Page 85 - My FlipBook

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Fio. 33. A photomicrograph from a portion of a mesio- distal section of a first molar showing in
the section two zones of interglobular spaces. It shows only a part of the mesial half of tuc section.
Note that the line of interglobular spaces nearest the enamel, the first line, follows closely the dento-
enamel junction. This follows the prominence of the mesial marginal ridge of dentin (on the left in
the picture) and then dips down to the gingival. The line of injury to the enamel also rounds over
this prominence and again touches the dentin just above the point of ending of the injury to the
dentin. The second, and more marked zone of injury to the dentin, swings out quickly from the dento-
enamel junction, on the left in the picture, and runs across much deeper in the tooth, showing the
amount of dentin formed before this occurred.