应用透射电镜观察了大鼠切牙牙本质的超微结构。结果表明，牙本质的胶原原纤维分粗、细两种，从牙本质的牙髓侧向牙表面方向和从牙本质小管附近至其远方，该纤维由细逐渐变粗，由排列疏松变为致密。胶原纤维一般先连接成束，然后以束呈纵行、横向和矢状方向穿行，彼此垂直，交织成网，有的与牙本质小管平行，有的与其垂直，这种排列可能与增强牙承受力的能力有关。牙本质小管内衬有鞘样界膜，该膜可能在控制牙本质的形成中起了作用。 The ultrastructure of dentin in rat incisors was observed by transmission electron microscope. The results showed that the dentin collagen fibrils were divided into coarse and fine fibers. From the direction of the dentin pulp to the tooth surface and from the vicinity of the dentinal tubules to the distance, Dense. Collagen fibers are generally first connected into a bundle, and then to beam longitudinal, transverse and sagittal directions through, perpendicular to each other, woven into a network, and some parallel with the dentin tubules, and some vertical, this arrangement may enhance the teeth bearing Power related to the ability. The dentinal tubules are lined with a sheath-like demarcation membrane that may play a role in controlling dentin formation.