Conclusion: Bone remodel around the permanent tooth germ resulted from primary tooth orthodontic movement.

结论：狗乳牙正畸移动后恒牙胚牙周组织发生骨改建。

RESULTS:SHIP positive signals were observed in the osteoclasts, odentoclasts and enamel of permanent tooth germ.

结果：SHIP在破骨细胞、破牙细胞和恒牙胚釉质层表达阳性。

The permanent tooth germ plays an important role in physiological root resorption of deciduous tooth, but not the alone factor.

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。

Conclusion Controlled by weaker genetic factors, environmental factors has definite action in occurring course of permanent tooth caries.

结论在恒牙龋齿发生过程中，受较弱遗传因素控制，环境起一定作用。

Root resorption of deciduous tooth without permanent tooth germ was significantly delayed than the deciduous tooth with permanent tooth germ.

恒牙胚缺失的乳牙牙根吸收明显晚于恒牙胚存在的乳牙。