Ultrastructure of striations in carious human enamel.
Ultrastructure of striations in carious human enamel.
复制标题
龋齿人类牙釉质条纹的超微结构。
DOI：
10.1159/000260595
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发表时间：
1982
期刊：
影响因子：
4.2
通讯作者：
Nygaard,VK
中科院分区：
文献类型：
--
作者：
Simmelink,JW;Nygaard,VK
一项相关的显微放射照相-透射电子显微镜研究检查了人类牙釉质中从牙釉质表面到病变体的早期龋齿。在与病变体牙釉质棱镜平行的部分中，交叉条纹突出为 3-4 μm 宽、浅色和深色带。在射线可透的条纹中，晶体的数量和长度均减少，其中一些晶体显示出纵向分裂。在横截面中切割棱柱的部分中，除了与棱柱外围的间隙接壤的等距六方晶体之外，大多数晶体表现出中心溶解。最终，棱柱芯中的晶体完全消失。棱镜边界处间隙的不对称加宽可能与雷齐乌斯条纹有关。讨论了交替条纹中晶体溶解速率差异的可能原因。
A correlated microradiographic-transmission electron microscopic study examined incipient caries in human enamel from the enamel surface through the body of the lesion. In sections parallel to enamel prisms in the body of the lesion, cross-striations are accentuated as 3–4 μm wide, light and dark bands. In the more radiolucent striations, crystals are reduced in number as well as in length with some showing longitudinal splitting. In sections with prisms cut in cross-section, most crystals exhibit central dissolution except for isometric hexagonal crystals bordering a gap at the prism periphery. Eventually a complete loss of crystals from prism cores occurs. Asymmetric widening of the gap at the prism borders may be associated with the striae of Retzius. Possible causes for differences in the rate of crystal dissolution in alternating striations are discussed.