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784 ORTHODONTIA AS AN OPERATIVE PROCEDURE.
a forward iiioveinent of tlio second molars of their own accord. Treat-
ment of this case was begun in March, 1895, and in August the six
Fig. 796.
B'jon. Afkr.
Double protrusion.
anterior teeth had been moved back till the canine touched the second
bicuspids. (Figs. 793 and 794.)
The same bands and bows were worn about two months longer for
retention, after which the teeth remained firmly fixed. The change in
the contour of both lips was most marked. (See Figs. 796 and 797.)
Fig. 7
Saddle-shaped arch.
The relation of these cases of protrusion to facial contour is dis-
cussed at length in Chapter XXV.
Class 12. Constricted Arch (Saddle -shaped). Etiology.—The
constricted arch may be due primarily to the same cause as the pointed
arch ; that is, («) teeth too large for the jaw, or (b) the first permanent
molar being forward of its natural position on account of premature loss
784 ORTHODONTIA AS AN OPERATIVE PROCEDURE.
a forward iiioveinent of tlio second molars of their own accord. Treat-
ment of this case was begun in March, 1895, and in August the six
Fig. 796.
B'jon. Afkr.
Double protrusion.
anterior teeth had been moved back till the canine touched the second
bicuspids. (Figs. 793 and 794.)
The same bands and bows were worn about two months longer for
retention, after which the teeth remained firmly fixed. The change in
the contour of both lips was most marked. (See Figs. 796 and 797.)
Fig. 7
Saddle-shaped arch.
The relation of these cases of protrusion to facial contour is dis-
cussed at length in Chapter XXV.
Class 12. Constricted Arch (Saddle -shaped). Etiology.—The
constricted arch may be due primarily to the same cause as the pointed
arch ; that is, («) teeth too large for the jaw, or (b) the first permanent
molar being forward of its natural position on account of premature loss
