2d And 3d Modelling Comparison For A HumanFirst Premolar To Determine An AppropriateCavity Filling Material

Abstract

A finite element Technique is used to examine the stress distribution in a human first premolar with and without cavity preparetion by using 2dimensional and 3-dimensional models. The effects of different materials as cavity fillers on stress distribution are investigated. The effects of spring support conditions and temperature are also considered in the study. The finite element method, an often used engineering technique, is well suited for application to the dental stress analysis. 2D and 3D stress distribution have been investigated for a specific cavity design and for an inclined load conditions. Cavity preparation to first premolar causes high principal stress concentration as expected. Opening a cavity 1 mm above cole causes higher maximum principal stresses with respect to the tooth without cavity for both 2D and 3D models. The results obtained from these two different models are almost same. Gold and porcelain are placed both on aqua cem and ketac cem but, these materials providing better interfaces in clinical applications do not show important differences in mechanical point of view. Gold as cavity filling material shows good mechanical characteristics. It reduces the stress concentration due to the cavity opening. Porcelain shows better mechanical compatibility than gold. Stresses obtained by using porcelain are lower and the distribution of stresses are more homogenous. A higher temperature (50°C) results in a very slight increase in the stresses in the nodes around the cavity due to the increase in stresses created by restrained joints. Therefore temperature increase up to 50°C does not show any considerable increase. By using spring support condition displacements in longitudinal and horizontal directions are slightly increased. Springs with the coefficients given provide the elastic media given by the soft tissue under tooth.