Year : 2024

Volume : Volume 15

Issue : Issue 4

Address for correspondence :
Dr. Somil Gupta
ssgupta2307@gmail.com

Abstract

Objective: This study is aimed to evaluate the changes in torque during en masse retraction of maxillary anterior teeth segment in, completely leveled and incompletely leveled arches. A maxillary arch form and continuous tooth movement was stimulated by finite element analysis. Materials and Methods: It is an in vitro observational study. Three 3D finite element method models were constructed with different tip values in posterior segment. (1) 2nd Premolar tip 0° and 1st and 2nd Molar tip 5° (completely leveled arch), (2) 2nd PM tip 2° and 1st and 2nd M tip 7°, and (3) 2nd PM tip 4° and 1st and 2nd M tip 9° (2 and 3 were incompletely leveled arches). Extraction of first premolar was hypothesized. Torque change was calculated by measuring the displacement of the anterior teeth during en masse retraction at crown tip and root apex in two different planes, that is, sagittal and vertical using Y and Z axis, respectively, in all three models. Results: When the extraction space of first premolar was closed, the anterior teeth were extruded and bite deepened. Torque loss was evident in all the three models. Least torque loss was noted in model 1 and most in model 3. Conclusion: After analyzing the three models of different tip values, anterior segment torque change in en masse retraction with the extraction of first premolar can be predicted. Torque change of anterior segment is of functional and esthetic importance in achieving optimal orthodontic treatment results.