结论：狗乳牙正畸移动后恒牙胚牙周组织发生骨改建。
Conclusion: Bone remodel around the permanent tooth germ resulted from primary tooth orthodontic movement.
恒牙胚缺失的乳牙牙根吸收明显晚于恒牙胚存在的乳牙。
Root resorption of deciduous tooth without permanent tooth germ was significantly delayed than the deciduous tooth with permanent tooth germ.
恒牙胚是引起乳牙生理性根吸收的重要因素，但却非唯一的因素。
The permanent tooth germ plays an important role in physiological root resorption of deciduous tooth, but not the alone factor.
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