Page 69 - My FlipBook

CASTLNG
53

Casting.
For our purposes we make use of casting—

To make inlays and root pivots
;
To
cast bars for fastening loosened bicuspids
and molars
;
For single tube teeth, if porcelain be not strong
enough.

Inlays that have to serve as abutments or appliance-
supporters should be fitted with pivots.
The making of approximal inlays may be
facili-
tated by putting a greased celluloid strip round the
tooth to be filled.
Cut into the strip where
it extends beyond
the
gnndmg surface, put it on the occlusal surface for
gettmg correct articulation by bite-closure while the
wax is yet soft.
A cavity in the wax inlay may be secured by
droppmg Calxine into the
cavity before taking the
impression.
Before inserting the gold inlay the Calxine should
be removed.
For removing the overhanging wax, rub the margins
of the wax filling with benzine.
As investing material I use either "
River-sand com-
pound " (Sachs) or Nagel's compound, that never shows
fissures, but hardens slowly.
Boedecker's inlay wax will render good service.