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112 INSTRUMENTS FOE, FILLING.

the cavity ; in cylinder or block-filling they are indis-
pensable. These instruments are made of different
forms and sizes—of different forms, to facilitate

access to cavities inconveniently located ; of different
sizes, to accommodate cavities of various capacities.
For a large majority of cases, they require a slight
curve, about half an inch from the point ; for some
cases, however, the curve should be a right-angle.
(Fig. 20.)
Fie. 20.

The points of the pliers, when shut together, should
form the point of a plugging instrument, so that it
may be used to some extent for consolidating the
gold. This instrument should be about five inches
long.
The forms of condensing instruments may be mul-
tiplied to an almost indefinite extent. They are all,
however, but modifications of two or three general

principles. The particular form of the plugging point
will be determined by the form in which the gold is
used. With non-aclhesive gold, small square, round,
sharp points, of various curves, will be required.
(Fig. 29.) These points are easily kept in proper
condition, and, in some instances, are used for years
without any change or repair.