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FILLING CANALS 229

and then, again rotating to the left, withdraw a short distance,
continuing in this manner until the broach is entirely free of
the canal and the cotton remains in position.
—
2. When the Cotton is to be Withdrawn on the Broach.
(a) File off the sharp point of the broach or nick it off with a

pair of scissors, leaving it slightly roughened, so that the cotton
will be held more securely, (b) Wrap the broach with the
cotton as already described, except that it should be wrapped
tightly throughout the procedure, (c) Carry the broach into
the canal and on withdrawal, rotate to the rights when the

cotton will remain on the instrument, (d) To remove the
cotton from the broach grasp it firmly between the thumb
and forefinger of the left hand and twist the broach to the
left with the right hand.

FILLING CANALS

It is necessary that the canals to be filled have been
thoroughly treated under aseptic precautions, the saliva
excluded throughout the course of treatments, all debris and
remaining decomposable material removed, and absolute

dryness accomplished.
Drying Canals.—Wrap a few shreds of cotton on a smooth
broach and swab out the canal, absorbing all moisture possible
by changing the cotton on the broach as often as necessary

to accomplish the result. Instead of this proceedure paper
points provided for this purpose by the manufacturers may
be utilized. Then force in a current of hot air from the heated
bulb of the chip blower, or some of the various forms of root
canal driers, until absolute dryness is accomplished, when the

canals are ready to fill.
Requisites of a Good Canal-filling Material.—It should be
I. Non-irritant to the tissues of the apical space.