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PROXIMAL CAVITIES IN INCISORS INVOLVING ANGLE 89
acute largely at the expense of the pulpal wall. This will place it in
just the right position to resist stress from the probable source and
prevent tipping. (See Fig. 37.)
This Second Plan is Particularly Indicated in cases of nuich wear

I'ig. 48.—Cavity of Class Four, plan three, for cohesive gold.

A B
Fig. 49.—Class Four, plan three, filled. Labial and lingual views. Cavity shown in Fig. 48.
on the ineisal, due to what is called "end-to-end" bite. However,
in such cases all of the exposed dentine on the ineisal edge should
be included in the step and it is not necessary to remove much of
^ither of the labial or lingual plates of enamel. In such cases the