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Fig. 22. Photograph of a bicuspid, showing imperfectly a slight groove from atrophy near
the junction of the middle and gingival thirds of the crown. See Figures 23, 24.
Fig. 23. The bicuspid shown in Figure 22 split mesio-distally and the cut surface photo-
graphed as an opaque object. Note a broad zone of shadow in the dentin, extending in a semi-
circular form from the groove on the mesial to the groove on the distal side. See also Figure 25.
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