Page 238 - My FlipBook
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Fig. 147. A photomicrograph of curled enamel in which the inner two-thirds of the enamel is
composed of interlaced bundles of rods. These straighten up and become parallel in the outer one-
third of the thickness of the enamel. Such enamel splits away from the margin of a break with great
difficulty as compared with enamel having parallel rods.
