Finite element analysis on pushing the molar backwards using invisible aligner with different migration displacement

Abstract

Abstract This paper examines the biomechanical mechanism behind the effect of the invisible aligner technique on tooth movement processes. To compare the effects of different target positions on tooth movement and the periodontal ligament (PDL), two kinds of aligners were designed to provide displacements of 0.2 mm and 0.3 mm. Different displacements of the maxillary second molar were simulated using the finite element (FE) method. The results of numerical simulations showed that the maximum stress was in the PDL of the distal surface and the palatal surface. The aligner that provided a displacement of 0.2 mm was more suitable for pushing the second molar backwards in the initial stage. In addition, the displacement and rotation of teeth during orthodontic treatment were measured and analysed.