Influência da espessura da camada de cimento e da variação da temperatura no comportamento mecânico de fragmentos cerâmicos utilizados em restaurações estéticas
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Data
2012-02-16
Autores
Martini, Ana Paula [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Introdução: Fragmentos cerâmicos têm sido utilizados como opção restauradora em dentes anteriores com necessidade de pequenas correções de contorno e forma. A espessura da camada de cimento resinoso e a variação da temperatura intra-bucal são fatores influentes no sucesso das restaurações cerâmicas convencionais como inlays, onlays, coroas e laminados. Entretanto, a literatura não apresenta dados sobre a influência destes dois fatores no comportamento mecânico do fragmento cerâmico que geralmente apresenta dimensões não uniformes, principalmente nos limites da restauração. Proposição: O objetivo do presente estudo é analisar, através do método dos elementos finitos tridimensional (EF 3-D), o comportamento da camada de cimento resinoso e da cerâmica, variando a espessura da camada de cimento e a temperatura intra-bucal. Materiais e Métodos: Após a obtenção do conjunto de imagens microtomográficas de um incisivo central maxilar, o modelo sólido do dente será elaborado no programa Mimics. A partir deste modelo inicial (M), 5 modelos serão elaborados no programa SolidWorks, simulando a restauração do ângulo disto-incisal com o uso de um fragmento cerâmico colado ao substrato dental, variando a espessura da camada de cimento resinoso: M1 – 0 μm de espessura; M2 – 50 μm em toda...
Introduction: Ceramics fragments have been used for dental/aesthetic restorative purposes in the anterior dentition. The cement layer thickness and temperature variation play an important role for the adequate biomechanical behavior of the ceramics in case of inlays, onlays, total crown and laminate veneers. However, those aspects has not been evaluated in case of ceramics fragments that usually shows non-uniform dimension and shape which might have negative influence in the behavior of dental ceramics fragments. Purpose: The aim of this study was evaluated by 3-D finite element analysis the mechanical behavior of the cement layer and ceramic fragment varying the cement layer thickness and the temperature. Materials and Methods: After obtaining the microtomography data set of a maxillary central incisor, the solid model was rebuild using Mimics program. The model was exported to the Solidworks program for the simulation of a defect at the distal/incisal edge. This defect was restored with a ceramic fragment bonded to the enamel surface. From this restored model (M), 5 different models were tested: M1 – cement layer (CL) showing 0 μm of thickness; M2 – CL with an uniform thickness of 50 μm; M3 – CL with 50 μm at the margin of ceramics and 100 μm in the inner area; M4 – CL with 50 μm at the margin of ceramics and 200 μm in the inner area; and M5 – CL with 100 μm at the margin of ceramics and 200 μm in the inner area. In all models, the environment temperature changed from 5ºC to 50ºC in 4 increments. The finite element (FE) mesh was refined drove by convergence of analysis. The numerical approach was performed using Ansys Workbench FE program. Results: The maximum principal stress... (Complete abstract click electronic access below)
Introduction: Ceramics fragments have been used for dental/aesthetic restorative purposes in the anterior dentition. The cement layer thickness and temperature variation play an important role for the adequate biomechanical behavior of the ceramics in case of inlays, onlays, total crown and laminate veneers. However, those aspects has not been evaluated in case of ceramics fragments that usually shows non-uniform dimension and shape which might have negative influence in the behavior of dental ceramics fragments. Purpose: The aim of this study was evaluated by 3-D finite element analysis the mechanical behavior of the cement layer and ceramic fragment varying the cement layer thickness and the temperature. Materials and Methods: After obtaining the microtomography data set of a maxillary central incisor, the solid model was rebuild using Mimics program. The model was exported to the Solidworks program for the simulation of a defect at the distal/incisal edge. This defect was restored with a ceramic fragment bonded to the enamel surface. From this restored model (M), 5 different models were tested: M1 – cement layer (CL) showing 0 μm of thickness; M2 – CL with an uniform thickness of 50 μm; M3 – CL with 50 μm at the margin of ceramics and 100 μm in the inner area; M4 – CL with 50 μm at the margin of ceramics and 200 μm in the inner area; and M5 – CL with 100 μm at the margin of ceramics and 200 μm in the inner area. In all models, the environment temperature changed from 5ºC to 50ºC in 4 increments. The finite element (FE) mesh was refined drove by convergence of analysis. The numerical approach was performed using Ansys Workbench FE program. Results: The maximum principal stress... (Complete abstract click electronic access below)
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Palavras-chave
Método dos elementos finitos, Cimentos de resina, Cimentos dentarios, Ceramica
Como citar
MARTINI, Ana Paula. Influência da espessura da camada de cimento e da variação da temperatura no comportamento mecânico de fragmentos cerâmicos utilizados em restaurações estéticas. 2012. 66 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araçatuba, 2012.