Methods:A total of 962 patients with malocclusion were selected from outpatient department,among these patients,27 cases with the congenitel hypodontia of mandibular incisor.

 
  • 方法:从962例门诊正畸患者中选取下颌恒切牙缺失者27例,并测量下前牙牙冠的近远中径。
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