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108 OPERATIVE DENTISTRY

millimeters long, owing to the possibilities of the case. The gin-
gival retention may be accomplished either by using a similar pin
to that used in the incisal, placing the hole for same in about
the center of the gingival Avail, or the plan of retention used in
the gingival wall Class Two may be used. This consists in cut-

I"ig. 65.— Cavity of Class Four, plan three, for gold inlay. Cavity side of inlay shown.

Fig. 66.—Class Four, plan three, inlay in position. Cavity shown in Fig. 65.

ting the two convenience angles in the gingival w'all. In plan
three, non-vital, the pin in the root canal should be used. In plan
four same retention used as in plan two as the case is nearly al-
ways vital.
The Enamel Walls should be Avell beveled, Avhich Avill in no