INVESTIGATION OF YOU NG`S MODULUS AND THERMAL EXPANSION COEFFICIENT EFFECTS ON TRANSIENT THERMAL ANALYSI S OF COATED TOOTH

Authors : Hamid Zamanlou, Sadri SEN, Filiz Karabudak, Ruhi Yeşildal

Pages : 70-82

View : 27 | Download : 13

Publication Date : 2016-02-03

Article Type : Research Paper

Abstract :Objective: to investigate the ideal combination of materials for tooth prosthesis. Methods: Due to achieving fast results, the axisymmetrical finite element method insert ignore into journalissuearticles values(FEM); was used to compare stress distribution in a maxillary second premolar restored tooth by ANSYS program package. The five models insert ignore into journalissuearticles values(Model-1, Model-2, Model-3, Model-4, Model-5); were evaluated with different materials such as porcelain, Au-Pd, Ni-Cr, Ti, Zirconium. The tooth was assumed to be axisymmetric, non-directional features and elastic. Transient thermal stresses were studied in the models for different periods of time. Stress distribution of surfaces and interfaces were presented and they were evaluated with combine effect of Young’s modulus and thermal expansion coefficient. The combine effects and their constituents were explicated by considering stress distribution and its point of effect. Results: According to the results obtained by analyzing the numerical experiments; highest magnitude of stresses belongs to Model-4 which makes damage insert ignore into journalissuearticles values(separation and the formation of the interface crack); more likely to occur Model-5, Model-3, Model-1 and Model-2 follow Model-4 in a row.  Conclusion: Thermal expansion coefficient rate is the main reason of maximum stress distribution in first interface while rate of the elastic modulus causes the critical stress values in second interface with combination of Acrylic-NiCr-Cement-Dentin-Pulp-Alveoler bone in Model-4 and for this reason this model was chosen as the critical model. In comparison Model-4 with the other models, combination of Porcelain- Porcelain-Cement-Dentin-Pulp-Alveoler bone in Model-2  shows the better performance and recommended for clinical production modeling.
Keywords : Finite element method, dental coating, transient thermal stresses distribution