Alternative Appearance of Spiral Prisms in the Gnarled Enamel of Human Teeth

抄録

In gnarled enamel consisting of a spiral arrangement of prisms subjacent to the enamel cusp, spiral prisms, some of which may be transformed into double-bordered prisms, were found by scanning electron microscopy. It has been reported that such abnormal prisms temporarily appear during the formation of normal prisms in the inner enamel. The spiral prisms in the gnarled enamel, however, alternatively appeared in each normal prism. Such an appearance may be related to the spiral arrangement of prisms in the gnarled enamel.