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.
另一侧不作处理，为牙槽窝自然愈合对照组。
As a control, the other side sockets were left for spontaneous healing.
另一侧不作处理，为牙槽窝自然愈合对照组。
As a control, the other side sockets were left for spontaneous healing.
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