Page 318 - My FlipBook

314 PIVOT TEETH.

this purpose. It is a method now very seldom em-
ployed.
Still another method of making an articulation is.
to dress up the root as first described ; then take an
impression of the part in plaster of Paris ; and from
this, get a model, to which to fit the crown. This

method, however, is advisable only in cases where it
is desirable to avoid annoyance to the patient by a
tedious fitting process.

ATTACHMENT OF THE CBOWN.

The means of attachment in most common use is
that of wood pivots; for which, wood in the natural
condition is ordinarily employed, though it is much
improved by compression. The kind best adapted
for pivots is the fine-grain, tough, slow-growth hick-
ory, of straight, uniform fiber, which should be
thoroughly seasoned. For its preparation, take
blocks, six or eight inches long, and split them into
rods, about one fourth of an inch square ; then, with

a knife and file, dress them down to a size one third
greater than that of the intended pivots ; afterward,
pass them through three or four holes of the ordinary
drawplate inverted, thus making them of uniform
thickness throughout : and finally, turning the draw-
plate, pass them through it in the same manner as