Page 799 - My FlipBook

MOVING THE ROOTS OF TEETH. 797

position the roots have not moved with them, and the upper lip is
still too prominent. So also in some cases the palatal portion of the al-
veolar ridge is so dense that it does not yield readily, and as the crowns
move backward the edge of the process acts as a fulcrum and the ends
of the roots move forward. The prominence of the lip is thus increased.
In the World's Columbian Congress, 1893, Dr. C. S. Case showed
casts and models of such cases and appliances by which the roots and
the whole anterior alveolar process can be moved back and the promi-
nence of the upper lip reduced to a normal contour. For illustrations
and descriptions of this operation the reader is referred to Chapter
XXY., and especially to Figs. 847, 853, 854, 855, 896, and 897.
Fig. 823 shows Dr. Farrar's appliance for moving forward the
roots of incisors by working on the lingual side of the arch. " The

Fiirrai's appliance for moving incisor roots forward.

base of support is a transpalatal screw-jack, anchored by two clamp
bands that embrace the side teeth ; from this jack to the posterior sides
of the necks of the incisors and lying close to the sides of the arch are
two other scrcAV-jacks to press against these front teeth. To hold these
jacks upon them, each incisor has upon it a
broad ferrule (cemented) with a U-shaped lug Fig. S24.
on the lingual side, near the gum (see F, in
the lower part of Fig. 823), in which a bar
connecting the anterior ends of the jacks rests.
To hold firmly the end of the crown of each
incisor, and prevent them from moving for-
Avard when these iacks are set at work against
*' •11 Showing attachment of cross-
the necks of the teeth, the ends are tied to the bar.
transpalatal jack by two wire cords connecting
with a crossbar lodged in other U-shaped lugs soldered to the labial side