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DRILLS. 99

of the instrument, to facilitate its approach to the
front proximal surface of a second or a third molar.
(Fig. 6.) A heavy instrument, with a sharp point
Fig.

and a lateral curve, is often efficient in opening up
cavities and cutting down strong projections of ena-
mel. (Fig. 7.) We consider as a very valuable

rig. 7.

form. Every operator should have at hand a suffi-
cient variety to meet every demand—from three to
five sizes of each form.

DRILLS.
Bur Drills.—Of this indispensable class of instru-
ments there are various forms. They should be man-

ufactured of the best steel, and wrought with the
greatest care. After having been forged as near the
proper size as possible, the bulb is shaped by dressing
with a fine file, or which is better, by turning in a
lathe ; those made by the latter method being supe-
rior, and cutting much more smoothly ; they do not
catch and jar as do those of less regular form. After