Stress analysis in dentistry

number: 
2017
English
Degree: 
Author: 
Amal Ibrahim Mahmood
Supervisor: 
Dr. Sadiq J. Abbas
Dr. Abass F. Hussain
year: 
2008

Abstract: Stress analysis using Finite Element Analysis for maxillary central incisor, mandibular central incisor and mandibular first molar human teeth were carried out in this work. AutoCAD (2007) program used to drawing two dimensional model of each tooth and then convert this two dimensional to three dimensional model. This Auto CAD structural model was imported to finite element software ANSYS (V. 10) program to get finite element model. 200N compression vertical loading was applied at two incisal points with different inclination. The first case was axial vertical loading, the second case was inclined with 26° to the vertical axis and third case was inclined with 45° to the vertical axis. The same loading was applied vertically but the load was distributed along the incisal area for the incisors and at occlusal margin for the molar. Finally the crown was considered as porcelain material and the vertical load was distributed along each tooth. The tooth under consideration was modeled as being composed of dentin and enamel. Materials were considered a homogeneous, isotropic, and linearly elastic. The effects of the periodontal ligament and cementum were omitted because of their very small thicknesses. The dental pulp was modeled as a void, because the pulp accept very little of the load. The model was assumed to be fixed at all the root region. The static loads applied in this work and the corresponding stresses may not reflect the only conditions encountered intraorally. Therefore the results were presented and considered qualitatively, not quantitavely. The increase in the loading angle from 0°, 26° to 45° resulted in an increase in tooth Von Mises stress which means increase the probability of tooth failure. When the load distributed along wide region the ability of model to fail for the same loading will be decreased. Also when the crown is considered as porcelain material there will be increasing in Von Mises stress comparing with the enamel crown.