Morfologia da superficie e resistencia da união de ceramica IPS Empress Esthetic submetida a diferentes tratamentos

Autor:	Naves, Lucas Zago, 1981
Jazyk:	portugalština
Rok vydání:	2009
Předmět:	Cerâmica odontológica Resinas compostas Acido fluoridrico Dental porcelain Composite resins Hydrofluoric acid
Zdroj:	Repositório Institucional da UnicampUniversidade Estadual de CampinasUNICAMP.
Druh dokumentu:	masterThesis
Popis:	Orientadores: Lourenço Correr Sobrinho, Carlos Jose Soares Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-13T12:11:57Z (GMT). No. of bitstreams: 1 Naves_LucasZago_M.pdf: 3732245 bytes, checksum: f19061d71b96dbce2d54cda8b37f2ba9 (MD5) Previous issue date: 2009 Este estudo avaliou a morfologia de superfície e resistência de união ao microcisalhamento entre a cerâmica reforçada por leucita IPS Empress Esthetic (Ivoclar- Vivadent) e o cimento resinoso Variolink II (Ivoclar-Vivadent), em diferentes tempos de condicionamento da cerâmica, com e sem aplicação do adesivo após o uso do silano. Setenta e dois discos cerâmicos (6mm de diâmetro x 2mm de espessura) foram confeccionados, embutidos em resina e divididos em 12 grupos (n=6), definidos pelo tempo condicionamento com ácido fluorídrico 10% e aplicação ou não de adesivo após o uso do silano: G1 e G7 - 10s de condicionamento ácido, G2 e G8 - 20 s; G3 e G9 - 40 s; G4 e G10 - 60 s; G5 e G11 - 120 s e G6 e G12 - 60 + 60s. O silano foi aplicado em todos os grupos e metade dos grupos (de G7 a G12) receberam uma camada do adesivo (Scotchbond MP - 3M/ESPE). Molde de elastômero com dois orifícios cilíndricos (1,2mm de diâmetro x 2mm de altura) foi adaptado sobre a superfície da cerâmica para a construção de dois cilindros por amostra, totalizando 12 cilindros por grupo. Para tal, os orifícios foram preenchidos com o cimento resinoso (Variolink II), fotoativados por 40 s e submetidos ao ensaio de resistência de união ao microcisalhamento a velocidade de 0,5mm/min. e o padrão de fratura foi analisado. Os dados foram submetidos à Análise de Variância e ao teste de Student-Newman-Keul (p This study evaluated the influence of etching times on surface/interface morphology and micro-shear bond strength to Empress Esthetic leucite-reinforced glass ceramic (Ivoclar-Vivadent), with or without application of an unfilled resin after silane. Ceramic discs were divided into 12 groups (n = 6), defined by the etching time with 10% hydrofluoric acid: G1 and G7 - etching for 10s, G2 and G8 - 20 s; G3 and G9 - 40 s; G4 and G10 - 60 s; G5 and G11 - 120 s and G6 and G12 - 60 + 60s. Half of the groups (G7 to G12) received a layer of unfilled resin (Scotchbond MP/ 3M ESPE) after silane coupling. Micro-shear bonding test using Variolink II resin cement (Ivoclar-Vivadent) was performed, and data submitted to two-way ANOVA and Student-Newman-Keuls' test (p < 0.05). Evaluation of the etching pattern and bonding interfaces was conducted by Scanning Electron Microscopic (SEM). Means micro-shear bond strengths (MPa) were 19.4±3.5 (G1), 22.3±5.1 (G2), 22.2±3.2 (G3), 17.8±2.1 (G4), 15.3±3.0 (G5), 14.3±1.8 (G6) for groups treated with silane, and 17.4±4.8 (G7), 21.3±2.1 (G8), 21.1±2.3 (G9), 24.7±5.8 (G10), 20.4±2.2 (G11) e 18.5±4.6 (G12) for groups treated with silane and unfilled resin. Poor etching topography was detected on 10s etched surfaces, whereas fissures forming deep grooved channels were extensively observed in 120s and 60+60s ceramics surfaces. Unfilled spaces underlying the ceramic-resin cement interface were detected when only silane was applied. Fully completion of the irregularities on 60s and 120s samples were detected using the unfilled resin, although this material was unable to completely fill the irregularities on 60+60s (G12) ceramic. When only silane was applied, the 60s and the groups etched for longer periods (120 and 60+60s - G5 and G6) showed lower bond strengths, but when both silane and unfilled resin were applied, all etching times generally showed similar values. The etching protocol influenced the surface/interface topography and bond strength to ceramic. The application of unfilled resin was able to infiltrate all unfilled spaces beneath the ceramic-resin cement interface detected when only silane was applied, except on the re-etched (60+60s - G12) ceramic. Mestrado Materiais Dentarios Mestre em Materiais Dentários
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Externí odkaz:	http://repositorio.unicamp.br/jspui/handle/REPOSIP/289598 Zobrazit plný text záznamu