Page 785 - My FlipBook

DOUBLE PROTRUSION. 783

and lower incisors when the mouth was closed, and was worn except
daring school hours, the patient being a school-girl aged seventeen.

Fig. 793 Fig. 794.

Double protrusion. (Corrected
The bows, which were used only for retention, had their ends secured
in tubes on bands cemented to the first molars. The anterior part of
the upper bow rested in notched bands cemented on the central incisors.
The anterior part of the lower bow was held in place by notched bands
on the lower canines. The nuts of each bow were tightened every
Fig. 795.

Ketaining appliance.
morning just enough to make up for the movement produced by the
cap and bit during the night. There were thus utilized four anchor
teeth in each jaw, the right and left first molars and second bicuspid.
This was sufficient for retention of the six anterior teeth, though it
would not have been sufficient for their retraction. If these anchor
teeth moved forward it was not noticeable, for no space was left between
the first and second molars, though tluit fact might be accounted for by