Distribuição das tensões geradas ao redor de implantes osseointegrados de diferentes conexões cone morse: análise fotoelástica e pelo método dos elementos finitos
Carregando...
Arquivos
Data
2011-03-03
Autores
Anami, Lilian Costa [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi avaliar a localização e distribuição das tensões geradas ao redor de implantes com pilares protéticos de diferentes conexões cone Morse através da análise fotoelástica (AFE) e do método dos elementos finitos (MEF). Para o MEF, implante e pilares protéticos de diferentes conexões cone Morse (hexagonado e sólido) foram digitalizados pela técnica da microtomografia computadorizada e, com auxílio de softwares computacionais foi realizada a modelagem da malha tridimensional e o carregamento dos objetos. Foi realizada a caracterização das propriedades mecânicas da resina fotoelástica. Foram simulados blocos com propriedades mecânicas de osso cortical e trabecular e de resina fotoelástica. A AFE foi realizada a partir de blocos de resina fotoelástica onde foram incluídos os implantes aparafusados aos diferentes pilares protéticos. Estes blocos foram confeccionados a partir de um bloco prototipado do modelo utilizado no MEF. Os corpos-deprova foram imersos em um recipiente com óleo mineral e o conjunto foi observado no polariscópio circular com dispositivo de aplicação de cargas acoplado e recebendo a mesma carga, em sentido e posição iguais. Foi feita análise descritiva para as imagens obtidas em ambas as metodologias onde observou-se que: as imagens obtidas no MEF apresentaram distribuição de tensões bastante similar entre os dois modelos com diferentes pilares protéticos. Foram observadas diferenças entre a distribuição das tensões em blocos ósseo e de resina; As imagens obtidas na AFE se assemelharam às obtidas em MEF com bloco de resina. As imagens da AFE também foram analisadas quantitativamente, por comparação a valores atribuídos às franjas. A concordância interobservadores foi conferida pelo teste de Dahlberg. Concluiu-se que o Pilar Sólido transfere cargas mais homogeneamente para o osso adjacente ao implante...
The goal of this study was to evaluate the location and distribution of stresses generated around implants with different Morse taper connections abutments by photoelastic (PA) and finite element analysis (FEA). For FEA, implant and abutments with different Morse taper connections (hexagonal and solid) were scanned by computerized microtomography technique. The tridimensional mesh was modeled and the objects were loaded with the help of computer software. Photoelastic resin was characterized by mechanical properties. Trabecular and cortical bone and photoelastic resin blocks were simulated with their respective mechanical properties. The PA was performed with photoelastic resin blocks where implants were included and the different abutments were bolted. These blocks were made from a prototyped block of model used in FEA. Specimens were immersed in a mineral oil container and it was observed in the circular polariscope with the application device attached, where loads were received on same charge, on equal direction and position. Images obtained in both methodologies were descriptively analyzed where it was that: FEA images showed very similar stress distribution between two models with different abutments. Differences were observed between stress distribution in bone and resin blocks; PA images resembled those obtained on resin block FEA. PA images were also quantitatively analyzed by comparing the values assigned to fringes. Inter-observer agreement was given by Dahlberg test. It was concluded that solid abutment distributes loads more evenly to bone adjacent to implant compared with hexagonal abutment, for both analysis methods employed. Among the methodologies employed, it was observed that the PA has generated very similar results to those obtained in FEA with resin block, but different to those obtained in FEA when the clinical condition of the bone block was simulated
The goal of this study was to evaluate the location and distribution of stresses generated around implants with different Morse taper connections abutments by photoelastic (PA) and finite element analysis (FEA). For FEA, implant and abutments with different Morse taper connections (hexagonal and solid) were scanned by computerized microtomography technique. The tridimensional mesh was modeled and the objects were loaded with the help of computer software. Photoelastic resin was characterized by mechanical properties. Trabecular and cortical bone and photoelastic resin blocks were simulated with their respective mechanical properties. The PA was performed with photoelastic resin blocks where implants were included and the different abutments were bolted. These blocks were made from a prototyped block of model used in FEA. Specimens were immersed in a mineral oil container and it was observed in the circular polariscope with the application device attached, where loads were received on same charge, on equal direction and position. Images obtained in both methodologies were descriptively analyzed where it was that: FEA images showed very similar stress distribution between two models with different abutments. Differences were observed between stress distribution in bone and resin blocks; PA images resembled those obtained on resin block FEA. PA images were also quantitatively analyzed by comparing the values assigned to fringes. Inter-observer agreement was given by Dahlberg test. It was concluded that solid abutment distributes loads more evenly to bone adjacent to implant compared with hexagonal abutment, for both analysis methods employed. Among the methodologies employed, it was observed that the PA has generated very similar results to those obtained in FEA with resin block, but different to those obtained in FEA when the clinical condition of the bone block was simulated
Descrição
Palavras-chave
Prótese dentária, Birrefrigência, Análise por elemento finito, Birefringence, Finite Element Analysis
Como citar
ANAMI, Lilian Costa. Distribuição das tensões geradas ao redor de implantes osseointegrados de diferentes conexões cone morse: análise fotoelástica e pelo método dos elementos finitos. 2011. 111 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de São José dos Campos, 2011.