Besic F C, Bayard M, Wiemann M R, Burrell K H
J Am Dent Assoc. 1975 Sep;91(3):594-601. doi: 10.14219/jada.archive.1975.0416.
The same elements, 21 in number, were found in both acid-resistant and acid-susceptible enamel specimens by ion microprobe analyses. However, there were differences in the concentrations of 14 elements between groups. Of the 16 trace elements found in enamel, the concentrations of K, F, and Na in parts per million were the greatest. Enamel surface analyses showed V and Zn were more concentrated in acid-resistant specimens by factors of 7.4 and 6.1 respectively, followed by nine other elements, the last molybdenum, that were just slightly more prevalent in acid-resistant enamel. Four elements were equally concentrated in both groups of samples, and only one trace element, B, was more abundant in the acid-susceptible samples by a factor of ten. Ca and P were predominantly more abundant in acid-resistant speciems, and C, H, and O were more concentrated in acid-susceptible samples. The enamel substance in acid-resistant and acid-susceptible groups was found to be similar by these methods. --Ion microprobe: the same elements were detected in both groups. Four trace elements (titanium, lead, Cl, and lithium) were equally abundant in the two groups. --Electron diffraction: the crystal structure type was the same in both groups of samples. --Infrared absorption: the crystalline substance showed the same spectra in both groups. The enamel substance in the two groups of specimens was found to be dissimilar by these methods. --Ion microprobe: the concentrations of 11 trace elements as well as Ca and P were greater in acid-resistant enamel. The concentrations of C, H, O, and B were greater in acid-susceptible enamel. --X-ray diffraction: crystallites in the acid-resistant specimens were larger by a factor of more than two. Enamel solubility appears not to be related to atomic species but associated with one, some, or all elements quantitatively and also with its physical form (crystallite size and probably density).
通过离子微探针分析发现，在耐酸和易酸蚀的牙釉质标本中均存在相同的21种元素。然而，两组之间14种元素的浓度存在差异。在牙釉质中发现的16种微量元素中，钾、氟和钠的百万分之一浓度最高。牙釉质表面分析表明，钒和锌在耐酸标本中的浓度分别高出7.4倍和6.1倍，其次是其他九种元素，最后是钼，其在耐酸牙釉质中的含量仅略高。四种元素在两组样品中的浓度相同，只有一种微量元素硼，在易酸蚀样品中的含量高出十倍。钙和磷在耐酸标本中含量更高，而碳、氢和氧在易酸蚀样品中更集中。通过这些方法发现，耐酸和易酸蚀组的牙釉质物质相似。——离子微探针：两组均检测到相同元素。四种微量元素（钛、铅、氯和锂）在两组中的含量相同。——电子衍射：两组样品的晶体结构类型相同。——红外吸收：两组晶体物质的光谱相同。通过这些方法发现，两组标本中的牙釉质物质不同。——离子微探针：耐酸牙釉质中11种微量元素以及钙和磷的浓度更高。易酸蚀牙釉质中碳、氢、氧和硼的浓度更高。——X射线衍射：耐酸标本中的微晶尺寸大两倍多。牙釉质的溶解性似乎与原子种类无关，而是与一种、几种或所有元素的数量以及其物理形态（微晶尺寸和可能的密度）有关。
