Page 224 - My FlipBook

2o8 THE TREATMENT OF TEETH
one-sixteenth of an inch projects beyond a small
shoulder, on which is placed a small piece of
imvulcanised rubber. The end of the needle is
then placed in the exposure (first having obtunded
the exposed part by laying a small crystal of cocaine
and eucaine on it, and allowing them to be dissolved
in the moisture or exudation of the pulp.
The removal of a pulp after pressure anaesthesia
is generally followed by profuse hsemorrhage. This
is sometimes troublesome, and can be entirely
avoided by discarding the pulp extractor and sub-
stituting the Evans root-canal drier. If the bulb of
this instrument is made very hot, the insertion of
the wire completely and immediately burns up and
carbonises the pulp ; in some cases it will come out
sticking to the wire. This causes no pain, and is
a very safe and thorough means of removing pulps
in all cases. Care should be taken to pass the wire
up the canal before heating it, so as to be assured
it will readily pass right up to the apex and not
heyond it. Several sizes of the silver points or wires
should be at hand in order that a suitable one
may be selected ; if necessary the wu-e can be
easily reduced in size with a fine cut file. Nerv-
ocidin (an alkaloid obtained from the bark of the
gasu-basu, an East Indian plant) has been recom-
mended as a safe and satisfactory drug for anaesthet-