Pathological changes of a mottled tooth were examined by microradiography and scanning electron microscopy. The tooth was a maxillary right central incisor of a 10-year-old boy, which had been removed by a traffic accident. The boy had lived in Ikuma, Takagi Village, Nagano Prefecture, and had used village water containing about 2.6 ppm fluorine for 6 years,: between the ages of 0 and 5. Under the light microscopy Retzius lines were clearly observed in the enamel, and enamel rods were distinguished by the presence of spaces at the subsurface region. Microradiography revealed that the inter spaces of the enamel rods showed radio-opaque lines which made the enamel rods visible. These changes were clearly demonstrated by scanning electron microscopy. Underneath the surface contract enamel, interenamel rod gaps were present. Within the dentin, interglobular dentin appeared numerously and widely, and in these area no paritubular matrices had formed.
歯牙フッ素症1症例の病理学的検索
