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Fig. 128. Fig. 129.

Figs. 128-137. The excavation of deep occlusal cavities in the molars, illustrated progres-
sively in ten pen pictures of a cavity in an upper molar, split bucco-lingually. The enamel and
dentin are distinguished definitely in each picture. In this case the tooth represented is from a young
person, in which tlie horns of the pulp arc still very long, and in danger of exposure.
Fig. 128. The distal half of the split tooth, disphiying the carious area in the dentin with
its relation to the crests of the marginal ridges of the pulp. Opening the cavity witli the chisel.
FlQ. 129. Progress of opening the cavity witli the chisel.
Fig. 130. ' Further ijrogress in chipping away the undermined enamel, using the chisel witli
the pulling movement.
Fig. 131. Shaving the enamel walls to form with the chisel, and smoothing them.
Fig. 132. Removing softened material with spoon 20-9-12. In this ease this is done before
squaring up the dentin walls because there is believed to be danger of exposing the pulp of the tooth.
18a