扫描电镜分析牙齿釉质结构方法的讨论

通过扫描电镜对大熊猫牙齿釉质结构的三维观察与比较,结果表明:在同一枚牙齿上,不同部位的釉质切面,釉柱截面的形状、大小以及排列等,有不同的现象.因此在用上述特征描述时,应对所有要比较的样品,须精确地统一在相同的部位.本文以多次实验结果,表明了严格定位取样的重要性.

DISCUSSIONS ABOUT THE METHOD OF ANALYSIS OF ENAMEL MICROSTRUCTURE WITH SEM

Here are presented odservations with the SEM on various facets of enamel from mammalian teeth. First, three tangential facets with different distances away from the surface of the buccal lateral enamel of the Giant Panda are made as in figure. It shows that the size and shape of the prisms in different facets are varied. The variance of longer diameter are the greatest. Therefore, the length or variance of the longer diameter can not be regarded as characteristic of certain species. Secondly, a longitudinal facet linking the buccal lateral and the lingual lateral through the protocone is also made in the same tooth. Three regions in this facet were observed with SEM from the enamel-dentine junction to the enamel surface respectively. These observations indicate that the variant tendency of the prisms in shape and size are not identical, increasing from near dentine to the surface at cone but decreasing at the concave area. Obviously the variant tendency of the prisms in size can not be regarded as a species characteristic either. On the basis of observation and comparison above, we think that the accurate location is necessary, if we regard shape and size of the prisms as characters for certain species.