Efeito de tratamentos de superfície sobre a adesão de reparo com resina composta em restarações cerâmicas á base de zircônia Y-TPZ envelhecida hidrotermicamente
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Data
2013-03-14
Autores
Ribeiro, Beatriz Regalado Galvão [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O lascamento e a delaminação da porcelana de cobertura são considerados problemas técnicos frequentes em restaurações cerâmicas com infraestrutura em zircônia Y-TZP. O reparo intraoral com resina composta pode ser uma alternativa de tratamento para solucionar esse problema. Esse estudo avaliou o efeito de diferentes tratamentos de superfície e agentes de união sobre a união entre resina composta e zircônia Y-TZP envelhecida. Corpos-de-prova de zircônia Lava (n=14) foram confeccionados em forma de blocos (7,0 x 7,0 x 1,7 mm). Metade dos espécimes foi submetida ao envelhecimento hidrotérmico em autoclave a 134°C, 3 bar e 8 horas, enquanto a outra metade não sofreu envelhecimento (grupo controle). Difração de raios-X mostrou picos característicos das fases tetragonal e monoclínica, após a zircônia ser submetida ao tratamento em autoclave. As amostras foram subdivididas, de acordo com o tratamento de superfície: jateamento com partículas de alumina 50 μm, deposição triboquímica de sílica 30 μm (Rocatec Soft) ou sem tratamento abrasivo. Microscopia eletrônica de varredura, Espectroscopia por Dispersão de Energia (EDS) e Difração de raios-X foram utilizados para caracterização das amostras após os tratamentos. Clearfil Porcelain Bond Activator + Clearfil SE Bond; fina camada dos cimentos resinosos Panavia F ou RelyX U100 foram utilizados como agentes de união, antes da aplicação da resina composta Filtek Z350 XT, na forma de um cilindro (4,0 x 2,0 mm). Os nove subgrupos experimentais foram submetidos à ciclagem térmica (6.000 ciclos, 5 e 55°C, 30 segundos de imersão) antes do ensaio de resistência de união ao cisalhamento, em máquina de ensaios mecânicos EMIC DL2000 a uma velocidade de 0,5 mm/min. Os valores de resistência de união foram avaliados por meio da Análise de...
Chipping and adhesive failure of the veneer porcelain are considered frequent technical problems in zirconia YTZP-based ceramics restorations. The intraoral repair with composite resin become as an alternative treatment to solve this problem. This study evaluated the effect of different surface treatments, hydrothermal aging and bonding agent about the union Y-TZP zirconia/composite resin. 360 Lava zirconia specimens were made in the form of blocks (7.0 x 7.0 x 1.7 mm). Half of the specimens were subjected to hydrothermal aging by autoclaving at 134°C, 3 bar and 8 hs, while the other half were not subjected to aging (control group). X-ray diffraction analysis showed characteristic peaks of tetragonal and monoclinic phase, after the zirconia be subjected to autoclave treatment. The samples were subdivided according to the surface treatment: Sandblasting with 50 μm alumina particles, tribochemical silica coating 30 μm (Rocatec Soft) or without abrasive treatment. Scanning electron microscopy, Energy-dispersive spectroscopy (EDS) and x-ray diffraction were used for surface characterization. After the surface treatment 3 different bonding agents were applied: Clearfil Porcelain Bond Activator + Clearfil SE Bond; thin layer of luting cements Panavia F or RelyX U100. A cylinder (2.0 x 4.0 mm) of composite Filtek Z350 XT was built on the prepared zirconia to simulate the repairing. The nine experimental subgroups (n = 14) were thermal cycled (6,000 cycles, 5 and 55°C, 30-second dwell time) before the test of shear bond strength in mechanical testing machine EMIC DL2000 (0.5 mm/min). Bond strength values were evaluated using 2-way ANOVA and Tukey’s test (α = 5%). The fracture analyzed as adhesive failure, cohesive or mixed. All specimens without abrasive surface treatment debonded during thermal cycling. The results... (Complete abstract click electronic access below)
Chipping and adhesive failure of the veneer porcelain are considered frequent technical problems in zirconia YTZP-based ceramics restorations. The intraoral repair with composite resin become as an alternative treatment to solve this problem. This study evaluated the effect of different surface treatments, hydrothermal aging and bonding agent about the union Y-TZP zirconia/composite resin. 360 Lava zirconia specimens were made in the form of blocks (7.0 x 7.0 x 1.7 mm). Half of the specimens were subjected to hydrothermal aging by autoclaving at 134°C, 3 bar and 8 hs, while the other half were not subjected to aging (control group). X-ray diffraction analysis showed characteristic peaks of tetragonal and monoclinic phase, after the zirconia be subjected to autoclave treatment. The samples were subdivided according to the surface treatment: Sandblasting with 50 μm alumina particles, tribochemical silica coating 30 μm (Rocatec Soft) or without abrasive treatment. Scanning electron microscopy, Energy-dispersive spectroscopy (EDS) and x-ray diffraction were used for surface characterization. After the surface treatment 3 different bonding agents were applied: Clearfil Porcelain Bond Activator + Clearfil SE Bond; thin layer of luting cements Panavia F or RelyX U100. A cylinder (2.0 x 4.0 mm) of composite Filtek Z350 XT was built on the prepared zirconia to simulate the repairing. The nine experimental subgroups (n = 14) were thermal cycled (6,000 cycles, 5 and 55°C, 30-second dwell time) before the test of shear bond strength in mechanical testing machine EMIC DL2000 (0.5 mm/min). Bond strength values were evaluated using 2-way ANOVA and Tukey’s test (α = 5%). The fracture analyzed as adhesive failure, cohesive or mixed. All specimens without abrasive surface treatment debonded during thermal cycling. The results... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Resistência ao cisalhamento, Cimentos dentarios, Zircônia, Zirconia
Como citar
RIBEIRO, Beatriz Regalado Galvão. Efeito de tratamentos de superfície sobre a adesão de reparo com resina composta em restarações cerâmicas á base de zircônia Y-TPZ envelhecida hidrotermicamente. 2013. 113 f. Dissertação (mestrado) Universidade Estadual Paulista Julio de Mesquita Filho, Faculdade de Odontologia de Araraquara, 2013.