Lee D D, LeGeros R Z
Calcif Tissue Int. 1985 Dec;37(6):651-8. doi: 10.1007/BF02554925.
A microbeam diffraction method in transmission electron microscopy has been applied to lattice structural studies of human and shark enamel apatite crystals. The technique allows diffraction patterns to be obtained from very small regions of the specimen (40 nm in diameter) and transfers minimal energy to the sample during analysis. The presence of crystal defects, nonisolated dislocations with the dislocation line positioned perpendicular to the 100-type planes, was observed in the central part of the crystals. Further experiments with acid-etching of crystals containing such defects showed an initial preferential dissolution at the site of these atomic imperfections. The relative abundance of the crystal defects was approximately the same in both human enamel and shark enameloid.
一种透射电子显微镜中的微束衍射方法已应用于人类和鲨鱼牙釉质磷灰石晶体的晶格结构研究。该技术能够从标本的非常小的区域（直径40纳米）获得衍射图案，并且在分析过程中向样品传递的能量最小。在晶体的中心部分观察到晶体缺陷的存在，即位错线垂直于100型平面的非孤立位错。对含有此类缺陷的晶体进行酸蚀的进一步实验表明，这些原子缺陷部位最初存在优先溶解现象。人类牙釉质和鲨鱼类牙釉质中晶体缺陷的相对丰度大致相同。
