牙板向深层的结缔组织内伸延，在其最末端细胞增生，进一步发育成牙胚。
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.
目的：研究ADAM28在小鼠牙胚发育中的时空分布。
Objective:To investigate spatiotemporal expression of ADAM28 in mouse tooth germ development.
目的：观察体外培养的鼠磨牙牙胚发育过程的组织学变化。
Objective: to study the histological characteristic change during the development of mouse molar tooth in vitro.
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