer (3M, Sumaré, São Paulo, Brazil), Dyract (Dentsply, Petrópolis, Rio de Janeiro, Brazil), and Permite C (SDI, São Pauio, São Paulo, Brazil). Sixty samples were prepared of each restoration material. Twenty samples received bleaching treatment with 10% CP, 20 samples received bleaching treatment with 15% CP, and 20 samples were kept submerged in artificial saliva, which was replaced daily. The treatment consisted of immersion of the specimens in 1 cm3 of CP at 10 and 15% for 6 hours per day during 3 weeks, whereupon the test specimens were washed, dried, and kept immersed in artificial saliva for 18 hours. Then the test and control specimens were analyzed using a microhardness gauge. The Knoop Hardness Number (KHN) was taken for each test and control specimen at five different locations by applying a 25 g force for 20 seconds. The values obtained were transformed into KHNs and the mean was calculated. The data were submitted to statistical analysis by analysis of variance and Tukey test, p < .05. The means/standard deviations were as follows: Charisma: CP 10% 38.52/4.08, CP 15% 34.31/6.13, saliva 37.36/4.48; Durafill VS: CP 10% 18.65/1.65, CP 15% 19.38/2.23, saliva 18.27/1.43; Dyract AP: CP 10% 30.26/2.81, CP 15% 28.64/5.44, saliva 33.88/3.46; Vitremer: CP 10% 28.15/3.04, CP 15% 17.40/3.11, saliva 40.93/4.18; and Permite C: CP 10% 183.50/27.09, CP 15% 159.45/5.78, saliva 215.80/26.15. A decrease in microhardness was observed for the materials Dyract AP, Vitremer, and Permite C after treatment with CP at 10 and 15%, whereas no effect on either of the two composites (Charisma and Durafill) was verified. CLINICAL SIGNIFICANCE: The application of the carbamide peroxide gels at 10 and 15% did not alter the microhardness of the composite resins Charisma and Durafill. In situ and clinical studies are necessary to enable one to conclude that the reduction in microhardness of the materials effectively results in clinical harm to the restorations.en
dc.description.affiliationDepartment of Restorative Dentistry Univ. Estácio de Sá, Rio de Janeiro
dc.description.affiliationDepartment of Restorative Dentistry Sch. of Dent. of Aracatuba UNESP, Araçutuba
dc.description.affiliationDepartment of Restorative Dentistry Piracicaba Dental School State University of Campinas-Unicamp, Campinas
dc.description.affiliationDepartment of Biostatistics Stt. Univ. of Campinas - Unicamp, Campinas
dc.description.affiliation, Rua Machado de Assis, 49, Flamengo, Rio de Janeiro, 22220-060
dc.description.affiliationUnespDepartment of Restorative Dentistry Sch. of Dent. of Aracatuba UNESP, Araçutuba
dc.format.extent175-182
dc.identifierhttp://dx.doi.org/10.1111/j.1708-8240.2003.tb00187.x
dc.identifier.citationJournal of Esthetic and Restorative Dentistry, v. 15, n. 3, p. 175-182, 2003.
dc.identifier.doi10.1111/j.1708-8240.2003.tb00187.x
dc.identifier.issn1496-4155
dc.identifier.lattes5761956467234702
dc.identifier.scopus2-s2.0-0041379836
dc.identifier.urihttp://hdl.handle.net/11449/67411
dc.language.isoeng
dc.relation.ispartofJournal of Esthetic and Restorative Dentistry
dc.relation.ispartofjcr1.531
dc.relation.ispartofsjr0,753
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectperoxide
dc.subjectsaliva substitute
dc.subjectunclassified drug
dc.subjecturea peroxide
dc.subjectcontrolled study
dc.subjectdental care
dc.subjectdrug effect
dc.subjectgel
dc.subjecthardness
dc.subjecthuman
dc.subjecthuman tissue
dc.subjectAnalysis of Variance
dc.subjectCompomers
dc.subjectComposite Resins
dc.subjectDental Amalgam
dc.subjectDental Materials
dc.subjectDental Restoration, Permanent
dc.subjectDental Stress Analysis
dc.subjectDrug Combinations
dc.subjectGlass Ionomer Cements
dc.subjectHardness
dc.subjectMaterials Testing
dc.subjectOxidants
dc.subjectPeroxides
dc.subjectTime Factors
dc.subjectTooth Bleaching
dc.subjectUrea
dc.titleEffects of bleaching with carbamide peroxide gels on microhardness of restoration materialsen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
unesp.author.lattes5761956467234702[2]
unesp.author.orcid0000-0002-6126-1760[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araçatubapt

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Artigos - Odontologia Restauradora - FOA