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???metadata.dc.type???: Dissertação
Title: Influência de diferentes substratos na carga de fratura de um material restaurador híbrido
Other Titles: Influence of different substrates on the fracture loading of a hybrid restorative material
???metadata.dc.creator???: Facenda, Júlia Cadorim 
???metadata.dc.contributor.advisor1???: Corazza, Pedro Henrique
???metadata.dc.description.resumo???: O objetivo do estudo foi avaliar o efeito do substrato na carga de fratura de uma cerâmica infiltrada por polímero (PICN - Vita Enamic) após envelhecimento por ciclagem mecânica. Foram confeccionados 120 corpos de prova. Lâminas de PICN foram obtidas a partir de blocos de CAD/CAM e cimentadas aos substratos que possuíam forma de disco: dentina humana (EnDen); análogo da dentina (Nema Grade G10) (EnAnDen); liga metálica níquel-cromo (EnNiCr); e resina composta + pino de fibra de vidro (EnRC). Para comparar a resistência da cerâmica infiltrada por polímero a uma cerâmica feldspática e a uma resina laboratorial, 20 discos da cerâmica feldspática Vitablocs Mark II (FeAnDen) e 20 discos da resina laboratorial Opallis Lab (ResAnDen) foram cimentados ao análogo da dentina e sujeitos aos mesmos testes mecânicos dos demais grupos. Os corpos de prova tiveram sua dimensão final de aproximadamente 3,1 mm de espessura e 12 mm de diâmetro. Todos os corpos de prova foram submetidos à ciclagem mecânica (500.000 ciclos, 2 Hz, 50 N) e testados com uma de carga.
Abstract: The objective of the study was to evaluate the effect of the substrate on the fracture strength of a polymer-infiltrated ceramic network (PICN -Vita Enamic) after aging by mechanical cycling. 120 specimens were made. PICN slides were obtained from CAD / CAM blocks and cemented to disk shape substrates: dentin (EnDen); dentin analogue (EnAnDen); nickel-chromium alloy (EnNiCr); and composite resin + fiberglass post (EnRc). To compare the polymer-infiltrated ceramic to a feldspathic ceramic and an indirect resin, 20 disks of Vitablocs Mark II feldspathic ceramic (FeAnDen) and 20 disks of Opallis Lab resin (ResAnDen) were cemented to the dentin analog and subjected to the same tests than the other groups. The specimens had a final dimension of approximately 3.1 mm in thickness and 12 mm in diameter. All specimens were submitted to mechanical cycling (500,000 cycles, 2 Hz, 50 N) and tested with a compressive load in a universal testing machine (EMIC) at a speed of 0.5 mm / min. The fracture loading data were analyzed using 1-way ANOVA and Tukey test with a significance level of 95% (α = 0.05). A Weibull analysis was used to compare the groups with more than 10 specimens tested incompression. All specimens of the group FeAnDen fractured during the mechanical aging. 4 specimens of the group EnRc survived the mechanical aging, and their mean on the compression test was not statistically evaluated. In the comparison between EnDen, EnAnDen and EnNiCr, the mean of EnNiCr group was greater than the other two groups. There was no statistical difference between the means of the EnAnDen and EnDen groups. The Weibull (m) modulus of EnAnDen group (9.01) was statistically greater than EnDen group (3.15). The highest characteristic strength was obtained by EnNiCr group. Failure modes varied according to the momento of failure: failures during the cycling were mostly radial; failures during the compression test were mostly conical. The substrate influences on the compressive strength of a hybrid material after mechanical aging. The failure mode depends on the type of load applied. Polymer-content materials were more resistant to mechanical cycling compared to feldspathic ceramics.
Keywords: Cerâmica odontológica
Materiais dentários
Resinas dentárias
Odontologia
???metadata.dc.subject.cnpq???: CIENCIAS DA SAUDE::ODONTOLOGIA
???metadata.dc.language???: por
???metadata.dc.publisher.country???: Brasil
Publisher: Universidade de Passo Fundo
???metadata.dc.publisher.initials???: UPF
???metadata.dc.publisher.department???: Faculdade de Odontologia – FO
???metadata.dc.publisher.program???: Programa de Pós-Graduação em Odontologia
Citation: FACENDA, Júlia Cadorim. Influência de diferentes substratos na carga de fratura de um material restaurador híbrido. 2017. 149 f. Dissertação (Mestrado em Odontologia) - Universidade de Passo Fundo, Passo Fundo, RS, 2017.
???metadata.dc.rights???: Acesso Aberto
URI: http://tede.upf.br/jspui/handle/tede/1540
Issue Date: 31-Mar-2017
Appears in Collections:Programa de Pós-Graduação em Odontologia

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