Finite element analysis of the residual thermal stresses on functionally gradated dental restorations

• Autor(a) principal: Henriques, Bruno
• Data de Publicação: 2015
• Outros Autores: Miranda, G., Gasik, Michael, Souza, Júlio César Matias de, Nascimento, Rubens Maribondo do, Silva, Filipe Samuel
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/jspui/handle/123456789/27888
• topic: Dental restorations; Functionally gradated materials; Metal; Ceramic

The aim of this work was to study, using thefinite element method (FEM), the distributionof thermal residual stresses arising in metal–ceramic dental restorations after cooling fromthe processing temperature. Three different interface configurations were studied: withconventional sharp transition; one with a 50% metal–50% ceramic interlayer; and one witha compositionally functionally gradated material (FGM) interlayer. The FE analysis wasperformed based on experimental data obtained from Dynamic Mechanical Analysis (DMA)and Dilatometry (DIL) studies of the monolithic materials and metal/ceramic composites.Results have shown significant benefits of using the 50% metal–50% ceramic interlayerand the FGM interlayer over the conventional sharp transition interface configuration inreduction of the thermal residual stress and improvement of stress profiles. Maximumstresses magnitudes were reduced by 10% for the crowns with 50% metal–50% ceramicinterlayer and by 20% with FGM interlayer. The reduction in stress magnitude andsmoothness of the stress distribution profile due to the gradated architectures mightexplain the improved behavior of these novel dental restorative systems relative to theconventional one, demonstrated by in-vitro studies already reported in literature.