Page 199 - My FlipBook

PORCELAIN INLAYS 183

melting or fusing point is reached, and then, if
possible, keeping the heat at this point until the
desired degree of fusion is attained. To place an
inlay, or any other dental porcelain work in a
red-hot furnace, or to attempt to save time by
bringing up the heat as rapidly as possible, is a
mistake. There is, however, no necessity to slowly
cool an inlay. Whatever may apply to porcelain
crowns, where the pins of a plate tooth, or a
platinum band or post have to be taken into
consideration, or to a porcelain bridge that is fused
around a bar, or connected with metal attachments,
does not apply to an inlay which may be removed
from the furnace as soon as it is fused. It is
usually advisable to stop just short of complete
fusion during the several bakes, until the work is
placed in the furnace for the last time. Slowly
cooling down seems only necessary when an inlay
is ficsed around a porcelain core or other piece of high-
fusing porcelain.
The colour of the Jenkins inlay, judging by the
sample shades, is not quite so " tooth-like " as the
higher-fusing bodies, but it is good enough for all
practical purposes, as it is not so much a ques-
tion of exactly matching a tooth, as producing a
match or blend that defies detection at ordinary
speaking distance. There is often a wide differ-