Page 707 - My FlipBook

APPLIANCES, MATERIALS, METHODS, AND FORCES EMPLOYED. 705

Lock-nut.—A second nut screwed up against the first—neces^
sary in some cases to prevent retrograde action by the patient's
tougue.
Labial Bow.—A bow of stiff wire, German silver, or clasp gold,
about No. 16 B. & S. gauge, extending from the buccal surface of the
teeth on one side of the mouth around the arch to a corresponding posi-
tion on the other side. It may be held in place by inserting the ends
in a plate (Fig. 711) or in tubes soldered to bands cemented on suitable
teeth (Figs. 713, 729, 759). The euds of the bow may be screw-cut
and furnished with nuts, as shown in these figures, or bent in bayonet-
shape (Fig. 741).
Lingual Bow.—A similar bow on the lingual surface of the arch,
with the ends inserted in tubes on the lingual surface of bicuspid or
molar bands, screw-cut with nuts (as in Fig. 715 or 716) or bent into
hooks (as in Fig. 667).
Labial and lingual bows are often used advantageously together
and attached to the same teeth, as in Fig. 669 or 713.
Author's Partly- made Appliances.—Fig. 629 shows the writer's
system of partly-made appliances. Each consists of a piece of band-
FiG. 029.

F G H
Partly-made appliances.

ribbon bent into an open loop. To each is soldered a tube, hori-
zontal or crosswise, round or flat, or a wire, in line or at right angles.
These can be made by the practitioner in leisure moments, and kept
in stock. Whon a patient is in the chair, one of the open bands can
be bent around any tooth, with the tube or wire in any position de-
sired. The open ends can then be drawn tightly around the tooth
and the sides burnished to fit accurately. Remove the baud, cut the
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