Page 733 - My FlipBook

PAETIA L ER UPTION. 731

tooth, to prevent the rubl)er band from slipping off. When the tooth is
moved to its desired position it may be retained by substituting a small
Fig. 689. Fig. 690.

Writer's appliance for reducing extrusion. Details of appliance shown in Fig. 689.
platinum wire or silver suture ^\•ire for the rubber band, or three bands
may be soldered together and cemented to the teeth.
Class 5. Partial Eruption.—A tooth may need elevating because
it has not fully erupted or because a piece has been broken from the
cutting edge. If the short tooth is an incisor, proceed as follows On
:
the adjacent teeth cement bands or caps which are connected bv a wire
at or near the cutting edge. On the short tooth, as near the gum as
Fig. 691.

Writer's method of elevating.
possible, cement a wide band which has a hook or pin on both labial
and lingual surfaces. From one hook stretch a very slender rubber
band or tM'isted ligature over the wire to the other hook. (See Fig. 691.)
Less force is required for elevating a tooth than for any other move-
ment, as a conical root is drawn from a conical socket, and care must
be taken not to move the tooth too rapidly lest the pulp be ruptured
at the apical foramen or the peridental membrane be ruptured. If
the wire is soldered on the cutting edges of the caps, it will prevent
the possibility of drawing the tooth too far. For retention substitute
a small platinum or silver suture wire for the rubber band, or apply
three bands soldered together. A broken tooth may be elevated by
means of the same kind of ap])liance (see Fig. 692), and then the cut-
ting edge ground to conform to the other teeth.
For a partially erupted canine an excellent plan is that of Prof.
Angle, shown in Fig. 693.