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Fia. 123.

FiQ. 12;'..

Fig. 123. The occlusal surface of an upper first molar, showing a small pit decay.
Fig. 124. The same as Figure 123 after excavating and filling the cavity.
Fig. 125. An upper molar showing the grooves fissured.
FiQ. 126. The same as Figure 125 after excavating and filling the fissured grooves.