30例拔除下颌第一前磨牙后下前牙自行调整的临床观察

Clinical Analysis on Self-adjustment of the Anterior Mandibular Teeth after Extraction of the First Mandibular Premolar

目的观察拔除下颌第一前磨牙后下前牙自行漂移的情况。方法收集我院口腔正畸科最近三年拔牙矫治病历,拔除下颌第一前磨牙后,先做上颌的固定矫治,暂不做下颌矫治,待下颌自行调整的正畸病人30例,观察下尖牙自行漂移的情况。结果拔除下颌第一前磨牙后,下尖牙每侧向后漂移2.1mm,下前牙的拥挤度减少4.2mm,spee s曲线曲度也减少了0.8mm。结论直丝弓矫治拔牙病例中,下颌暂不做矫治,先做上颌,随着上颌牙列的整平,下颌牙列可自行调整,下尖牙可向后漂移,下前牙的拥挤度和spee s曲线曲度均可改善。

Objective To observe the self-adjustment of the anterior mandibular teeth after extraction of the first mandibular premolar. Methods A total of 30 patients from case history of clinical orthodontics. Department of Stomatology, the Central Hospital of Panzhihua, were selected. All of them were treated with extraction of the first mandibular premolar, fixed appliance to the upper teeth, and the drift situation of lower canines were observed. Results The average distal drifting stance of the lower canines is 2. 1mm, and crowding of the lower anterior teeth decreases 4.2mm. Conclusion Severe crowding could be successfully treated with first molar extraction, applying fixed appliance to the upper teeth first, by self-adjustment of the anterior mandibular teeth.