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Cementum
Cementum〔(【引用サイトリンク】 Cementum )〕 is a specialized calcified substance covering the root of a tooth. The cementum is the part of the periodontium that attaches the teeth to the alveolar bone by anchoring the periodontal ligament.〔Illustrated Dental Embryology, Histology, and Anatomy, Bath-Balogh and Fehrenbach, Elsevier, 2011, page 170.〕
==Development==
Cementum is excreted by cells called cementoblasts within the root of the tooth and is thickest at the root apex. These cementoblasts develop from undifferentiated mesenchymal cells in the connective tissue of the dental follicle or sac.〔
Unlike ameloblasts and odontoblasts, which leave no cellular bodies in their secreted products, during the later steps within the stage of apposition, many of the cementoblasts become entrapped by the cementum they produce, becoming cementocytes. Thus again, cementum is more similar to alveolar bone, with its osteoblasts becoming entrapped osteocytes.〔
Cementum is capable of repairing itself to a limited degree and is not resorbed under normal conditions.〔Ten Cate's Oral Histology, Nanci, Elsevier, 2013, pages 205- 207〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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