[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 degrees, L1-XI decreased by 2.60 mm, OP/MP increased by 2.33 degrees. Skeleton changed a little. There was no significant change in the soft tissue. CONCLUSION: (1) Dento-alveolar compensation is the main change after the treatment by MEAW technique; (2) The improvement in molar relationship and overjet is achieved with upright and distal movement of the lower posterior teeth; (3) The lower anterior teeth moved lingually and protracted. Occlusal plane is flattened.