Avaliação da resistência á flexão e determinação das propriedades mecânicas de resinas compostas e sua aplicação no método dos elementos finitos
Data
2010-08-04
Autores
Piccioni, Maýra Andressa Rodrigues Valinhos [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
O Método de Elementos Finitos (MEF) constitui-se de uma ferramenta de amplo uso que permite, em computador, simular condições específicas em um material e determinar sua resposta para essas condições. O MEF pode ser utilizado em diversas áreas das ciências e, devido à sua grande aplicabilidade e eficiência, trabalhos com esta metodologia têm sido realizados nas diversas especialidades odontológicas, quando se deseja analisar comportamento mecânico. O objetivo deste trabalho foi determinar a resistência à flexão de resinas compostas “in vitro”, suas propriedades mecânicas e comprovar a aplicabilidade do Método dos Elementos Finitos nas mesmas. As resinas compostas selecionadas para esse trabalho foram: Nano-híbrida (Tetric NCeram - Ivoclar Vivadent), Nanoparticulada (Filtek Z350 – 3M Espe) e Microparticulada (Heliomolar – Ivoclar Vivadent). A primeira etapa do trabalho foi a execução do ensaio de resistêcia à flexão segundo a norma ISO no 4049:1988 no qual os corpos de prova foram confeccionados usando uma matriz metálica. O material restaurador foi inserido e acomodado na cavidade da matriz até o preenchimento com mínimo excesso. Após o preenchimento da matriz, a resina composta foi fotoativada. Após a fotopolimerização, o corpo de prova permaneceu em repouso, para em seguida, ser cuidadosamente separado da matriz e imerso em água destilada e em seguida polido. Posteriormente, foram armazenados em água destilada, à temperatura de 37oC, por 24 horas. Os espécimes foram retirados da água, secos, e suas dimensões verificadas e inseridas na fórmula para o cálculo da resistência à flexão. Então, o teste de resistência à flexão foi executado. A segunda etapa do trabalho consistiu em determinar as propriedades mecânicas: coeficiente de Poisson e módulo de Young (módulo de elasticidade) dessas resinas compostas segundo a norma...
The Finite Element Method (FEM) consists of a tool of ample use that allows, in computer, to simulate specific conditions in a material and to determine their behavior for these conditions. The FEM can be used in various fields of sciences and, because of its wide applicability and efficiency, works with this methodology have been conducted in various dental specialties, when we want to analyze mechanical behavior. The aim of this study was to determine the flexural strength of composite resins in vitro, their mechanical properties and prove the applicability of the Finite Element Method in them. The composite resins were selected for this work were: Nano-hybrid (Tetric N-Ceram - Ivoclar Vivadent), nanoparticulated (Filtek Z350 - 3M Espe) and microparticulated (Heliomolar - Ivoclar Vivadent). The first stage of this work was the flexural strenght test according to ISO 4049:1988 where the specimens were prepared using a metal matrix. The restorative material was inserted and accommodated in the cavity of the matrix filling it with minimal excess. After filling the matrix, the composite was light cured. After curing, the specimen remained at rest, to then be carefully separated from the matrix and immersed in distilled water and then polished. Were subsequently stored in distilled water at a temperature of 37oC for 24 hours. The specimens were removed from water, dried, and its dimensions recorded and entered into the formula for calculating the flexural strength. Then, the test was performed. The second stage of the study was to determine the mechanical properties: Poisson's Ratio and Young's Modulus (Modulus of Elasticity) of these composites according to ASTM D638 - 01, where the specimens were prepared using a matrix and the material cured subjected to the test in a tensile testing machine. The third stage of this work was to generate a CAD model with the mechanical properties:... (Complete abstract click electronic access below)
The Finite Element Method (FEM) consists of a tool of ample use that allows, in computer, to simulate specific conditions in a material and to determine their behavior for these conditions. The FEM can be used in various fields of sciences and, because of its wide applicability and efficiency, works with this methodology have been conducted in various dental specialties, when we want to analyze mechanical behavior. The aim of this study was to determine the flexural strength of composite resins in vitro, their mechanical properties and prove the applicability of the Finite Element Method in them. The composite resins were selected for this work were: Nano-hybrid (Tetric N-Ceram - Ivoclar Vivadent), nanoparticulated (Filtek Z350 - 3M Espe) and microparticulated (Heliomolar - Ivoclar Vivadent). The first stage of this work was the flexural strenght test according to ISO 4049:1988 where the specimens were prepared using a metal matrix. The restorative material was inserted and accommodated in the cavity of the matrix filling it with minimal excess. After filling the matrix, the composite was light cured. After curing, the specimen remained at rest, to then be carefully separated from the matrix and immersed in distilled water and then polished. Were subsequently stored in distilled water at a temperature of 37oC for 24 hours. The specimens were removed from water, dried, and its dimensions recorded and entered into the formula for calculating the flexural strength. Then, the test was performed. The second stage of the study was to determine the mechanical properties: Poisson's Ratio and Young's Modulus (Modulus of Elasticity) of these composites according to ASTM D638 - 01, where the specimens were prepared using a matrix and the material cured subjected to the test in a tensile testing machine. The third stage of this work was to generate a CAD model with the mechanical properties:... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Resinas compostas, Resitência á tração, Análise de elemento finito, Composite resins, Tensile strength, Finite element analysis
Como citar
PICCIONI, Maýra Andressa Rodrigues Valinhos. Avaliação da resistência á flexão e determinação das propriedades mecânicas de resinas compostas e sua aplicação no método dos elementos finitos. 2010. 99 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2010.