Influence of the number of bleaching sessions on fracture resistance and dentin microhardness of endodontically treated teeth

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dc.contributor.authorGarrido, Lorena D. M. A. [UNESP]
dc.contributor.authorKuga, Milton C. [UNESP]
dc.contributor.authorKalatzis-Sousa, Natália G. [UNESP]
dc.contributor.authorDantas, Andrea A. R. [UNESP]
dc.contributor.authorTonetto, Mateus R.
dc.contributor.authorLeonardo, Renato D. T. [UNESP]
dc.contributor.authorJordão-Basso, Keren C. F. [UNESP]
dc.contributor.authorLima, Suellen L.
dc.contributor.authorBorges, Alvaro H.
dc.contributor.authorBandeca, Matheus C.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Cuiabá
dc.contributor.institutionCEUMA University
dc.date.accessioned2018-12-11T17:09:02Z
dc.date.available2018-12-11T17:09:02Z
dc.date.issued2017-01-01
dc.description.abstractObjectives: To evaluate the effects of number of bleaching sessions on fracture resistance and dentin microhardness in endodontically treated teeth using 15% hydrogen peroxide with titanium dioxide nanoparticles (15HPTiO2) associated to light emitting diode (LED)–laser system. Materials and methods: Forty human incisors were endodontically treated and divided according to the number of bleaching sessions (n = 10, each group): G1 – no treatment G2 – one; G3 – two; and G4 – three sessions. The 15HPTiO2 was applied within the pulp chamber and on the buccal surface, then photoactivated using LED–laser. All experimental specimens were restored with ionomer glass cement between each session and in the final treatment. Specimens were then subjected to the fracture resistance test (kN), using an electromechanical machine. To the dentin microhardness evaluation, 40 crown extracted endodontically treated human teeth were longitudinally sectioned, divided into groups as previously described (n = 10), and submitted to similar bleaching protocol. Dentin microhardness was evaluated before and after the final dental bleaching session in each group using Knoop indentator. Data were analyzed by analysis of variance (ANOVA) and Tukey tests (p = 0.05). Results: The fracture resistance values were similar among all groups (p > 0.05). The number of dental bleaching sessions had a negative influence on the microhardness dentin, because G4 > G3 > G2 > G1 (p < 0.05). Conclusion: The number of bleaching sessions using 15% hydrogen peroxide with titanium dioxide nanoparticles associated to LED–laser system had no influence on the fracture resistance of the endodontically treated teeth crowns, but promoted a reduction in dentin microhardness.en
dc.description.affiliationDepartment of Restorative Dentistry Araraquara Dental School Universidade Estadual Paulista Júlio Mesquita Filho-UNESP
dc.description.affiliationDepartment of Postgraduate Program in Integrated Dental Science University of Cuiabá
dc.description.affiliationDepartment of Postgraduate Program in Dentistry CEUMA University
dc.description.affiliationUnespDepartment of Restorative Dentistry Araraquara Dental School Universidade Estadual Paulista Júlio Mesquita Filho-UNESP
dc.format.extent5-9
dc.identifierhttp://dx.doi.org/10.5005/jp-journals-10015-1402
dc.identifier.citationWorld Journal of Dentistry, v. 8, n. 1, p. 5-9, 2017.
dc.identifier.doi10.5005/jp-journals-10015-1402
dc.identifier.issn0976-6014
dc.identifier.issn0976-6006
dc.identifier.scopus2-s2.0-85009289219
dc.identifier.urihttp://hdl.handle.net/11449/174071
dc.language.isoeng
dc.relation.ispartofWorld Journal of Dentistry
dc.relation.ispartofsjr0,107
dc.relation.ispartofsjr0,107
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectDental bleaching
dc.subjectDentin
dc.subjectEndodontics
dc.subjectHydrogen peroxide
dc.subjectLasers
dc.titleInfluence of the number of bleaching sessions on fracture resistance and dentin microhardness of endodontically treated teethen
dc.typeArtigo
unesp.author.lattes7460825090327014[4]
unesp.author.orcid0000-0002-8309-8837[4]

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