Page 88 - My FlipBook

56 INSTRUMENTS AND APPLIANCES

ing artificial teeth, and many other cases arising in dental
practice. It should be in the hands of every dental student
and practitioner (Fig. 59).

Instruments are known as Long-handle Instruments if
the handle, shank and blade are all made from one piece of
steel; if the shank and blade or nib are separate from the
handle and intended to be screwed into it, the instrument
is known as a Cone-socket Instrument. Examples of long

handle instruments are shown in Fig. 73, while the Black set
of pluggers seen in Fig. 85 are of the cone-socket variety.
The advantage in the cone-socket instrument is that, if the
working part is broken, it may be replaced at less expense; the
disadvantage is its tendency to loosen at the joint. Students

should see that all cone-socket instruments are screwed tight into
the handles before using.
Bevels.—The blades of some cutting instruments, such
as chisels, are beveled on only one side, while others, such as
Hatchet Excavators, are bi-beveled, that is, beveled on both

sides (see Figs. 60 and 61).
Rights and Lefts.—Instruments are frequently made in
pairs, the angles in the shank throwing the working point of
one to the right and of the other to the left, both instruments
being intended to do the same character of work on opposite
sides of a cavity or the mouth. These are known as Rights

and Lefts. Familiar examples are spoon excavators and
various hand-pluggers. See Fig. 60—Spoons 10, 6, 12 L;
10, 6, 12 R.
Names of Instruments.—The names of instruments are

classified as follows:
1. Order iVame^.—These names denote the purpose for
which the instrument is intended, as excavator, plugger,
chisel, drill, mallet.

2. Sub-order Names.—These define the manner or posi-