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88 OPERATIVE DENTISTRY

groove in this newly formed pulpal wall, near the dento-enamel
junction next to the lingual plate of enamel. The lingual enamel is
then removed with a chisel thus carrying that portion of the pulpal
wall to a lower level. This process is continued until it is at least

Fig. 46.—Cavity of Class Four, plan two, for cohesive gold.

Fig. 47.—Class Four, plan two, filled. Labial and lingual views. A very popular method.
Cavity shown in Fig. 46.
one-half millimeter to one millimeter lower than the labial portion
of the pulpal wall. This leaves the major portion of the dentine sup-
porting the labial plate of enamel.
^
The Point Angle in the Step Portion should be deepened and made