Tveit A B, Halse A
Acta Odontol Scand. 1979;37(6):363-9. doi: 10.3109/00016357909004709.
Seven teeth which showed radiopaque zones beneath silicate fillings were sectioned and studied by microradiography and electron microprobe analysis in order to elucidate which elements were responsible for the increased absorption of X-rays and whether the presence of carious lesions could be masked by foreign elements in the tissue. The Ca concentration was frequently found to be either slightly increased or reduced compared with radiographically unaltered dentin. Increased concentrations of F and Zn occurred in the radiopaque zones. The highest F concentrations (0.4--1%) were recorded in zones with an increased Ca content. The highest Zn concentrations (5--8%) were found in the three specimens having a reduced Ca content. The possible conditions responsible for the increased Ca, F and Zn concentrations are discussed. The results indicate that both Ca and Zn may contribute to the increased absorption of X-rays. The hypothesis that carious dentin may be obscured in intraoral radiographs by the presence of foreign elements in the tissue, was not substantiated.
对七颗在硅酸盐充填物下方显示不透射线区域的牙齿进行切片，并通过显微放射照相术和电子微探针分析进行研究，以阐明哪些元素导致了X射线吸收增加，以及组织中的外来元素是否会掩盖龋损的存在。与X射线检查未改变的牙本质相比，经常发现钙浓度略有增加或降低。在不透射线区域发现氟和锌的浓度增加。在钙含量增加的区域记录到最高的氟浓度（0.4%-1%）。在三个钙含量降低的标本中发现了最高的锌浓度（5%-8%）。讨论了导致钙、氟和锌浓度增加的可能情况。结果表明，钙和锌都可能导致X射线吸收增加。组织中存在外来元素可能会在口腔内X线片上掩盖龋坏牙本质的假设未得到证实。
