A 16-year-old adolescent female presented with the chief complaint of poor dental alignment and protrusion of the lower teeth. Clinical examination revealed Angle Class III malocclusion accompanied by lower anterior crowding and a protrusive lip profile involving both the upper and lower lips. Cephalometric analysis demonstrated a skeletal Class I relationship with a normal mandibular plane angle. To facilitate anterior retraction, four premolars (15, 24, 34, and 45) were extracted. Following extraction, Improved Super-elastic Ti-Ni alloy wire (ISW) was employed to relieve lower anterior crowding. Canine distalization and anterior retraction were subsequently performed. Elastic chains were used to assist midline correction and tooth derotation, while intermaxillary elastics were applied to achieve optimal interdigitation. The total treatment duration was 5 years and 3 months. At completion, favorable dental alignment and a stable occlusal relationship were obtained.
Jian et al. (Mon,) studied this question.