结论：安氏II类2分类错牙合与过小侧切牙、釉质发育不良、先天缺牙密切相关。
Conclusion: Angle Class II division 2 malocclusion is closely related to congenital tooth anomalies.
方法36例临床诊断为功能性安氏III类错牙合的患者，其中男2 0例，女16例。
Methods 36 patients with Angle Class III malocclusion, 20 boys, 16 girls, were treated with modified Andresen Appliance.
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