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138 FILLING TEETH.
various forms, such as the gouge-, chisel-, and V-
shape : these fit into the clamp, and are grasped by
Fie. 42.
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it, as it is screwed into the handle. (Fig. 42.) By
the use of these instruments the operation will be
very much facilitated, and less jarring communicated
to the tooth ; but after it is used, the bur or fine file
will be required to give a smooth, uniform border to
the cavity. In these cases, the orifice should be
almost or quite as large as the cavity within. In
proximal decay, the cavity must be sufficiently
exposed to enable the operator to see distinctly into
it, and to manipulate freely, in all parts of the
operation. These cavities may be exposed by the
use of the chisel, file, or pressure.
REMOVAL OF DECAY.
After the cavity is opened, the next step in order
is the removal of the decayed dentine. As a general
rule, this should be entirely removed. There is,
