Calcium analysis from gamma sterilized human dentin and enamel

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dc.contributor.authorZAMATARO, CLAUDIA B.pt_BR
dc.contributor.authorKUCHAR, NIELSEN G.pt_BR
dc.contributor.authorSCAPIN, MARCOS A.pt_BR
dc.contributor.authorZANINI, NATHALIApt_BR
dc.contributor.authorCASTRO, PEDROpt_BR
dc.contributor.authorRABELO, THAIS F.pt_BR
dc.contributor.authorJUVINO, AMANDA C.pt_BR
dc.contributor.authorZEZELL, DENISEpt_BR
dc.coverageNacionalpt_BR
dc.creator.eventoENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 42.pt_BR
dc.date.accessioned2019-10-09T18:00:31Z
dc.date.available2019-10-09T18:00:31Z
dc.date.evento26-31 de maio, 2019pt_BR
dc.description.abstractGamma radiation changes the patients0 oral cavity undergoing radiotherapy. Alterations cause an unsaturated environment of calcium and phosphate into the oral cavity. After approval of the Ethics Committee, 20 hu- man teeth were sectioned to obtain 20 human enamel and 20 dentin samples, polished plane. Samples were randomized in the irradiated group and control group (untreated). Then, the treatment group was irradiated with 25:0 kGy at the 60Co multipurpose irradiator. After the gamma irradiation, Fourier Transformed Infrared Spectroscopy (FTIR), percentage of surface microhardness loss (%SMHL) and Scanning Electron Microscopy (SEM) were performed. At the end, acidic biopsies were performed to quantify the concentration of calcium present in the samples. FTIR showed that the molecular structure of HA of the enamel is similar to the non- irradiated, with no formation or loss of molecular compounds occurring. X-ray °uorescence at enamel samples was performed. Microscopic morphological analysis did not shown signi¯cant di®erences. Surface microhardness is an indirect indicator of the mineral content of the samples. The mean obtained was 258:2 (38:8) KHN within the hardness spectrum of the healthy natural enamel. The compounds present in the samples and the values of the ratios of Calcium and Phosphate oxides and relation between the elements Calcium and Phosphorus. The ratio of the most stable oxides shows a variation with linear correlation. In the enamel, the ratio (Ca/P) shows a change in the elemental content with linear correlation (R2 = 1). These ¯ndings lead us to a new hypothesis of behaviour of the HA crystal versus gamma irradiation. On the other hand for the irradiated dentin, the Knoop hardness number was within the range of the spectrum similar to that of natural dentin of human origin. X-ray °uorescence shows that irradiated dentin has great similarity with natural dentin from the point of view of chemical composition. SEM analyses showed that there was no thermal damage or interprismatic morpho- logical changes in the hydroxyapatite structure of human dental dentin outside the buccal environment when using doses of gamma irradiation up to 25 kGy.pt_BR
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)pt_BR
dc.description.sponsorshipIDCNPq: INCT 465763/2014-6; PQ 309902/2017-7pt_BR
dc.description.sponsorshipIDCAPES: PROCAD 88881.068505/2014-01pt_BR
dc.event.siglaEOSBFpt_BR
dc.identifier.citationZAMATARO, CLAUDIA B.; KUCHAR, NIELSEN G.; SCAPIN, MARCOS A.; ZANINI, NATHALIA; CASTRO, PEDRO; RABELO, THAIS F.; JUVINO, AMANDA C.; ZEZELL, DENISE. Calcium analysis from gamma sterilized human dentin and enamel. In: ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 42., 26-31 de maio, 2019, Aracaju, SE. <b>Resumo...</b> São Paulo: Sociedade Brasileira de Física, 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/30214.
dc.identifier.orcid0000-0001-7404-9606pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7404-9606
dc.identifier.orcidhttps://orcid.org/0000-0002-0606-4369
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/30214
dc.localSão Paulopt_BR
dc.local.eventoAracaju, SEpt_BR
dc.publisherSociedade Brasileira de Físicapt_BR
dc.rightsopenAccesspt_BR
dc.titleCalcium analysis from gamma sterilized human dentin and enamelpt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorNIELSEN GROSKO KUCHAR
ipen.autorNATHALIA ZANINI ALVES STEPHANO
ipen.autorTHAIS FREITAS RABELO
ipen.autorDENISE MARIA ZEZELL
ipen.autorAMANDA CARAMEL JUVINO
ipen.autorPEDRO ARTHUR AUGUSTO DE CASTRO
ipen.autorMARCOS ANTONIO SCAPIN
ipen.autorCLAUDIA BIANCHI ZAMATARO
ipen.codigoautor14973
ipen.codigoautor14972
ipen.codigoautor15018
ipen.codigoautor693
ipen.codigoautor15033
ipen.codigoautor12053
ipen.codigoautor836
ipen.codigoautor7966
ipen.contributor.ipenauthorNIELSEN GROSKO KUCHAR
ipen.contributor.ipenauthorNATHALIA ZANINI ALVES STEPHANO
ipen.contributor.ipenauthorTHAIS FREITAS RABELO
ipen.contributor.ipenauthorDENISE MARIA ZEZELL
ipen.contributor.ipenauthorAMANDA CARAMEL JUVINO
ipen.contributor.ipenauthorPEDRO ARTHUR AUGUSTO DE CASTRO
ipen.contributor.ipenauthorMARCOS ANTONIO SCAPIN
ipen.contributor.ipenauthorCLAUDIA BIANCHI ZAMATARO
ipen.date.recebimento19-10
ipen.event.datapadronizada2019pt_BR
ipen.identifier.ipendoc26005pt_BR
ipen.notas.internasResumopt_BR
ipen.type.genreResumo
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sigepi.autor.atividadeZEZELL, DENISE:693:920:Npt_BR
sigepi.autor.atividadeJUVINO, AMANDA C.:15033:-1:Npt_BR
sigepi.autor.atividadeRABELO, THAIS F.:15018:-1:Npt_BR
sigepi.autor.atividadeCASTRO, PEDRO:12053:920:Npt_BR
sigepi.autor.atividadeZANINI, NATHALIA:14972:-1:Npt_BR
sigepi.autor.atividadeSCAPIN, MARCOS A.:836:510:Npt_BR
sigepi.autor.atividadeKUCHAR, NIELSEN G.:14973:-1:Npt_BR
sigepi.autor.atividadeZAMATARO, CLAUDIA B.:7966:920:Spt_BR
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