Twin-Arch adjuster

TWIN-ARCH MAX

ADJUSTER

J. FUTTERMAN, D.D.S., NEW YORK, N. Y.

N ADJUSTING the twin arch to the mouth we frequently find that we have I not accurately gauged the distance between the mesial ends of the end sections. This often necessitates a trek back to the laboratory to reinsert the appliance in the vise to pull the end sections apart. To obviate this running back and forth, I have designed a twin-arch adjuster which can be used to make the necessary corrections at the chair. I have found this instrument most helpful. It is made basically of a large inside caliper, with the outer knob removed, another larger

Fig.

1

Fig.

Fig. Fig.

Fig.

L-Twin-arch Z.-Twin-arch

3.-Twin-arch

side,

adjuster, the arms

adjuster. adjuster,

showing

with appliance are pulled apart,

minimum

opening

of beaks

in position. BY turning carrying the end sections 244

when

compressed.

the knob to with them.

the

opposite

2.

TWIN-ARCH

ADJUSTER

245

knob constructed and placed between the arms. The ends of the calipers have been cut down, and openings sufficient to hold the end sections have been cut into them. A millimeter ruler, with one end fixed, has been attached to one of the arms, while the opposite arm supports the free end of the ruler as the accompanying photographs illustrate. When the twin arch is placed into the compressed calipers, the calipers upon the release of the tension will hold the arch extended to the full length of the twin wires. The tension is not strong enough to pull the twin wires through the end sections. However, where the crimping is insufficient, the end sections will pull away, thus avoiding the inconvenience, later, of a faulty arch in the mouth. By turning the knob, the arms are forced apart, pulling the end sections with them until the desired opening is secured. 2021

GRAND

CONCOURSE.