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184 CLASSIFICATION OF DECAYED CAVITIES.

surfaces of the molars and bicuspids, and in the labial
and palatal surfaces of the canines and incisors.
1st Mod.—Extension of the decay beneath the
margin of the gums.
2d Mod.—Extension of the decay so as to involve
a portion of the crown surface.
Third Class.—Anterior proximal cavities of the

bicuspids and molars.
1st Mod.—Extension of the decay toward the neck
of the tooth, beyond the termination of the enamel.
2d Mod.—Extension of the decay so as to involve
a portion of the grinding or crown surface.
Fourth Class.—Proximal cavities of the incisors
and canines.
1st Mod.—Palatal wall of the cavity broken away.
2d Mod.—Labial wall broken away.
3d Mod.—The cavity at the point of the tooth, ter-
minating at the surface.
Ath Mod.—The borders of the cavity very thin, and
the lateral walls inclining to the center.

Fifth Class—Posterior proximal cavities of the
molars and bicuspids.
Modifications same as those of third class.
Modifications common to all the classes : 1st. Su-
perficial cavity and a large orifice. 2d. Deep cavity
and a small orifice.
Modification common to classes three, four, and