Stress Distribution in Maxillary Anterior Region during En masse Intrusion of Six Anterior Teeth: A Finite Element Analysis

Abstract

Introduction: A true intrusion was considered difficult until recently but work of many clinicians has laid this controversy to rest. Effects of en masse intrusion have been studied only clinically till now. The aim of this study was to analyse stress distribution in alveolar bone, periodontal membrane, and the roots of six maxillary anterior teeth during their en masse intrusion by applying 45 grams of force per side by using finite element method. Methodology: In this study, a three-dimensional CT scan of six maxillary anterior teeth was taken. A finite element model of six maxillary anterior teeth was simulated. On this model, vertical intrusive force of 90 grams (45 gm/side) was applied to determine the stress distribution along the roots, periodontal ligament, and the surrounding bone of teeth. Results: We observed that the stress in our model was concentrated at apex of the roots. The maximum amount of stress was at apex of the central incisors followed by canines and then lateral incisors. In periodontal ligament (PDL) more amount of stress was seen at the apex of central incisors. Among teeth, PDL, and bone, the maximum amount of stress was observed in bone. Conclusion: It is concluded thatstresses on dentalsystems in our modelling study are in normative range. This stress can be taken up by the roots and the surrounding tissues without causingany deleterious effect.

Keywords

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