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CLASSIFICATION OF CAVITIES. 223

The buccal, lingual, and cervical margins of a compound approximal
cavity should never be finished with a bur, even of the plug-finishing
variety, but should be smoothed with suitable chisels, broad-faced
excavators, or approximal trimmers, the latter being shown in Fig. 171.
Fig. 170. Fig. 171.

File-cut enamel finishing bur. Approximal trimmer.
The practice of finishing cavity margins with sand-paper disks,
Hindostan-stone points, or wooden points charged with emery powder is
very objectionable, as they are almost certain to give to the margins a
rounded edge which cannot be filled and finished without leaving a
feather edge of tlie filling overlying the enamel, which will eventually
be broken oif or flared up, leaving an imperfect margin.
Classification of Cavities.'
I. Simple Cavities ox Exposed Surfaces.
Bicuspids and Molars. Incisors and Canines.
A. Occlusal. D. Labial.
B. Buccal. E. Lingual.
C. Lingual. F. Incisal.

II. Simple Approximal Cavities.
Incisors and Canines. Bicuspids and Molars.
G. Mesial and distal. H. Mesial and distal.

III. Compound Cavities.
Incisors and Canines. Bicuspids and Molars.
I. Mesio-labial. P. Mesio-occlusal.
/. Disto-labial. Q. Disto-occlusal.
K. Mesio-lingual. R. Occluso-buccal.
L. Disto-lingual. S. Occluso-lingual.
31. Mesio-incisal. T. Mesio-disto-occlusal.
N. Disto-incisal.
0. Mesio-disto-incisal.
^ Following the sugsc^tion of Dr. Black, in the above list the word lingual \9. used
for the same surfaces in both the upper and lower teeth, doing away with the word