Three-dimensional Finite Element Analysis Of Molar And Premolar At Various Degrees Of Attrition

Toothwear of aging people is an important study in clinical therapy in stomatology. While many investigate and study has been done on its clinic, there have had few stress analyses of teeth and root under these conditions. Combining spiral CT(SCT) scanning technology, digital image transfer and transcription, with three-dimensional finite element method (3-D FEM), a satisfactory 3-D FE models of the mandibular premolar and molar with biomechanical property is constructed , a research on the features of stress distribution in the normal and wearing teeth under different conditions is conducted from the biomechanical point view.Our study can be divided into three parts: 1.Development of the three-dimensional finite elementmodelThe purpose of this partwasto construct 3-D FE models of the mandibular premolar and molar by means of SCT scanning technology, digital image transfer and transcription, 3-D FEM in order to provide the model basis for the biomechanical study in the molar and premolar. The result show: The constructed model has good morphology. It can be rotated arbitrarily, which was observed in any interesting direction and manner through removing a part of image freely. Furthermore, we can select any section or section in the model to observe freely, and can cut out or add in some needed elements in accordance with the purpose of study. 2. Three-dimensional finite element analysis of molar at various degrees of attritionThe purpose of this partwasto investigate the stress distribution of normal mandibular molar and severe attrition under various loadings. Three models with severe attrition were simulated by varying the tooth height, The results were as follows: The stress concentration exhibited at the cervical regions and root apex in the normal model. Severe attritionshifted the location of highest stress away from the cervical region to the root.3. Three-dimensional finite element analysis of premolar at various degrees of attritionThe purpose of this study was to determine the locations of stress concentrations in mandibular premolar and severe attrition. The resulting stress were monitored and recorded. Severe attrition shifted the location of highest stress away from the cervical region to the root. Therefore, cervical stress concentration is less likely to occur on severe attrition compared to stable teeth.