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OXYPHOSPHATES IN COMBINATION WITH COLD.
149
the size of the approximal orifice. If the opening at that point were
small, it will be best not to connect the two cavities further than the
by
tunnel made by the decay.
A condition of this kind is seen in
Fig. 170, Fig. 171 showing pos-
practice. A
terior view of same, and is from a case in lady presented
with a in the crown of a first molar.
leaky gold filling Considerable
decay was found underlying the gold, which upon removal disclosed the
fact that the had reached the
cavity posterior a-pproximal surface, the
opening there being small and near the gum. This tooth and the adja-
cent molar were in close contact, and it was desirable, because of the
patient's enfeebled health, to suomit her to as little annoyance as pos-
sible. The idea of wedging, in order to fill the approximal cavity
was abandoned. The
separately, procedure was as follows. A narrow
was cut from thin German silver and
strip pressed between the molars.
Next a wooden wedge was driven between this strip of metal and the
FIG. 170. FIG. 171. FIG. 172.

adjacent tooth, so that it was forced tightly against the opening of the
cavity, completely covering it. Amalgam was then introduced
the crown and
through cavity packed against the German silver.
The crown cavity was filled with gutta-percha, and the patient dis-
missed till the following day. At her next visit the crown cavity was
filled with gold, using the method of employing oxyphosphate for
This served the additional of
starting. purpose separating the gold
from the amalgam already in place.
I will introduce a second case from practice, of a somewhat similar
character, which received different treatment, though following the
same general principles. A lad of fourteen was in my care for the
regulation of his teeth, which necessitated the contraction of the arch.
As a retainer, bands of pure gold were accurately fitted over the first
molars on each side, and to them was soldered a gold wire which,
around the arch, restrained all the teeth. Subsequently he
fitting
came in for an examination, and I found an old amalgam filling in the
crown of one of these banded molars leaking badly. Upon its re-
moval I discovered the same condition as last described, the caries
having reached the posterior approximal surface. This allowed the
gold band to be seen, as is shown in Fig. 172. This retaining fixture