Page 325 - My FlipBook

METALLIC PIVOTS. 321

Metal tubes may be introduced into the roots for
the reception of the pivots. These tubes are made of
hollow gold wire of proper size ; the method of pre-
paring which, is, to take a piece of No.-30 gold plate,
from four to six inches long, and from a third to a
half an inch wide, and bend it round a piece of smooth
polished steel wire of the size of the intended pivot;
draw both together through a drawplate, down to one

size larger than the hole in the root ; then take out the
wire, and solder up the tube ; on it cut a fine thread
with a screwplate ; from it cut off from a half to three
fourths of an inch in length, and insert into this a
piece of the wire it was drawn upon grasping this
;
section with a small vice or pair of nippers, screw it
carefully into the root; and having introduced it
far enough, withdraw the piece of wire, cut off the
protruding piece of tube with a fine saw, and file and
neatly polish. The root is thus ready for the recep-

tion of the crown, the pivot of which should fit very
accurately into the tube. A very slight curvature of
the pivot will enable it to retain a very firm hold in
the tube. The tube's inner end may be soldered up
if desirable ; and, if there is decay at the orifice of
the canal, a flange may be soldered on to its outer end,
flush with the end of the root, and the decayed
cavity filled beneath it, the flange serving to retain

the filling perfectly in place. These tubes can be
v