Page 321 - My FlipBook

ATTACHMENT OF THE CROWN. 317

of the root from decay, and also to preserve the pivot.
Two or three thicknesses of gold foil, too, may be
placed between the crown and the root, so as to make
a more perfect joint and exclude the moisture. There
is, however, not much advantage in an arrangement

of this kind ; a thin sheet of Hill's stopping placed
in the joint, makes a better adaptation than the gold,
and os artificial may be used for the same purpose,
and in many instances is far better than either Hill's
stopping or gold. The canal in the root above the
pivot should be filled with gold ; though, in cases
where there is a discharge through the root, this
would not be admissible.
The canal at the orifice is sometimes considerably

enlarged by decay, so that when the crown is fitted,
and the canal sufficiently opened for the reception of
the pivot, there will be a cone-shaped space which
the ordinary pivot will not fill. There are several
methods of obviating this difficulty ; one of which is,
completely to fill the enlargement with gold, and then
perforate this filling with the proper-sized drill for the
reception of the pivot; or, which is better, to intro-

duce into the canal a polished steel wire of the size
of the intended pivot; round this consolidate a
filling of gold, having first made retaining points at
the proper places in the dentine ; finish perfectly
flush with the end of the root; and then withdraw