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MISCELLANEOUS INSTRUMENTS
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extractor—a smooth broach with a hook on the end, either
at a right or acute angle, used for removing pulps and for
measuring the length of canals.
(3) Barbed broach—cdJidl
cleanser—a broach with small barbs or teeth, used for remov-

ing pulps and for rasping the sides of canals during cleansing
and enlarging operations (Fig. 99). It is made in extra

fine, fine, medium, or large sizes and may be obtained in
packages of six assorted, or in the separate sizes. Prominent
99) and the
forms are the Donaldson, the S. S. White (Fig.

Fig. 102. Ivory universal Fig. 103.—Ivory separator. New form.
double-bow separator.

Fellowship broaches. (4) Twist broach. A tapered spiral

broach, designed and operated on the principle of an auger,
for enlarging or reaming canals (Fig. 100). It is made in
extra fine, fine, medium, coarse and extra coarse sizes, and is
a much safer instrument than the engine reamer. It, as
well as the other varieties of broach, is designed to be used

either in a broach handle (broach holder) (Fig. 1 01) or as a long-
handle instrument. There is also a variety of twist broach
known as a Nub broach (see illustration, Fig. 100) intended for