Evaluation dental effects of orthodontic miniscrew and ramal miniplate anchorage used in mandibular arch distalization by finite element analysis

The purpose of our study is to predict the effects of mandibular dentition by comparing the total mandibular arc distalization technique with two different temporary anchorage devices in the patients with class III malocclusion. Two different mandibular model was obtained from BT and formed with 3D Doctors computer program. Brackets, arch wires, miniscrew and miniplates were scanned with 3D scanners and attached to the models as described. In the first model mandibular arch distalization force was applied 300gr from ramal miniplates as Kook et al did in their study, in the second model distalization force was applied 200gr from miniscew as Chang et al described in their study. Changes in mandibular dentition exposed to forces in different vigor and vector were investigated on x, y and z axes. When we look at the results, it is seen that the teeth move in a positive direction in the x- axis of the miniplate and miniscrew group, which is more evident in the anterior and posterior teeth groups in the miniscrew group. In the y axis where the force vector is highest , tipping of the whole arch is greater in the miniplate model than the miniscrew model. In the z axis it is observed that both miniplate and the miniscrew models showed anterior rotation. Anterior and premolar teeth were extruded but molar teeth intruded in the miniplate model. In the miniscrew group there was a general intrusion which was greater in the posterior teeth than the anterior teeth.