Page 60 - My FlipBook

44 THE TIGHTENING OF LOOSE TEETH
centre of the masticating surface, and force in soft
cement until it flows out on both sides.
For injecting I make use of Belger's cement syringe,
lengthened according to my directions for more con-
venient holding.
In case afterwards it is necessary to give the crown
greater firmness, by means of a spherical burr drill
the tooth 2 millimetres, and place a small screw in
the soft cement.
To produce a screw of this kind I solder a little
piece of thin sheet on to screw-wire, or file strong
screw- wire ; or, lastly, hold the screw-wire perpen-
dicularly in the flame so that a ball is formed, and
with a fret-saw transform it into a screw-head.

Gross-Splints.
To protect large bridges adjusted in the molar
region against being loosened by lateral pressure, the
use of a Bryan splint is required in the upper jaw.
Across the hard palate mark a narrow lead-pencil
curve, about 2 to 3 millimetres wide, on the plaster
model. Deepen the margins about h millimetre from
the palatal suture. Now make a swaging as before
when making the retaining appliance.
Swage a narrow pure gold strip, and on to it bend
the strongest gold wire, either half-round or oval.
Wire and gold-plate being firmly connected by plati-
num wire, place a large quantity of solder on both
sides of the gold-plate up to the extreme pure gold