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106 OPERATIVE DENTISTRY

should always be devitalized. In vital cases the inlay may be
used to advantage in plans two and four.
Resistance Form. In this part of cavity procedure the same
care should be exercised as when using the cohesive gold filling.

Fig. 61.— Cavity of Class Four, plan one, for gold inlay. Cavity side of inlay shown.

Fig. 62.—Class Four, plan one, inlay in position. Cavity shown in Fig. 61.
This is particularly true at the incisal edge, where the beveling to
the axial should be quite generous to protect against breaking
down of this margin due to the fact that stress comes at right
angles to the long axis of the enamel rods.