Publicação:
Effect of method used for sample preparation and light curing design on hardness and degree of conversion on bulk fill composite resin in molar teeth

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dc.contributor.advisor-co1Braga, Stella Sueli Lourenço
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/4174375194355994pt_BR
dc.contributor.advisor1Soares, Carlos José
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/3485765805045929pt_BR
dc.contributor.referee1Moura, Camilla Christian Gomes
dc.contributor.referee1Latteshttp://lattes.cnpq.br/8078512804636882pt_BR
dc.contributor.referee2Soares, Priscilla Barbosa Ferreira
dc.contributor.referee2Latteshttp://lattes.cnpq.br/5032809676969673pt_BR
dc.contributor.referee3Barcelos, Luciana Mendes
dc.contributor.referee3Latteshttp://lattes.cnpq.br/5425527112984849pt_BR
dc.creatorSchettini, Ana Cecília Teodoro
dc.creator.Latteshttp://lattes.cnpq.br/5745930443187628pt_BR
dc.date.accessioned2019-06-28T23:36:32Z
dc.date.available2019-06-28T23:36:32Z
dc.date.issued2019-06-22
dc.description.degreenameTrabalho de Conclusão de Curso (Graduação)pt_BR
dc.description.resumoOBJECTIVES: The aim of this study was to evaluate the effect of the sample preparation of bulk fill resin composites in molar influenced by the light curing units (LCUs) on Knoop hardness (KHN, N/mm2) and degree of conversion (DC, %) in different depths and regions. METHODS: Two molar teeth were selected. One molar was embedded in polystyrene resin, sectioned in three parts and received a MOD preparation with lateral cavities surfaces pre-polished and the other one was embedded and the MOD cavity was performed. Standardized expulsive cavity with 4 mm depth in the occlusal area and 5 mm at the proximal were made. Patient simulator with 44 mm of mouth opening had the molar teeth positioned as a second mandibular molar. Restorations were performed using a high viscosity bulk fill resin composite (Opus Bulk Fill, FGM) and light cured using two LCUs: VALO Cordless (Ultradent) and Bluephase G2 (Ivoclar-Vivadent). The resin composite was placed in one increment and light-cured for 40 s on distal and mesial occlusal surfaces. Samples were prepared: CEmPol, performed conventionally, embedded in polystyrene resin and polished before testing; CPol; performed conventionally, without embedment in polystyrene resin but polished before testing; PrePol, performed in a pre-polished molar cavity with no embedment or polishing before testing. KHN was calculated in different depths in two regions of mesial, occlusal and distal cavities. The degree of conversion was measured by Raman spectroscopy at the top and bottom of mesial, distal and at occlusal regions. Data of KHN and DC were analyzed by using 2-way repeated measurement followed by Tukey test (α = 0.05). RESULTS: Sample preparation method (P < 0.001), depth of restoration (P < 0.001) and the interaction between sample method and depth of restoration (P = 0.003) influence the KHN values. Significant influence was detected for sample confection method (P < 0.001), tooth region (P < 0.001), and for interaction between sample confection method and tooth region (P = 0.002) for DC values. In general, KHN reduced significantly from the top to the bottom of the restoration, mainly at proximal boxes. The PrePol method was the more efficient method to detect the significant difference for depth of the restoration and tooth region. Lower DC was found on the gingival region on the proximal box on the restoration, irrespective of the location being mesial, occlusal or distal area. CONCLUSION: The sample preparation that was embedded and polished had the uncompleted polymerized monomers layer removed due to the polishing process reducing the capacity of detection of KHN and DC values of bulk fill composite restorations influenced by depth or region of the cavities. The use of PrePol method was able to detect difference produced by light activation in deeper areas.pt_BR
dc.description.sponsorshipFAPEMIG - Fundação de Amparo a Pesquisa do Estado de Minas Geraispt_BR
dc.identifier.citationSCHETTINI, Ana Cecília Teodoro. Effect of method used for sample preparation and light curing design on hardness and degree of conversion on bulk fill composite resin in molar teeth. 2019. 25 f. Trabalho de Conclusão de Curso (Graduação em Odontologia) – Universidade Federal de Uberlândia, Uberlândia, 2019.pt_BR
dc.identifier.urihttps://repositorio.ufu.br/handle/123456789/25553
dc.languageengpt_BR
dc.orcid.putcode58961736
dc.publisherUniversidade Federal de Uberlândiapt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.courseOdontologiapt_BR
dc.rightsAcesso Abertopt_BR
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.sizeorduration25pt_BR
dc.subjectBulk fill compositept_BR
dc.subjectKnoop hardnesspt_BR
dc.subjectDegree of conversionpt_BR
dc.subjectLight curing designpt_BR
dc.subject.cnpqCNPQ::CIENCIAS DA SAUDEpt_BR
dc.titleEffect of method used for sample preparation and light curing design on hardness and degree of conversion on bulk fill composite resin in molar teethpt_BR
dc.title.alternativeEfeito do modo de preparo de amostras e do design de fontes fotopolimerizadoras em dureza knoop e grau de conversão em resinas bulk fill em dentes molarespt_BR
dc.typeTrabalho de Conclusão de Cursopt_BR
dspace.entity.typePublication

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