Authors : Laljit Singh Brar, Suresh Babu, Ashutosh Wadhawan
DOI : 10.18231/j.jco.2018.024
Volume : 2
Issue : 3
Year : 2018
Page No : 48-52
Objectives: To evaluate the initial displacement of maxillary anterior teeth under different forces of en masse retraction. To find out the ideal force system for en masse retraction using initial displacement.
Material and Methods: ADENTASCAN was converted into three dimensional Finite Element Model (FEM) of maxilla using HyperMesh software. Two models were constructed having different implant angulations i.e., 45 and 60 degrees. Each model was applied 150, 200, 250 and 300 gm of load. The results were analyzed using ANSYS software.
Results: The maximum initial displacement of 0.095 mm was observed in lateral incisor under 300 gm of load with 45 degrees of implant placement, followed by central incisor and the least displacement was observed in canine.
Conclusion: The amount of initial tooth displacement can predict the favorable force system required for en masse retraction of anterior teeth which according to our study is 300 gm of retraction force at 60 degrees of implant placement.
Key words: FEM, Ideal force system, Initial displacement, Orthodontic tooth movement.