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10 THE TECHNICAL PROCEDURES IN FILLING TEETH.

Nomenclature of the Intcrna1-f*arts of Cavities.
In chiving the nomenclature of the internal parts of cavities,
the rules, and illustrations of each rule, will be given. Students
should not burden themselves with memorizing these illustra-
tions, or lists, for if they know the rules and their application
they can make complete lists at any time. This should be prac-
ticed until the walls and angles of any cavity can be named at
sight without hesitation.
Rule : The surrounding walls of a cavity take the
names of those surfaces of the teeth adjoining the
surface decayed toward w^hich they are placed.
Occlusal cavities have —
Illustration
:
A mesial wall,
A buccal wall,
A distal wall,
A lingual wall,
And —
A fifth wall, which is called the pulpal wall, or floor of
the cavity.
Rule : That wall of a cavity which is to the occlusal
of the pulp and in a plane at right angles to the long axis
of the tooth, is called the pulpal wall or floor. In case
the"^pulp of the tooth is removed and the cavity thus
extended to the floor of the pulp chamber it is called the
sub-pulpal wall.
Buccal and lingual cavities have —
Illustration :
A mesial wall,
An occlusal wall,
A distal wall,
A gingival wall.
And —
A fifth wall, called the axial wall.
Rule : That wall of a cavity in an axial surface of a
tooth that covers the pulp is called the axial wall. If
the pulp of the tooth is removed the cavity is extended
to include the pulp chamber and the wall takes the name
of the w^all of the pulp chamber.
Simple mesial or distal cavities (proximate cavities), in the
—
bicuspids and molars, have