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102 METHODS OF FILLING TEETH.
later. It is manifest that the rubber-dam could not be forced above
The therefore was to secure a
the gingival margin. procedure
stout platinum and iridium screw into the root- canal, the pulp having
been removed before I saw the case.
FIG. 100. Around this, amalgam was packed
until it protruded sufficiently to
allow the dam to be placed. At
the next sitting the contour was
completed with gold, the dam being
placed first, and then all the amal-
gam cut away except just sufficient
to allow the dam to remain in posi-
tion. Fig. 101 is a section showing
the relation between screw, amal-
gam, and gold.
Case 4. A young man came to me on one occasion with a first
superior molar from which the crown was lost except the buccal wall,
yet the pulp was alive. A good, serviceable restoration was made
without cutting away the tooth to any material extent. Along the
palatal margin two iridiumized platinum screws were
FIG. 102. and
placed, through the buccal wall itself two holes
were drilled. This wall was strong, and yet of such
form that it was safer to resort to this method than it
would have been to make an attempt to undercut it for
retaining grooves. Fig. 102 shows the tooth as prepared
for These holes were beveled at the buccal side
filling.
so that when the amalgam was placed it extended
which
through, forming headed pins, materially added to the strength
of the
operation.
Case 5. A married woman of forty cime to me for a lower set
of teeth. She still had the six anterior teeth below, but they were in
such a state of dilapidation that she wished them extracted. Exami-
anterior and
nation showed that though badly decayed along posterior
approximal sides, in every instance the pulp was alive. For this rea-
son, and because I considered that a partial lower plate would give
better service than a full denture, I advised saving the natural teeth.
In I found the teeth so narrow and the cavities so exten-
every case,
sive that I despaired of being able to build on the necessary corners,
with of them endure. I resorted to a
any hope having Finally plan
which proved successful. One case will serve for illustration. Fig.
103 shows a lower incisor after the removal of decay. It is seen to be
similar to the superior lateral incisor shown in Fig. 93, where screws
were resorted to. This could not be done in the lower because of the
danger of entering the pulp-chamber. What I did was to connect