Page 398 - My FlipBook

396 RESTORATION OF TEETH BY CEMENTED INLAYS.

electric oven made by Ash (Fig. 380) is perfect for low-fusing bodies,
and wherever a current can be secured and low-fusing l)odies are used
this little furnace is to be strongly recommended. Its only drawback
is that it cannot be mended, and that if a burn-out occur it must be
Fj(;. 380.

Ash electric oven.

sent to the manufacturer for a nev/ coil of wire. It has not sufficient
power to melt the high-fusing bodies quickly and well.
The Gold Inlay.—As previously said, the gold inlay has practi-
cally perfect edge strength, and therefore is to be preferred to the
porcelain inlay in the back of the mouth, where its color is no objection
and where its power of resisting mastication is of prime importance.
The following method of making gold inlays is the one advocated by
Dr. W. V. B. Ames, of Chicago :
"The gold inlay is especially useful in compound approximal cavities
of bicuspids and molars. There must be ample separation. As in the
case of porcelain, there should be excavation, both to prevent decay and
to permit the easy removal of the matrix.
"Taking, for example, an occluso-approximal cavity of a soft molar
or bicuspid where a gold or amalgam filling has failed : in such a case
decay has usually extended laterally, one side or both, necessitating
the cutting away of the side walls to such an extent as to leave very