Page 279 - My FlipBook

INTRODUCTION OF THE GOLD. 277

For packing non-cohesive foil none are better adapted than the set
shewn in Fiu'. 227, made from patterns furnished by Dr. B. J. Bing.

Fig. 227.

11 13 14 15 16 17
Dr. Bing's set of pluggers.

i ill I "^^^^^ ^^* shoukl be supplemented by a small and a medium
li ill B
p-2g(i foot-shaped condenser (Fig. 228), for packing p^^^ 228.
cylinders, mats, or blocks against the cervical wall.
The handles of instruments used for packing
non-cohesive foil should be of such size that they
can be grasped firmly in the hand. AVhen made
of wood they are light in weight and agreeable to
touch. Plugging instruments should have as few
curves and angles as is consistent with the ability
to reach all points in the cavity. As these are
multiplied, direct force is sacrificed. The point of Foot-shaped
condensers.
the instrument should be as nearly as possible in a
line with the shaft. Deviations from this rule are sometimes necessary
in order to reach all points in the cavity. jNIost plugging instruments
have serrated points and are used for all forms of gold. As a rule these
serrations should be shallow, and when cohesive gold is to be employed
they should be only sufficient to prevent slipping, as gold that is quite
cohesive packs as readily with smooth points as with rough ones.