Page 140 - My FlipBook
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Fio. 71. The upper first molar, Figure 68, split mesio-distally, the surfaces polished, laid open and
photographed to show the penetration of decay. The specimen shows particularly well the typical
conical form of the penetration of dentin as it occurs when the opening in the enamel remains small.
It also shows well the spreading of decay along the dento-enamel junction of the occlusal surface form-
ing the broad base of the cone of the area of decay.
