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目的:评价下颌第一磨牙拔除进行正畸治疗安氏Ⅲ类错关系的疗效,第二磨牙向前移动代替第一磨牙的适应症,支抗控制方法等。方法:选择正畸门诊16例Ⅲ类错关系并伴有下颌第一恒磨牙残冠、残根或牙冠大面积充填,在患者知情同意下拔除第一恒磨牙,使用直丝弓技术进行矫治。结果:所有16例病例均拔牙间隙完全关闭,无近中倾斜及舌倾现象。双侧磨牙Ⅰ类关系,面角减少,患者侧貌较直,取得较为满意的矫治疗效。结论:拔除下颌磨牙结合矫正技术可成功矫治恒牙期轻度骨性Ⅲ类错畸形,并使患者软组织侧貌发生明显改变。
Objective: To evaluate the curative effect of mandibular first molar removal on Angle Ⅲ malocclusion, orthodontics of second molars instead of first molar, and supportive control methods. Methods: Sixteen patients with type Ⅲ malocclusion were selected for orthodontic treatment and were accompanied with the crown, residual root or crowns of the first mandibular permanent molars. The first permanent molars were removed with the informed consent of the patients and the straight arch technique was used Correction. Results: In all 16 cases, the tooth gap was completely closed with no near-mid-tilt and lingual tilt. Bilateral molar Ⅰ relationship, reduced face angle, the patient’s profile is straight, and achieved more satisfactory curative effect. Conclusion: Removal of mandibular molars combined with orthodontic treatment can successfully treat mild skeletal class Ⅲ malocclusion in permanent dentition, and cause obvious changes in soft tissue profile.