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PIT AND FISSURE CAVITIES 51

the entire outline of the cavity with a sharp chisel using a light
hand; the desired cavo-surface angle secured, and the bevel angle
buried to the desired depth. The movement of the chisel should
parallel the travel of the external enamel line.
Toilet of the Cavity. The cavity should be swept with a tightly
rolled cotton ball or piece of spunk in the pliers and the dust finally
removed with a blast of air from the chip-blower, and the filling
immediately placed.

Fig. 18.—Class One filled. Cavity shown in Fig. 17.
Inlays. If the cavity is to be occupied by an inlay, retention
form may have been omitted and applied to the cavity just be-
fore setting the filling, in which case the toilet of the cavity should
be repeated. If the cavity has already been given retention form
the same should be temporarily removed while making the model
by wiping into the retaining angles wax, temporary stopping, or
cement to be removed before final placing of the filling.