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Optical micrographs showing how cracks grow from tufts at the EDJ in the vicinity of the vertical load axis, in human molar. Specimen is a 1.8-mm-thick longitudinal slice before (A) and after (B) indentation with WC rod (upper cusp not shown). Cracks in B have extended upward from tufts toward the cuspal surface. The faintly visible fringes (Hunter–Schreger bands) mark changes in prism orientation.
