Evaluation of Effect of Cross-Sectional Shape of Orthodontic Wires on Molar Movement Using Digital Image Correlation

Abstract

The effect of the cross-sectional shape of orthodontic wires on the movement of the molars of a lower jaw dentition subjected to distal loads from an implant anchor, a orthodontic wire and brackets is investigated using a three-dimensional digital image correlation technique. The experimental model consists of the lower jaw, teeth, periodontal membranes, an orthodontic wire, brackets and an implant anchor. Orthodontic wires with circular and rectangular cross sections are used. A force of 5.88 N is applied to the wire near the brackets bonded on the first and second premolars and the first molar. The direction of the force from the horizontal is set to 10º, 20º or 30º. Results indicate that the movement of the molars depends on the cross sectional shape of the wire.