Page 264 - My FlipBook

232 THE TREATMENT OF PULPS

(a) Moisten the canal with eucalyptol as before.
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(b) Dip a small, smooth broach, on which are wound
few libers of cotton, into softened euca-percha and pump the
canal as full as possible, avoiding forcing the material through

the apex.
(c) Force in on a smooth broach, squared on the end, a
small section of a gutta perch a cone, as large as the canal will
accommodate, and seal the entrance to the canal with a warm
canal plugger or burnisher.
(d) Fill the pulp-chamber with cement.

Callahan^ s Method.—After burning out the organic matter
from the tubules and accessory canals with 40 per cent, sul-
phuric acid, followed by a saturated solution of sodium

bicarbonate, and drying thoroughly, pump the canal full of
chloroform and resin mixture (resin 12 grains, chloroform
3 drams). This mixture permeates and seals the orifices of
the tubules and accessory canals. Then take a gutta-percha
point of suitable size. Insert it into the canal while the resin
is still liquid, and by a pumping motion frequently repeated

(forty to sixty times), dissolve the point in the solution until
the canal is thoroughly filled, thus further forcing the resin
solution into the tubules and accessory canals at the apex, and
filling the main portion of the canal with gutta-percha, which
is slowly transformed into chloro-percha by gradually becom-

ing dissolved in the solution. A recent modification of the
Callahan method is to pump the canal full of chloro-percha
after insertion of the chloroform and resin mixture, and then
insert a suitable sized gutta-percha point. Also, if the apical
foramen be large, it may first be filled by tamping in place a

small section of gutta-percha point, to avoid forcing the
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resin and chloro-percha through the opening.
Other materials occasionally used for filling canals are:
Chloro-percha; oxychloride of zinc cement; parafiin, alone