Risnes S
Scand J Dent Res. 1985 Apr;93(2):145-52. doi: 10.1111/j.1600-0722.1985.tb01323.x.
A method involving carefully planned sectioning and grinding of human maxillary first premolars, allowing enamel structure to be studied with the SEM in more than one plane at the same time, was employed to demonstrate the extent of Retzius lines within the confines of the three-dimensional enamel cap. It was found that the Retzius lines behaved as could be predicted by the theory stating that the striae represent one-dimensional cuts of two-dimensional, curved growth planes. Retzius lines in adjoining planes were continuous across the edge where the two planes met. In a supernumerary tooth, the surface of its hypoplastic tooth tip was continuous with distinct Retzius lines. The present observations provide for the first time direct morphologic verification of the supposed nature of Retzius lines, with reference to extent and continuity in three-dimensional space.
采用一种涉及对人类上颌第一前磨牙进行精心规划的切片和研磨的方法，该方法能让扫描电子显微镜同时在多个平面上研究牙釉质结构，以此来展示三维牙釉质帽范围内芮氏线的范围。结果发现，芮氏线的表现正如理论所预测的那样，该理论认为这些条纹代表二维弯曲生长平面的一维切割。相邻平面中的芮氏线在两个平面相交的边缘处是连续的。在一颗多生牙中，其发育不全的牙尖表面与清晰的芮氏线是连续的。本观察首次提供了关于芮氏线在三维空间中的范围和连续性的直接形态学验证，证实了其假定的性质。
