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6 THE TECHNICAL PROCEDURES IN FILLING TEETH.

and this nomenclature must be understood before the student
can become proficient. In operative dentistry this system of
nomenclature is very simple, and comprises but few words.
However, these words are used in a fairly wide range of combi-
nations that will be very perplexing to the student who has not
a good knowledge of them. Every student who has arrived in
the senior class should know them perfectly in their whole range
of application. He should understand them when spoken by
others, and be able to use them freely and correctly in his ordi-
nary speech. Otherwise he will be unable to understand his
professors or fellow-students as accurately as he should, and thus
find his studies more difficult than they otherwise would be.
For the most part the words are the same as those used in
Dental Anatomy, with which the student should be already
familiar. But they are applied differently, and to different
subjects. This new application becomes a subject of study.
Cavity Preparation.

Cavity preparation includes all those operations required in
the removal of carious material from cavities formed in the teeth
by decay, forming the cavities for the reception of fillings, and
such extensions and preparations as will best fit the affected sur-
faces of the teeth to resist decay in future.
Cavity Nomenclature.
Rule : Cavities in the teeth take the names of the
surfaces of the teeth in which they occur.
We group cavities together according as the decayed sur-
faces are similarly situated. A further grouping may also be
made into classes, each class including those cavities that require
similar treatment.
Cavities which occur in the occlusal surfaces of the teeth are
called occlusal cavities, and occur in the molars and bicuspids,
constituting a group.
Cavities occurring in the buccal surfaces of the bicuspids and
molars are called buccal cavities, and constitute a group.
Cavities occurring in the lingual surfaces of the bicuspids and
molars are called lingual cavities. They are not frequent.
Cavities occurring in the pr03^imate, or proximal, surfaces of
the teeth are called proximate, oKproximal, cavities. These