Couve E
Department of Biology, University of Valparaíso, Chile.
Acta Anat (Basel). 1987;130(4):324-8. doi: 10.1159/000146464.
The thickness of the predentin layer was studied at three different levels of developing human premolars. The results demonstrate that at the growing end next to the apex, where dentinogenesis is most active, predentin exhibits its greatest thickness (mean value 40.4 micron). However, at the coronal region, where primary dentin has been completely formed, predentin width is reduced to a mean value of 14.8 micron. Changes in the calcospheritic configuration of the mineralization front were established for each of the predentin levels studied. A comparative analysis of these calcospheritic changes and the morphology of fluorescent tetracycline lines detected in ground sections of premolars was established. Fluorescent lines observed at the coronal circumpulpal dentin showed large calcospheritic forms beneath the mantle dentin. However, lines found near the dentin-pulp border showed small calcospherites. It is concluded that the thickness of the predentin layer and the mineralization front configuration vary as a function of dentinogenic activity during development of human premolars.
在人类正在发育的前磨牙的三个不同水平研究了前期牙本质层的厚度。结果表明，在靠近根尖的生长端，牙本质形成最活跃，前期牙本质呈现出最大厚度（平均值40.4微米）。然而，在已完全形成原发性牙本质的冠部区域，前期牙本质宽度减小至平均值14.8微米。针对所研究的每个前期牙本质水平确定了矿化前沿的球粒状构型变化。对这些球粒状变化与在前磨牙磨片上检测到的荧光四环素线的形态进行了比较分析。在冠部牙髓周围牙本质观察到的荧光线显示，罩牙本质下方有大的球粒状形态。然而，在牙本质-牙髓边界附近发现的线显示有小球粒。得出的结论是，在人类前磨牙发育过程中，前期牙本质层的厚度和矿化前沿构型随牙本质形成活动而变化。
