Incremental Lines in Human Cellular Cementum : a Histological Study

• Material Type: 博士論文
• Title: Incremental Lines in Human Cellular Cementum : a Histological Study
• Author/Editor: 髙橋, 静香
• Author Heading: 髙橋, 静香
• Publication, Distribution, etc.: Hokkaido University
• Publication Date: 2023-03-23
• Publication Date (W3CDTF): 2023-03-23
• Alternative Title: ヒト有細胞セメント質の成長線の組織学的研究
• Degree grantor/type: 北海道大学
• Date Granted: 2023-03-23
• Date Granted (W3CDTF): 2023-03-23
• Dissertation Number: 甲第15484号
• Degree Type: 博士(歯学)
• Text Language Code: eng
• Subject Heading: Cellular cementum; Incremental lines; Contact microradiography; Scanning electron microscopy
• NDC: 497
• Target Audience: 一般
• Note (General): Objectives: Human cellular cementum has incremental lines that demarcate individual cementum lamellae. The structural and functional details of the lines remain poorly understood. This study was designed to examine human cellular cementum by light microscopy, scanning electron microscopy, and contact microradiography and to elucidate the ultrastructure of incremental lines and their significance in cellular cementogenesis. Methods: Longitudinal paraffin and ground sections of human mandibular molars were prepared. Paraffin sections were stained with hematoxylin, or hematoxylin and eosin, or impregnated with silver. Hematoxylin-stained sections were observed by scanning electron microscopy using NaOH maceration. Silver-impregnated sections were further stained with hematoxylin. Hematoxylin-stained ground sections were examined by contact microradiography. Results: The incremental lines were found to be collagen fibril-poor layers. The outer area of each cementum lamella consisted of highly mineralized fibrils involved in constructing an alternating lamellar structure, whereas the inner area consisted of irregularly arranged, less highly mineralized, fibrils. The incremental lines corresponded with the innermost sites of the inner area. Conclusions: On the basis of the obtained findings, we suggest cellular cementogenesis progresses as follows. (1) Cementoblasts alternate between low- to high-activity states. (2) In the earliest low-activity stage, cementoblasts generate poorly mineralized, fibril-poor, incremental lines. (3) As cementoblasts recover activity, fibril-organization and mineralization advance in the cementum. (4) In the high-activity stage, cementoblasts reach full activity and construct the highly mineralized, alternating lamellar structure. (5) Cementoblasts again move into the low-activity stage. (6) The above processes are repeated, and the incremental lines and cementum lamellae are alternately generated.; (主査) 教授 山本 恒之, 教授 八若 保孝, 教授 網塚 憲生; 歯学院（口腔医学専攻）
• DOI: 10.14943/doctoral.k15484; https://doi.org/10.14943/doctoral.k15484
• Persistent ID (NDL): info:ndljp/pid/12912006; https://dl.ndl.go.jp/pid/12912006
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2023-07-08T03:42:34+09:00
• Format (IMT): application/pdf
• Access Restrictions: 国立国会図書館内限定公開
• Service for the Digitized Contents Transmission Service: 図書館・個人送信対象外
• Availability of remote photoduplication service: 可
• Periodical Title (URI): http://dx.doi.org/10.14943/doctoral.k15484; http://hdl.handle.net/2115/89676
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp