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目的观察乳牙牙本质小管内膜样结构，探讨其结构形态与周围组织的关系及相应功能。方法运用扫描及透射电镜对１６颗乳牙牙本质小管及其管壁纤维进行观察。结果乳牙牙本质小管壁基质纤维的排列既与小管平行又相互交织成网。牙本质经过酸处理后，发现在小管管壁与成牙本质细胞突起之间，有一层呈管状膜样结构存在。此结构可能由未被钙化的或钙化不全的管壁基质纤维和成牙本质细胞突起的分枝组成。结论管状膜样结构可能参与调节牙本质小管管壁的矿化，继而阻止牙本质小管因过度钙化而引起的闭锁。
Objective To observe the endodermis-like structure of deciduous dentin tubules and to explore the relationship between its structure and its surrounding tissues and its corresponding functions. Methods Scanning and transmission electron microscopy of 16 deciduous dentinal tubules and their wall fibers were observed. Results The deciduous dentin tubule wall matrix fibers were arranged both in parallel with the tubules and interwoven into the mesh. After acid treatment of dentin, found in the small tube wall and odontoblast cell protrusions, there is a layer of tubular membrane-like structure exists. This structure may be composed of ungrouped or calcified peritumoral matrix fibers and odontoblasts branching. Conclusion The tubular membranous structure may be involved in regulating the mineralization of the dentinal tubule wall, which in turn prevents occlusion of the dentinal tubules due to excessive calcification.