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在混合牙期,萌出后的新生恒牙,根部尚未发育完成。这种牙齿受外伤折断后,应如何处理牙髓,以及脱臼牙复位固定后,其牙根形成的情形,作者根据治疗的病例,综述如下: 牙根形成的模式如图。釉质器形成内釉上皮后,内外釉上皮之间,由两层细胞层形成上皮鞘(图中A)。将来此上皮鞘一方面形成牙根的轮廓,一方面向牙根尖侧方发展,向牙乳头(图中B)表面分化出造牙本质细胞。
In the mixed period, new permanent teeth after eruption, the root has not yet completed development. After the tooth is broken by trauma, how to deal with the pulp, and the deciduous teeth after reset fixation, the formation of the root, the author according to the treatment of patients, are summarized as follows: root formation pattern as shown. After the enamel is formed into the enamel epithelium, the epithelial sheath is formed by two layers of cells between the inner and outer enamel epithelium (Fig. A). In the future, this epithelial sheath forms the contour of the root on the one hand and develops to the apical side of the aponeurosis and differentiates the dentin-derived cells on the surface of the dental papilla (B in the figure).