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The diameter sizes of enamel crevices in cat, man, ape and cattle permanent teethwere measured by the use of an ocular micrometer attached to the optical microscope. The crevice diameter sizes of these four kinds of mammals were found to be in the range of 0.74-1.41 microns, closely resembling one another. On the other hand, thediameter sizes of enamel lamellae in them were in the range of 5.0-85.6 microns and the difference between these two sets of measurement was quite large. Based on the vast difference between the two, the author is inclined to the view that enamel lamellae are an entirely different substance from cracks in the enamel which were invaded and filled by cells from the enamel organ, as has been proposed by GOTTLIEB and long believed by the majority of dental histologists.

Measurement on the Diameter of Crevices in Enamel, especially in Diameter Sizes of Enamel Crevices as Compared with Those of Enamel Lamellae