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SENSITIVENESS AT THE TOOTH-NECK.
151
the same be
end secured by gold filling, process may repeated at the
other end.
In uniting teeth, use always gold and platinum, further strengthened
by a triangular iridio-platinum bar. Amalgam will not serve for
these cases, and even gold alone is not durable enough where there is
likely to be much strain. The teeth are first to be bound together
by flax threads, as shown in Fig. 49, if the teeth are two molars, or
as in Fig. 50 when the anterior teeth are involved. If the teeth are
quite loose, it will be necessary to imbed them in oxyphosphate,
leaving only that part exposed which is to be filled. Next the bar is
to be placed in the continuous cavity cut in the crowns of the adjacent
teeth, and cemented to place. When the oxyphosphate has thor-
oughly hardened, as in the case of the bridge-piece, remove it from
one cavity and replace with gold ; the bar being thus secured, the
rest of the cement may be taken out and the operation completed.

CHAPTER VII.

SPECIAL PRINCIPLES INVOLVED IN THE PREPARATION OF CAVITIES AND
THE INSERTION OF FILLINGS SENSITIVENESS AT THE TOOTH-NECK
EROSION GREEN-STAINTRUE CARIES FESTOON CAVITIES THE
LABIAL SURFACE THE PALATAL THE LINGUAL BUCCAL CAVITIES
TEMPORARY FILLINGS THE FINISHING OF FILLINGS.

I HAVE divided cavities into three general classes : approximal,
crown, and surface, the last including all parts not covered by the
other two. Strictly speaking, however, all three of these terms were
intended to apply to that portion of the tooth which is normally
enamel. A in the root of a tooth, and not
covered by cavity existing
at some other is a
owing its inception to caries beginning point, rarity,
which, with a single exception, needs no particular mention in this
work. This exception will be alluded to later.
There is, however, a cavity which in its earliest stages frequently
demands our attention and this I may as well consider now, before
;
taking up surface cavities proper.
Recession of the gum often results in a line of distinct sensitiveness
of enamel at the
along the neck of the tooth just above the bulge
of the anterior teeth.
labial aspect
the occurrence of on brushing the
The patient will report pain
teeth, and that even touching the part with the finger-nail produces
an unpleasant sensation. In the earliest stages an examination may
a corroboration of the facts stated, the tooth
reveal nothing except