An Analysis of the Stress induced in the Periodontal Ligament during Extrusion and Rotation Movements— Part II: A Comparison of Linear vs Nonlinear FEM Study

Abstract

For rotational and extrusion movements, stress values over the periodontal ligament was within the range of optimal stress value as proposed by Lee, with a given force system by Proffit as optimum forces for orthodontic tooth movement using nonlinear properties. During rotation there are stresses concentrated at the apex, hence due to the concentration of the compressive forces at the apex a clinician must avoid placing heavy stresses during tooth movement.