Tooth Discoloration Induced by Endodontic Phenothiazine Dyes in Photodynamic Therapy

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dc.contributor.authorFigueiredo, Romulo Aguiar
dc.contributor.authorAnami, Lilian Costa [UNESP]
dc.contributor.authorMello, Isabel
dc.contributor.authorCarvalho, Erica dos Santos
dc.contributor.authorHabitante, Sandra Marcia
dc.contributor.authorRaldi, Denise Pontes
dc.contributor.institutionUniv Taubate
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Manitoba
dc.date.accessioned2015-03-18T15:54:42Z
dc.date.available2015-03-18T15:54:42Z
dc.date.issued2014-08-01
dc.description.abstractObjective: This study sought to assess if discoloration of tooth structures occurs after photodynamic therapy (PDT) and to determine the efficacy of a protocol to remove the photosensitizers. Background data: PDT has been used in root canal treatment to enhance cleaning and disinfection of the root canal system. PDT uses a low power laser in association with a dye as a photosensitizer. Photosensitizers can induce staining of the dental structures, resulting in an unaesthetic appearance. Methods: Forty teeth were randomly divided into four groups according to the photosensitizer used and pre-irradiation time: 0.01% methylene blue for 5 min (MB5); 0.01% methylene blue for 10 min (MB 10); 0.01% toluidine blue for 5 min (TB5); and 0.01% toluidine blue for 10 min (TB 10). Specimens were irradiated with a 660 nm diode laser with a 300 mu m diameter optical fiber, at 40 mW power setting for 3 min. Immediately after, the photosensitizers were removed with Endo-PTC cream +2.5% sodium hypochlorite (NaOCl). The shade was measured by a Vita Easyshade spectrophotometer based on the CIELAB color system (L*a*b* values) at three different experimental times: before PDT (T0), immediately after PDT (T1), and after removal of the photosensitizer (T2). Results: The results showed a decrease in the averages of the L*a*b* coordinate values after PDT (T1) in all the groups, when compared with the number at T0, with a significant statistical difference in group MB10. After photosensitizer removal (T2), all the values of the coordinates increased with significant statistical differences (p < 0.05) between T1 and T2 in L* and a*. Conclusions: It can be concluded that both methylene blue and toluidine blue dyes cause tooth discoloration, and that Endo-PTC cream associated with 2.5% NaOCl effectively remove these dyes, regardless of the pre-irradiation time used for PDT.en
dc.description.affiliationUniv Taubate, Dept Dent, Sao Paulo, Brazil
dc.description.affiliationUNESP Sao Paulo State Univ, Inst Sci & Technol, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil
dc.description.affiliationUniv Manitoba, Div Endodontol, Dept Restorat Dent, Winnipeg, MB, Canada
dc.description.affiliationUnespUNESP Sao Paulo State Univ, Inst Sci & Technol, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil
dc.format.extent458-462
dc.identifierhttp://dx.doi.org/10.1089/pho.2014.3722
dc.identifier.citationPhotomedicine And Laser Surgery. New Rochelle: Mary Ann Liebert, Inc, v. 32, n. 8, p. 458-462, 2014.
dc.identifier.doi10.1089/pho.2014.3722
dc.identifier.issn1549-5418
dc.identifier.urihttp://hdl.handle.net/11449/116995
dc.identifier.wosWOS:000340526100006
dc.language.isoeng
dc.publisherMary Ann Liebert, Inc
dc.relation.ispartofPhotomedicine And Laser Surgery
dc.relation.ispartofjcr1.620
dc.relation.ispartofsjr0,443
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleTooth Discoloration Induced by Endodontic Phenothiazine Dyes in Photodynamic Therapyen
dc.typeArtigo
dcterms.rightsHolderMary Ann Liebert, Inc
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, São José dos Campospt

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