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16 THE TIGHTENING OF LOOSE TEETH

cotton between the pure gold and the counter-die to
protect the die, and to avoid cracking of the thin pure
gold-plate.
Now place a smaller band of 22-carat gold-plate on
the pure gold, and swage once more. Cut the 22-carat
gold-plate to the size of the appliance to be made,
and file. Allow the pure gold to overlap 1 millimetre.
Next place both on the plaster model, and by means
of steel burnishers burnish them firmly. To secure a
perfect fit, it may be found advisable to press the swaged
pure gold-plate separately into place in the mouth.
Hold both stamped gold-plates together by means

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Fi(4. 12.
of spring clamps, place small pieces of gold solder on
the larger pure gold margin, and solder until the
solder flows evenly (Fig. 12).
The retaining-wall ground and trimmed, place it in
the patient's mouth, and with the lancet burrs, as
before, drill through the holes of the teeth.
Begin with drilling through a canine ; pass a pin
through, but so that, the head being inwards, it may
fix the retaining-wall.
Be careful not to displace the retaining-wall in
drilling. To avoid this, press with the left hand the