象牙質柵形成に関する実験的研究 : 第 1 編 形成過程についての再検討
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Numerous reports have been published on the mechanism of dentin barrier formation in the teeth of human and animal using calcium hydroxide as a dressing. However, in spite of extensive studies, these literatures contains conflicting and inadequate informations on the formative process of the dentin barrier. It was therefore proposed to attempt to clarify this problem. Vital pulp amputations were performed on the pulps of 136 root canals of dogs' teeth and the amputated pulps were covered with Calvital (a commercial form of calcium hydroxide). The teeth were histopathologically examined by hematoxylin-eosin stain, azan stain, Gomori's stain and von Kossa's silver method. Results were summarized as follows. 1. The author found that there were two patterns on the process of barrier formation. One pattern was characterized by the dentin barrier being formed immediately below the von Kossa positive granular layer (Ist type), the other by it being formed adjacent to the necrotic layer without being appeared the von Kossa positive granular layer (IInd type). 2. Both of them, the formation of the dentin barrier begins at approximately 7-10 days after pulpotomy and is performed toward the central position of the pulp from the points of the pulp chamber walls on which the dentin barrier is joined. 3. Fibrous elements, from the pulp, which take part in the formation of the dentin barrier matrix change from collagenous fibers into pre-collagenous Korff's fibers in association with the growth of its matrix. This phenomenon is accompanied with the transformation of large funnel-shaped cells into long oval-shaped odontoblasts and the formation of the homogenized matrix on the pulpal surface of the somewhat coarse matrix formed at the early stage in the development of the dentin barrier. 4. Two deep hematoxylin staining lines which are formed in association with performing pulpotomy appear in the root dentin. The deep hematoxylin staining line which exists the lateral position in the root dentin is more general feature than the hematoxylin non-staining layer, previously described by a few investigators. 5. As many investigators has stated, it is considered that the odontoblasts of the dentin barrier is derived from the connective tissue cell of the dental pulp. 6. It is thought necessary to study the necrotic layer and the part of the border between the necrotic layer and the vital pulp tissue by new methods.
- 九州歯科学会の論文
- 1974-03-31
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