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ISO MECHANICAL DENTISTRY AND METALLURGY.

were l^eing retracted, the bicuspids are laced to the wire arch
and the cuspids are spread by means of a jack-screw, or
may also be laced to the arch. Rubber ligatures are applied
as shown on the left side of the arch in the illustration.
Sections of bone were cut from the palate as indicated by
the crescent-shaped markings, in order to expedite the move-
ments of the central incisors. Force was exerted upon the

Fig. 1 10.

incisors by means of the head-gear in the usual way, and in
this case, it being desirable to make tooth movements as
rapidly as possible, the head-gear was worn almost con-
stantly for six wrecks. The next illustration (Fig. iii)
shows the remarkable results at the expiration of that time.
The relation of the lower teeth is here also indicated by a
dotted line.
Protrusion of the Lower Jaw.—W'hen this deformity is
slight, it may usually be corrected by drawing the lower
incisors in and the upper ones outward. Where the case is
a pronounced one, there is no remedy except the retraction