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282 FILLING ROOTS.
elastic and of low temper. A set of instruments for
forming the canals in the roots of the teeth have been
devised and made by Dr. C. Palmer. These are of
such forms and sizes as to be suitable for every
case. They are represented in Fig. 54. Before
Fie. 54.
the introduction of these instruments, the method of
forming these canals was by the use of a three or
four-sided broach, tapering to a sharp point, and in
inclination corresponding as far as possible to that of
the canal. This instrument was employed to enlarge
the canal, and give it a regular shape ; a variety
should be at hand, so that one of the proper size and
taper can be selected. In cleansing and forming the
canal, care is necessary to prevent the instrument
from passing entirely through the point of the root.