AN EVALUATION OF THE STRESS PATTERN DISTRIBUTION FOR ORTHODONTIC TOOTH MOVEMENTS - A FINITE ELEMENT STUDY

This study was conducted to evaluate stress pattern distribution in the periodontal ligament during various orthodontic tooth movements. Methods:A 3 dimensional FEM model of upper central incisor was developed from C.T scan images of the skull excluding the mandible. The principal stress obtained on the periodontal ligament due to various orthodontic loadings (tipping, bodily movement, intrusion, extrusion and rotations) were tested. Results: Intrusion, extrusion and rotation produced stresses concentrated at apex of root. Bodily movement and tipping forces produce stress concentrated at the alveolar crest and not at the root apex. Conclusion:Clinical implications of this study suggests that if the clinician is concerned about placing heavy stresses on the root apex then vertical and rotational forces must be applied with caution.