Research of Cranio-occlusional Change of Skeletal Class III Malocclusion in Permanent Dentition Treated by the Multiloop Edgewise Arch Wire Technique

Objective To analyze the mechanics in correction of skeletal class Ⅲ malocclusion with Multiloop Edgewise Arch Wire(MEAW).Methods 15 patients with skeletal class Ⅲ malocclusion were treated with MEAW technique. Cephalometric analysis was performed with pre-treatment and post-treatment cephalograms. Paired t-test was conducted to assess the treatment effects.Results L6-XI decreased by 2.87 mm, L6/MP increased by 8.60°, L1-XI decreased by 2.60 mm, OP/MP increased by 2.33°.Skeleton changed a little. There was no significant change in the soft tissue.Conclusion ①Dento-alveolar compensation is the main change after the treatment by MEAW technique; ②The improvement in molar relationship and overjet is achieved with upright and distal movement of the lower posterior teeth; ③The lower anterior teeth moved lingually and protracted. Occlusal plane is flattened.