The root surface in human teeth: a microradiographic study.
The root surface in human teeth: a microradiographic study.
复制标题
人类牙齿的根面：显微射线照相研究。
作者：
Owens Pd
为了阐明人类牙骨质-牙本质连接的性质，制备了不完全形成和完全形成的拔牙的磨碎切片，并将其组织学与其显微放射学外观进行比较。结果表明，不完全形成的牙齿在 Tomes 颗粒层之外具有独特的表面层。证据表明这些层源自牙本质；它们在发育过程中的存在支持了霍普韦尔-史密斯透明层和所谓的中间牙骨质的作者之前的解释。结果还表明Tomes的颗粒层并不代表根牙本质的外部界限。在年轻和老年患者中研究了这些表面层与完全形成的牙齿中存在的确定性牙骨质的关系。从结果可以得出结论，当牙根形成充分推进时，牙骨质开始在牙齿的更顶端区域开始形成，并且牙骨质向牙冠扩散，而不是沿着普遍接受的相反方向扩散。
In an attempt to clarify the nature of the human cemento-dentinal junction, ground sections of incompletely formed and fully formed extracted teeth were prepared and their histology compared with their microradiographic appearances. The results showed that incompletely formed teeth possess distinctive surface layers outside the granular layer of Tomes. The evidence indicates that these layers are of dentinal origin; their presence during development supports previous explanations by the author of the hyaline layer of Hopewell-Smith and of so-called intermediate cementum. The results also indicate that the granular layer of Tomes does not represent the outer limit of root dentine. The relationship of these surface layers to the definitive cementum which is present in fully formed teeth was studied in both young and older patients. From the results it was concluded that cementum formation begins in the more apical region of the teeth at a time when root formation is well advanced, and that it spreads towards the crown rather than in the generally accepted reverse direction.