Page 230 - My FlipBook

226 OPERATIVE DENTISTRY
solution of sulphuric acid, as this Avill dissolve and soften the den-
tinal walls, thus facilitating the enlargement of the canals.
In Cases Where the Root Is Bent on Its Long Axis it is essential
that the broach should be rounded and blunt of point that it may
follow the canal and not cut its side Avail at the bend of the canal,
which will produce a shoulder and hinder further progress. This
is essential with the finest of broaches and requires preparation on
the part of the dentist of every broach used in this class of work,
fis all broaches that come from the factory have a very sharp point
entirely unfitting them for opening crooked pulp canals. This
blunting process is best accomplished by holding the end of the
broach at an obtuse angle on the face of a fine cuttle fish disk while
revolving in a dental engine, at the same time tAvisting the broach
from right to left.
The Carrying of Cotton into a Pulp Canal is of assistance in the
drying process and requires the special preparation of a broach to
facilitate the application.
The Cotton-Carrying Broach is prepared by taking a perfectly
smooth fine hook broach and by grasping Avith a pair of flat-nosed
pliers, say the sixty-fourth part of an inch from the end, rocking
the pliers ])ack and forth until the end is broken off. This results
in a blunt broken surface on the end Avhich engages the fibers of
the cotton twist and prevents same from slipping up the broach
lowai'ds the handle, as it is introduced into the canal, alloAving the
cotton to ])e carried to the depth that the caliber of the canal Avill
permit.
The Cotton Is Applied to the broach by taking a fcAv fibers be-
tween the thumb and first finger, placing around the broach,
tAvisting the handle of the broach to the right, and at the same
lime moving the thumb and finger to roll the broach in the same
direction. The use of Red Cross absorbent points is better
practice.
If It Is Intended to Leave the Cotton in the Canal as a dressing,
roll upon the broach tightly at the point only, and Avhen introduced
to the entire depth of the canal tAvist the broach to the left part of
a turn and use a tamping motion, and the cotton Avill be disen-
gaged and packed in the canal.
If It Is Intended to Remove the Cotton With the Broach, roll
tightly its entire length and Avhen the cotton is being introduced,
as Avell as during AvithdraAval, tAvist the broach to the right con-
tinuously, as this Avill cause the broach to maintain a tight hold on