Page 107 - My FlipBook

DRILLS. 103

rotating one way. This shape is employed principally
for drilling out fangs for filling, or receiving pivot teeth.
The burs and drills may be made of pieces of wire
one and a half inches long, and fitted to a socket-
handle that will accommodate a large number ; or of a
continuous piece of large wire. The latter is the pre
ferable method, since much time is consumed in chang-
ing them in sockets. The handles should be made

with six or eight sides, and cut on each alternate side.
In the use of these instruments, the drill-ring is al-
most indispensable. This is an open ring for the
middle or the index finger, with a socket attached,
in which rests the end of the handle of the instru-
ment. (Fig. 15.) The drill is rotated commonly

with the thumb and fingers.
Fig. 15.

Brill-stocks of various forms have been invented
with the view of increasing the motion of the drill