Anterior teeth torque and posterior anchorage need in anterior retraction: ۳D analysis using finite element method

Aim: Anchorage management is a challenging problem while retracting anterior segment in orthodontic treatments. The purpose of this study is to evaluate the effect of anterior teeth labiolingual inclination on the amount of anchorage loss and distance of anterior retraction.Methods and Materials: Six ۳D computer models of an upper anterior segment were designed in SolidWorks ۲۰۰۶ (SolidWorks, Concord, Massachusetts, USA).The models contained supporting structure, upper central and lateral incisors, their PDLs, the brackets and an anterior retraction arch wire with two vertical open loops. The models were the same except for the torque of anterior teeth which were ۰, ۵, ۱۰, ۱۵, ۲۲, and ۳۵ degrees consequently. ANSYS Workbench Version ۱۲.۱ (ANSYS Inc., Southpointe, Canonsburg, PA, USA) was selected for the analysis. At each analysis, the end points of the arch wire were displaced distally simulating the anterior retraction arch wire activation. The displacement produced in the labio-mesio-incisal point angle and the mesializing force applied to the terminal molar was assessed.Results: Torque degree of ۰ to ۲۲ exerting almost equal force on anchorage unit during retraction while ۳۵ degrees of torque causing more reciprocal force. Ten degrees of anterior torque resulted in maximum displacement of anterior segment.Conclusions: To have maximum anchorage and faster anterior teeth movement during retraction degree of torque suggested to be about average and neither too protruded nor uprighted.

کلیدواژه ها:

Anterior tooth torque ، Anterior retraction ، Posterior anchorage