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CHAPTER VII.

CLASSIFICATION OF DECAYED CAVITIES.

The following classification of decayed cavities in
the teeth, though from the very nature of the subject
imperfect, will be found sufficiently accurate for the
^purposes of the dental student and the practitioner.
It is based primarily on the position of the cavities,
and secondarily on the extent of the decay ; the classes

having reference to the former, and the modifications
to the latter. The classes are numbered according to
the accessibility of the cavities, beginning with those
most easily approached and operated upon ; and the
modifications according to the extent of the decay,
beginning with the smallest and simplest in form.
First Class.—Central crown cavities in the molars
and bicuspids.

1st Mod.—Extension of the decay along one or
more fissures or depressions.
2d Mod.—Two decays in close proximity on the
same crown, which may be formed into one cavity
for filling.
Second Class.—Cavities in the buccal and palatal