Page 775 - My FlipBook

: — ;

LOWER PROTBUaiON. 77-3

had erupted and interlocked with each other. The result was that the
patient could comfortably bring her jaws together only as they had been
newly related."
Dr. Talbot says : ^ I have never been able to jump the bite ....
Were such a thing possible, one of two things must take place. First^
absorption and deposition of bone cells at the weakest part of the jaw

Fig. 777.

Cutter's case after adjustment.
namely at the angle .... Second, there must be a forward movement,
by absorption, of the condyle in the glenoid cavity."
Fig. 778 shows Prof. Angle's method of "jumping the bite" bv
means of a spur imbedded in the lower permanent molar, thus com-
pelling the normal closure of the jaw.

Fig. 778.

Angle's method of "jumping the bite."
Class 10. Lower Protrusion. Etiology.—This irregularity is in
most cases constitutional and may be attributable to the following
causes
(«) Excessive development of the ramus of the lower maxilla, as
shown in Fig. 780—constitutional.
(6) Excessive development of the body of the lower maxilla, as
shown in Fig. 781—constitutional.
(c) The habit of iinger-sucking, in which the finger is hooked over
the lower teeth—ac(|uired.
' Denial Cosmos, vol. xxxiv. p. 791.