Page 73 - My FlipBook

FLASKING, VULCANIZING AND FINISHING. 6l
of the central incisors backward. The method of repair
in such cases is quite simple, consisting in first accurately
adjusting the two parts of the plate and fastening them in
their correct relation to each other with adhesive wax or
shellac. This should be dropped over the entire length of
the crack by an assistant, \\hile the sections of the plate
are being held in correct apposition. Plaster is then mixed
and poured into the plate, forming a cast of the palatine
surface of the mouth. After this hardens sufficiently, the
wax or shellac is removed, which permits the sections of

Fig. 35.

the plate to be taken up separately. The line of the frac-
ture is now cut out or enlarged upon either side with a
large bur revolved by the dental engine, or it may be ac-
complished with a file or saw. Dovetails are then cut on
either side with a jeweler's saw, and the sections replaced
upon the cast. The work at this stage is shown in Fig. 35.
The openings betw-een the two halves and the dovetail
spaces are then covered w-ith wax, the case invested in a
flask in the usual way, the flask reopened, and wax removed.
The space between the two halves, with the dovetailed