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PROXIMAL CAVITIES IN INCISORS INVOLVING ANGLE 91
cavity has been left for separate consideration. The plan given is
a modification of plan three, using a lingual step not unlike the oc-
clusal step in a class two cavity.
50.—Cavity of Class Four, plan four, for cohesive gold showing maximum anchorage
l'*ig.
with a minimum loss of dentine. The use of this plan is advised when the lingual stress is
great.
A B
Fig. 51.—Class Four, plan four, tilled. Labial and lingual views. Cavity shown in Fig. SO.
Access is an easy matter as the decay is in the most prominent
I)art of the distal surface and a little M'ork with the chisel gives a<»
cess to the cavity.