A Multi-Directional Analysis of the Center of Resistance using Finite Element Model of the Human Mandibular Canine

Abstract

Abstract Background The most important factor determining the quality of orthodontic tooth movement is the relationship between the force and the tooth center of resistance. Tooth supporting structures features affect the center of resistance location and these features varies in different areas around the specific tooth. So the aim of this study is the multi-planar analysis of the center of resistance using finite element models of the human mandibular canine to find the exact location of the center of resistance when viewed from different aspects. Method The left mandibular canine, periodontal ligament, cortical bone and spongy bone designed in Soidwork (version 2021) according to a contralateral canine with a complete eruption in a case with an impacted canine which has been ordered for CBCT. the tooth dimension was slightly modified according to wheelers dental anatomy. The meshed model was created. A 1N.mm couple was applied to the model and the center of resistance was evaluated from different 24 planes with 15 degrees intervals. Results The location of human mandibular center of resistance is different in horizontal plane when evaluated in different directions. It is in the range of 46–86% of canine root length from the apex and moves up to 4.48 millimeters occlusogingivally. In the buccal or lingual directions CRes location was found more apical than its mesial or distal counterparts. Conclusions the location of the CRes changes when evaluated in different directions related to supporting tissue features. It can therefore be concluded that canine requires a higher M/F for buccolingual translation than for a mesiodistal translation