title: Finite element analysis of the residual thermal stresses on functionally gradated dental restorations.
abstract: The aim of this work was to study, using the finite element method (FEM), the distribution of thermal residual stresses arising in metal-ceramic dental restorations after cooling from the processing temperature. Three different interface configurations were studied: with conventional sharp transition; one with a 50% metal-50% ceramic interlayer; and one with a compositionally functionally gradated material (FGM) interlayer. The FE analysis was performed 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 interlayer and the FGM interlayer over the conventional sharp transition interface configuration in reduction of the thermal residual stress and improvement of stress profiles. Maximum stresses magnitudes were reduced by 10% for the crowns with 50% metal-50% ceramic interlayer and by 20% with FGM interlayer. The reduction in stress magnitude and smoothness of the stress distribution profile due to the gradated architectures might explain the improved behavior of these novel dental restorative systems relative to the conventional one, demonstrated by in-vitro studies already reported in literature.
authors.affiliation: CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; Federal University of Santa Catarina, Campus Blumenau, 89065-300 Blumenau, SC, Brazil. Electronic address: brunohenriques@dem.uminho.pt.
authors.forename: B
authors.initials: B
authors.lastname: Henriques
authors.affiliation: CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
authors.forename: G
authors.initials: G
authors.lastname: Miranda
authors.affiliation: Department of Materials Science and Engineering, School of Chemical Technology, Aalto University Foundation, 00076 Aalto, Espoo, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Gasik
authors.affiliation: CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; School of Dentistry (DODT), Post-Graduation Program in Dentistry (PPGO), Federal University of Santa Catarina, Campus Trindade, 88040-900 Florianópolis, SC, Brazil.
authors.forename: J C M
authors.initials: JC
authors.lastname: Souza
authors.affiliation: Departament of Materials Engineering, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, ;Brazil.
authors.forename: R M
authors.initials: RM
authors.lastname: Nascimento
authors.affiliation: CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
authors.forename: F S
authors.initials: FS
authors.lastname: Silva
mesh_terms: D055119:Elastic Modulus; D020342:Finite Element Analysis; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D013314:Stress, Mechanical; D013696:Temperature
chemical_list: D016876:Metal Ceramic Alloys
keywords: Ceramic; Dental restorations; Functionally gradated materials; Metal