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FILLING BY CLASSES AND MODIFICATIONS. 203

into which the gold is consolidated, and built across
from one to the other, and then up from the bottom

to the orifice, when it is finished as usual. Care is
requisite to prevent the gold from overlapping the
tooth. Any projection of the filling, especially beyond
the margin of the cervical wall of the cavity, is very
objectionable; it would afford a lodgment for extrane-
ous substances. The tendency of which is to produce
irritation and decay.

Cavities of this class, which are formed in the de-
pressions of the buccal portions of the teeth, are more

easily filled. Often a simple round cavity is formed,
which may be Entirely prepared with a bur drill. The
method of rilling these cavities will be readily inferred
from the remarks before made. If, however, the decay
extends along the depressions, making a groove-like
cavity, this should be filled by commencing the intro-
duction of the gold at that side of the cavity next the
gum.

1st Mod.—Decay at or near the neck of the tooth,
and partially or wholly overlapped by the free border
of the gum. In this modification the gum is a great
obstacle to the various steps in the process of filling
it is liable to be wounded and to bleed at every touch;
it exudes mucus constantly; and it conducts saliva to

the parts with great facility. To obviate these diffi-
culties, the gum must be removed somewhat From the