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Incremental Lines in Human Cellular Cementum : a Histological Study
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| Title: | Incremental Lines in Human Cellular Cementum : a Histological Study |
| Other Titles: | ヒト有細胞セメント質の成長線の組織学的研究 |
| Authors: | 髙橋, 静香 Browse this author |
| Keywords: | Cellular cementum | | Incremental lines | | Contact microradiography | | Scanning electron microscopy |
| Issue Date: | 23-Mar-2023 |
| Publisher: | Hokkaido University |
| Abstract: | 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. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第15484号 |
| Degree Level: | 博士 |
| Degree Discipline: | 歯学 |
| Examination Committee Members: | (主査) 教授 山本 恒之, 教授 八若 保孝, 教授 網塚 憲生 |
| Degree Affiliation: | 歯学院（口腔医学専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/89676 |
| Appears in Collections: | 課程博士 (Doctorate by way of Advanced Course) > 歯学院(Graduate School of Dental Medicine)
学位論文 (Theses) > 博士 （歯学）
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