Yamasaki A, Rose G G, Pinero G J, Mahan C J
J Periodontol. 1987 Jan;58(1):40-5. doi: 10.1902/jop.1987.58.1.40.
An electron microscopic survey was carried out on the human periodontal ligament (PDL), including a part of the gingival connective tissue attached to extracted tooth roots (11 functioning premolars and 6 nonfunctioning third molars) in order to examine the characteristics of microfilaments (6 nm) in cementoblasts and PDL fibroblasts. Microfilaments which were grouped in bundles with semiperiodic dense nodes or in meshworks just beneath the cell membrane were seen predominantly in the cells characterized by their ultrastructurally immature appearance. These microfilaments were more commonly observed in third molar PDL than in premolar PDL and, in general, more conspicuous in cementoblasts than in fibroblasts. The significance of microfilaments in human PDL is discussed, particularly in relation to cell differentiation and morphogenesis.
对人类牙周韧带（PDL）进行了电子显微镜检查，包括附着于拔除牙根的部分牙龈结缔组织（11颗功能正常的前磨牙和6颗无功能的第三磨牙），以研究成牙骨质细胞和PDL成纤维细胞中微丝（6纳米）的特征。微丝主要见于超微结构上呈未成熟外观的细胞中，它们成束状排列，带有半周期性致密结节，或在细胞膜下方呈网状。这些微丝在第三磨牙的PDL中比在前磨牙的PDL中更常见，一般而言，在成牙骨质细胞中比在成纤维细胞中更明显。本文讨论了人类PDL中微丝的意义，特别是与细胞分化和形态发生的关系。
