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CORRECTION OF DENTAL IRREGliLARITIES. 143
solder and borax at the union of the Ijand and sheath, apply-
ing heat and turnini^- the hand as desired. It is, however,
rarely necessary, as by slightly bending the arch and shifting
the band, it can in most instances be properly adjusted with-
out changing the position of the tube.
The proper alignment of the sheaths is best effected by
slipping the ends of the arch into them before firmly clamp-
ing the bands.
In order that the patient may become gradually accus-
tomed to the appliances, the bands should be Avorn for two
or three days loosely clamped about the teeth, then the arch
added without ligatures for three or four days more, and

Fig. ioi.

finally all carefully and thoroughly adjusted and the liga-
tures applied for the movement of the teeth. They should
be very light of tension at first. If this be done, the patient
will be more tolerant of conditions during the progress of
the movement.
The elasticity of the arch is sufficient to exert ample force
for widening either of the dental arches, yet in some in-
stances where the patient has reached maturity the force
may not be sufficient to accomplish the desired movement
as rapidly as may be wished. To meet this limitation we
have devised the reinforcement arch L, which should be