Análise numérica de interfaces de próteses dentárias através da mecânica do dano
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Data
2012-08-29
Autores
Lopes Júnior, José Aparecido [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Atualmente, na odontologia, após a perda de dentes por razões diversas, estes vêm sendo substituídos por implantes dentários. A importância e modelos computacionais biomecânicos é cada vez mais frequente, posto que essas ferramentas permitem simular o comportamento desses dispositivos que tentam restaurar as funções dos dentes perdidos. Como os aspectos biomecânicos de implantes são diferentes daqueles de um dente natural, circundando por um ligamento periodontal, a transferência da carga ao implante, e deste ao osso circundante, poide gerar esforços que, além de provocar falhas nas reabilitações, podem até ultrapassar o limite fisiológico e causar perda da osseointegração. Na análise desses sistemas de prótese, é essencial representar adequadamente as influências entre os diferentes componentes implante/coroa, que são comumente unidos através de parafusos. Falhas destas uniões podem prejudicar o correto funcionamento da prótese, ou até mesmo, produzir esforços não previstos, responsáveis por danos severos na prótese ou no osso. Assim, faz-se necessário descrever adequadamente o comportamento das interfaces entre os componentes dos sistemas protéticos. No presente trabalho, são utilizados elementos finitos sólidos tetraédricos com elevada razão de aspecto para representar a superfície de interface entre os componentes em contato implante/parafuso/coroa. Um modelo constitutivo de dano é empregado para reproduzir o comportamento desses elementos de interface. O modelo é desenvolvido para representar o comportamento diferenciado em tração e compressão na superfície de contato, permitir a separação dos componentes sem oferecer, praticamente, resistência, contudo, ao mesmo tempo, impedir movimentos de interpenetração no caso de solicitações compressivas no...
Currently, in dentistry, after loss of teeth for various reasons, they have been replaced by dental implants. The importance of biomechanical computer models is increasingly, since they tools allows for the simulation of the behavior of thes devices that try to restore the cunctions of missing teeth. As the biomechanical aspects of implants are different from those of natural tooth, surrounded by a periodontal ligament, the load transferred to the implant and the surrounding bone can generate stresses that, in addition to cause failures in rehabilitations, can even exceed the physiological limit and cause loss of osseointegration. In the analysis of these phosthetic systems, it is essential to adequately represent the interaction between different components that are commonly joined together by using screws. Possible joint failures can adversely affect the correct functioning of unions, or even produce stresses responsible for severe damage in prosthesis or bone. Thus, it is necessary to adequately describe the behavior of interfaces between components prosthetic systems. In this work, tetrahedral solid finite elements with high aspect ratio are used to represent the contact interface between components (implant/screw/Crown). A constitute damage model is employed to reproduce the behavior of these interface elements. The model is designed to represent the differentiated behavior in tension and compression on the contact surface, allowing the separation of the components without offering resistance, however, preventing movement of interpenetration in the case of compression on the contact. So it is expected that this... (Complete abstract click electronic access below)
Currently, in dentistry, after loss of teeth for various reasons, they have been replaced by dental implants. The importance of biomechanical computer models is increasingly, since they tools allows for the simulation of the behavior of thes devices that try to restore the cunctions of missing teeth. As the biomechanical aspects of implants are different from those of natural tooth, surrounded by a periodontal ligament, the load transferred to the implant and the surrounding bone can generate stresses that, in addition to cause failures in rehabilitations, can even exceed the physiological limit and cause loss of osseointegration. In the analysis of these phosthetic systems, it is essential to adequately represent the interaction between different components that are commonly joined together by using screws. Possible joint failures can adversely affect the correct functioning of unions, or even produce stresses responsible for severe damage in prosthesis or bone. Thus, it is necessary to adequately describe the behavior of interfaces between components prosthetic systems. In this work, tetrahedral solid finite elements with high aspect ratio are used to represent the contact interface between components (implant/screw/Crown). A constitute damage model is employed to reproduce the behavior of these interface elements. The model is designed to represent the differentiated behavior in tension and compression on the contact surface, allowing the separation of the components without offering resistance, however, preventing movement of interpenetration in the case of compression on the contact. So it is expected that this... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Biomecânica, Prótese dentária, Mecânica do dano contínuo, Biomechanics, Dentures, Continuum damage mechanics
Como citar
LOPES JÚNIOR, José Aparecido. Análise numérica de interfaces de próteses dentárias através da mecânica do dano. 2012. 78 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Engenharia, 2012.