Page 239 - My FlipBook

PREPARATORY TO FILLING 223

the bur does not make sufficient pressure at the
orifice to act somewhat as a piston, and force any
of the putrid contents through the apex. The
europhen paste is then delicately inserted about
a third of the way into the canal, and vaporised
as much as possible with the root drier. More
paste is then inserted half-way down the canal,
and vaporised. Then a third application goes
three-quarters to the apex, and finally the paste is
carried to the apex, and the root drier follows it
risrht to the end of the root. It will be seen that
no attempt is made to clean out the canal in the
ordinary way. The object of this is to cause a
penetrating vapour to go ahead of the instrument,
and this, aided by that most potent germicide, heat,
will probably prevent the possibility of forcing
septic matter through the apex. There is also less
chance of forcing anything through the apex if a
fine smooth bristle or wire is used, than with the
finest barbed canal cleansers or the finest broach
wound round with cotton-wool. After the apex
has been reached with the root drier the canal
cleanser may be used if thought good, and the
root well scraped and filled. The insertion of the
hot root drier causes no pain, but as soon as the
root becomes thoroughly hot the patient will feel a
little pain, and should be instructed to give notice