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FILLING ROOTS. 283

Such an accident is not very liable to occur with the

tapered broach ; but with the miniature excavator or
barbed wire, it is,—especially in the teeth of the
young, where the foramina through the roots are
large ; and it is especially liable to happen to the
incisors, the canine, and the palatine roots of the
superior molars. But, after the complete develop-
ment of the teeth, there is no excuse for an accident
of this kind ; for then there is an abrupt contraction
of the canal near the point of the root, which may

always be detected by a careful introduction of the
instrument.
The decayed and pulp-cavities and the canal all
being thus prepared, are now ready to receive the
rilling. For filling the root, there are several
methods; one of which is, to prepare small strips of
gold, of two or four thicknesses of foil, take these on
the point of an instrument, and pack them into the

root, in successive folds, till the canal is full. Another
method is, to take small portions of gold, and pack

them in, one on another, till the canal is full.
Another is, to take strips of from two to four thick-
nesses, and from one to two lines wide, and roll them
on a fine broach in such a manner as to make a cone-
shaped block, a little longer than the depth of the
canal to be filled, and of the same taper ; quite a

number of these blocks will be required for any given