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6 THE TECHNICAL PROCEDUEES IN FILLING TEETH.

all occur in positions in which the surfaces of the teeth are
habitually unclean.
With respect to manipulative procedures, each of these
classes has its especial peculiarities. For instance, Class 5,
which includes all buccal, labial and lingual cavities, requires,
in most eases, the use of the Hatch clamp on the incisors and
bicuspids, and the special clamps on the molars to extend the
rubber dam sufficiently to the gingival, and the method of the
instrumentation in their preparation is peculiar to them. Classes
2, 3 and 4 all agree in requiring the use of the separator to give
room for finishing, because all are proximal cavities, but each
of these classes presents especial peculiarities in manipulative
procedure, which will receive attention later.

Nomenclature of the Internal Parts of Cavities.

In giving 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.

walls of cavities.
Rule : The surrounding walls of a cavity take the names of
those surfaces of the teeth adjoining the surface decayed, toward
which they are placed.
—
Occlusal cavities, FigTires 1, 2, have
Illustration :
A mesial wall, m. w.
A buccal wall, b. w.
A distal wall, d. w.
A lingual wall, l. w.
And —
A fifth wall, which is called the pulpal wall, p. w.
That wall of a cavity which is to the occlusal of the
Rule :
pulp, and in a plane at right angles to the long axis of the tooth,
is called the pulpal wall. 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 suh-pulpal ivall.
Buccal and lingual cavities have —
Illustration:
A mesial wall,