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76 INSTRUMENTS AND APPLIANCES

(i) A smooth broach, in addition to the uses already given,
is also utilized for placing dressings in and drying out canals.
One variety is round, another is square (also known as a Swiss

or Jeweler's broach or reamer) and others are three or five

Fig. 98.—Enlarged barbed broach.

Fig. 99.— S. S. White canal cleaners. (Barbed broaches.)

u
D 678
A B C
I
¥iG. 100.—Kerr twist or spiral broaches. No. i is enlarged. B is a nub-broach.
Nos. 6, 7, 8, are for the engine hand-piece.

Fig. ioi.—Metal broach-holder.

sided. The smooth broach may be obtained annealed or
un-annealed, the un-annealed variety being extremely brittle
and easily broken. For canal work the temper should usually
be drawn, as already described. (2) Hooked broach—hooked