3D finite element analysis of residual tensile stresses on bilayered dental ceramic systems.

Reference Presenter Authors
(Institution)
Abstract
10-070 Johnata Cavalcanti Fonseca Fonseca, J.C.(Universidade de São Paulo); Ferreira, E.B.(Universidade de São Paulo); Salomão, R.(Universidade de São Paulo); Paccola, R.(Universidade de São Paulo); Metal-free ceramics systems for dental prosthesis became very popular during the years among dentists and patients due to their functional and cosmetic attributes. However, they do not always have satisfactory performance. Manufacturers are constantly creating new products assuring that they have more durability and strength. The objective of this finite element analysis study was to calculate the residual tensile stresses of different bilayered systems made of common materials used in dentistry. We constructed a three-dimension finite element model of a second premolar from pictures of a magnetic resonance imaging (MRI) using the software Materialise Mimics. The model was subdivided into two layers (veneer and core) and exported to ANSYS. Properties taken from the literature were used to feed the viscoelastic model used for the veneers and test different combinations of materials. The systems were submitted to a temperature of 700 °C and cooled from free convection to room temperature. Then, the residual tensile stresses due to differential contraction rates between the layers were calculated for each case and compared with values from the literature. The procedures and results are then thoroughly discussed.
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