POLTAVA STATE MEDICAL UNIVERSITY, POLTAVA, UKRAINE.
Wiad Lek. 2021;74(6):1297-1301.
The aim: The paper was aimed at the study of the processes of mineralization of the enamel of the permanent tooth after its eruption.
Materials and methods: To study the structure of the enamel of permanent teeth has been carried out using light and electron microscopy. The study of the process of the development of the primordia of the permanent teeth involved 10 culled puppies of 30-40 days of age. Microscopic, electron microscopic, immunohistochemical methods of research have been used to study the processes of histogenesis.
Results: The studies show that in the postnatal period, the formation of the crown, externally covered with cuticular epithelium, marks the formation of the primordium of the permanent tooth at the follicle stage. After eruption of a tooth, different parts of its crown have three individual structural and functional barriers to enamel biomineralization. The first one is provided by the cuticular epithelium of the pitted areas of the crown, which ensures filtering of the salivary fluid from the protein deposit in the form of a pellicle. The second barrier is defined on the lateral and cuspidate surfaces of the enamel, where the cuticle is erased or poorly expressed. The third structural and functional barrier of enamel biomineralization is located in the cervical portion of teeth of different classes.
Conclusions: Different areas of the enamel in the tooth crown have specific filtration barriers, which can be distinguished as follows: pit-and-fissure-and-groove, cuspidateand-approximal, and cervical barriers. The cuticle is poorly expressed or totally absent on the cusps of the tooth crowns in contrast to pitted areas.
本文旨在研究恒磨牙萌出后牙釉质的矿化过程。
为了研究恒磨牙牙釉质的结构，我们采用了光镜和电镜观察。研究恒磨牙原基的发育过程，使用了 10 只 30-40 天大的被淘汰的小狗。采用组织发生学的微观、电子显微镜、免疫组织化学方法进行了研究。
研究表明，在出生后时期，形成覆盖有表皮样上皮的牙冠，标志着在滤泡阶段形成恒磨牙原基。牙齿萌出后，其牙冠的不同部位有三个单独的结构和功能屏障，用于牙釉质生物矿化。第一个屏障由牙冠坑状区域的表皮样上皮提供，可确保过滤来自唾液的蛋白质沉积物形式的薄膜的蛋白质。第二个屏障定义在牙釉质的侧方和尖牙表面，其中表皮样上皮被擦除或表达不佳。牙釉质生物矿化的第三个结构和功能屏障位于不同类型牙齿的颈部。
牙冠不同区域的牙釉质具有特定的过滤屏障，可以分为窝沟、尖牙和近中、颈部屏障。与坑状区域相比，牙冠尖牙的表皮样上皮表达不佳或完全缺失。
