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Fig. 26. Photograph of a bicuspid, showing imperfectly a slight groove from atrophy near the
junction of the middle and gingival thirds of the crown. See Tigiu'es 27, 28.
The bicuspid shown in Figure 26 split mesio-distally and the cut surface photographed as
Fig. 27.
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 29.
