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a)RRKCTH)N OK ])KN TAL IRUKGLILARITIES. •57
eft'ecti\c do\ice, sui^i^cslctl 1)}' Dr. Angle. This is shown
in Fig". 1 18. It will be nutcd that there are two thin gold
bands connected by a spur, with an additional small spur
made to bear upon the mesio-labial angle of the lateral
incisor. The ends of the long spur or wire are secured by
small lubes soldered to the lingual surfaces of the bands, as
Fig. iiS.

shown in the illustration. Direct attachment of the ends
of the wire to the bands by solder is, however, preferable.
A more complicated case of torsion, and the means of re-
taining the teeth in position after treatment is suggested
by Dr. Angle and shown in Fig. 119. This is simply an-
FiG. 119.

other form of the principle of two bands and spurs united.
It demonstrates, however, the extent to wdiich this simple
appliance may be applied.
When the upper arch has been spread, the simplest form
of retention, and at the same the most practicable, for the