Schroeder H E
Department of Oral Structural Biology, University of Zurich, Switzerland.
Schweiz Monatsschr Zahnmed. 1993;103(5):550-60.
Following the first description of the formal genesis of acellular extrinsic- and cellular intrinsic fiber cementum on growing human teeth, the present paper introduces cellular mixed stratified cementum as a particular tissue. Based on a large and diverse material (human premolars and molars) that was examined by various methods, such as microradiography, light microscopy using transmitted and polarized light, and scanning- and transmission-electron microscopy, the composition and structure of this type of cementum is described. Cellular mixed stratified cementum covers the apex, the apical third of the roots or more, and the furcational aspects of human teeth. With all methods employed, it was shown that this tissue consists in principle of acellular extrinsic- and cellular intrinsic fiber cementum, i.e. two major types of cementum that alternate or are in irregular sequences deposited upon one another. The dynamics of this layering and the fact, that, temporarily, root surfaces may remain unsupported by Sharpey's fibers as a consequence of this layering, are discussed.
在首次描述了正在生长的人类牙齿上无细胞外源性和细胞内源性纤维牙骨质的正式发生过程之后，本文介绍了细胞混合分层牙骨质这一特殊组织。基于通过多种方法（如显微放射照相术、使用透射光和偏振光的光学显微镜以及扫描电子显微镜和透射电子显微镜）检查的大量多样的材料（人类前磨牙和磨牙），描述了这种类型牙骨质的组成和结构。细胞混合分层牙骨质覆盖人类牙齿的根尖、牙根的根尖三分之一或更多部分以及分叉部位。使用的所有方法都表明，这种组织原则上由无细胞外源性和细胞内源性纤维牙骨质组成，即两种主要类型的牙骨质相互交替或以不规则顺序沉积。讨论了这种分层的动态过程以及由于这种分层，根面可能暂时未被沙比纤维支撑这一事实。
