Thermal Analyses of Dental Ceramic Restorations

Authors: Barry Hojjatie W Bartholomew H Garmestani

Publish Date: 2013

Volume: , Issue: , Pages: 45-50

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Abstract

Previous studies have shown that development of compressive stresses on the surface of materials such as glass ceramic and steel will improve resistance to crack initiation and propagation in these materials The objective of this study was to develop computational models in MATALB and ANSYS to predict temperature and stress distributions in dental ceramic materials subjected to thermal tempering as a function of material properties and thermal tempering parameters In an initial study we obtained the cooling profiles corresponding to a transient heat transfer problem for bilayered ceramic disks and compared the results obtained from the MATLAB models with the FEA models developed in ANSYS In subsequent analyses we performed computational thermal stress analysis of the bilayered disks and various dental restorations using ANSYS Validity of the analytical thermal models was established by comparing the results from one dimensional model with those from the twodimensional models as well as by comparison of the corresponding results with those from the FEA models A good agreement between the analytical thermal models using MATLAB and computational models from ANSYS were obtained The results of this study show that relative geometric dimensions of the layered structures and the rate of cooling have a significant influence on the transient stress distribution within the restorations that may result in premature failure of these structures

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