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The innermost layer of cementum in rat molars: its ultrastructure, development, and calcification.

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Title: The innermost layer of cementum in rat molars: its ultrastructure, development, and calcification.
Authors: Yamamoto, T.1 Browse this author
Authors(alt): 山本, 恒之1
Issue Date: Oct-1986
Publisher: Japan Society of Histological Documentation
Journal Title: Archivum histologicum Japonicum
Journal Title(alt): 日本組織學記録
Volume: 49
Issue: 4
Start Page: 459
End Page: 481
PMID: 03813823
Abstract: The present study describes the ultrastructure of the innermost layer of cementum (ILC) in the rat molars and discusses its developmental process and calcification mechanisms. The following points are the main results of this study: 1. The ILC is a thin layer, about 2.0μm thick, intensely stained with hematoxylin but not stained by silver impregnation. 2. Electron microscopically, it is composed of substances stained with ruthenium red and chromic phosphotungstic acid presumed to be proteoglycans and a few thin collagen fibrils. 3. Periodontal fibers penetrate the ILC only a short distance, and do not reach the root dentin surface. 4. The ILC begins to form on the root dentin surface, just after the disintegration of Hertwig's epithelial root sheath. At the same time, matrix vesicles and spherical bodies, which may be derived from the matrix vesicles, appear on the surface of the developing ILC. 5. Dental sac cells show higher cell activities than the epithelial sheath cells. Observations support the view that the dental sac cells secrete the ruthenium red positive material. 6. On the basis of the above findings, the ILC is suggested to be formed by the dental sac cells and calcified by the matrix vesicles derived from these cells. 7. The ILC can be regarded as a specialized Cementum between the root dentin and the cementum in the strict sense, serving the connection of the two tissues.
Conffering University: 新潟大学
Degree Level: 博士
Degree Discipline: 歯学
Type: article
URI: http://hdl.handle.net/2115/20153
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 恒之

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