However, the regulatory mechanism of crown root development is poorly understood.
然而冠状根发育的调节机制却知之甚少。
Its unable to repair dowel crown because of its shorter root of tooth.
残根太短，一般无法利用桩冠修复。
Anatomy, crown, root natural color, twice the size of normal teeth. a set of 32.
解剖形态，冠、根双色，是正常牙齿大小的两倍。一套32颗。
Objective To compare the residual crown and root of different repair methods of treatment.
目的比较残冠残根不同修复方法的治疗效果。
Objective To compare the residual crown and root of different repair methods of treatment.
目的比较残冠残根不同修复方法的治疗效果。
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