Risnes S, Radlanski R J, Renz H
Department of Oral Biology, Faculty of Dentistry, University of Oslo, Norway.
Arch Oral Biol. 1998 Feb;43(2):111-5. doi: 10.1016/s0003-9969(97)00105-2.
On the developing enamel surfaces of fetal human deciduous teeth, many of the surface pits were arcade-shaped with the arcade preferentially pointing in a cervical direction. The configuration of the interprism ridges between the pits contributed to this appearance. Surface cracks allowed verification of an incisal inclination of the subsurface prisms. This apparent paradox was solved when the specimens were tilted so that the pits were viewed in the directions of the prisms, giving the pits a compressed arcade-shape with the arcades pointing incisally. It is recommended that care should be exercised and due attention paid to the angle of observation when determining the orientation of pit arcades. Pit entry direction seems to be a more reliable feature for inferring the direction of tangential ameloblast movement.
在人类胎儿乳牙正在发育的釉质表面，许多表面凹坑呈拱廊状，拱廊优先指向颈部方向。凹坑之间的柱间质嵴的形态促成了这种外观。表面裂纹使得能够验证表面下棱柱的切端倾斜度。当标本倾斜，使得从棱柱的方向观察凹坑时，这个明显的矛盾就得到了解决，此时凹坑呈现出压缩的拱廊状，拱廊指向切端。建议在确定凹坑拱廊的方向时应小心谨慎并充分注意观察角度。凹坑的入口方向似乎是推断成釉细胞切线运动方向更可靠的特征。
