Year : 2022

Volume : Volume 13

Issue : Issue 6

Address for correspondence :
Dr. Sapna Badani,
sapnabadani654@gmail.com

Abstract

Background: Space closure by en masse intrusion and retraction in orthodontics is of particular interest. Aims and Objectives: The aim of this study is to evaluate the amount of intrusion on the anterior teeth as well as the posterior teeth during en masse retraction of maxillary anterior teeth with clear aligners and conventional method using mini-implants after the extractions of maxillary first premolars using three-dimensional finite element analysis. Materials and Methods: Two different finite element models of maxillary arch with extracted premolars were constructed to understand the amount of intrusion patterns of anterior teeth during en masse intrusion and retraction on conventional model and aligner model. Results: Anterior intrusion was seen more in clear aligner model and posterior intrusion was seen more in conventional model. In anterior intrusion, lateral incisor was involved compared to other anterior teeth in both conventional and aligner model. While during posterior intrusion maxillary second molars are involved and intrusion changes are seen increasing from mesial to distal end. Conclusion: Intrusion is a common orthodontic tooth movement which is employed in the cases of deep bite where anteriors are intruded for correction or in anterior open bite where posteriors are intruded to close the bite for correction. The article discusses the biomechanics of intrusion in orthodontic treatment using digital planning and depending least on the patients for the results.

Keywords: Anterior intrusion, Posterior intrusion, Finite element analysis, Clear aligners.