The Dental cosmos . is shown in Fig. 7, the patient calling atintervals of not less than one arch being expanded sufficiently, JACKSON.—ORTHODONTIA. 347 the flange and the metal block for open-ing the bite were removed, permitting theteeth on the right side of the arch to restin occlusion with the teeth of the upperarch, and the same appliance for retain-ing was continued in use. The upper incisors were much tooprominent and needed to be moved in-ward, but as the lower incisors naturallyantagonized with the gum back of them, Fig. their position could not be corrected untilthe lowe
The Dental cosmos . is shown in Fig. 7, the patient calling atintervals of not less than one arch being expanded sufficiently, JACKSON.—ORTHODONTIA. 347 the flange and the metal block for open-ing the bite were removed, permitting theteeth on the right side of the arch to restin occlusion with the teeth of the upperarch, and the same appliance for retain-ing was continued in use. The upper incisors were much tooprominent and needed to be moved in-ward, but as the lower incisors naturallyantagonized with the gum back of them, Fig. their position could not be corrected untilthe lower incisors were depressed in theirsockets. This was accomplished by an ap-pliance adjusted in the upper arch, as il-lustrated in Fig. 8. It was made with apalatal base-wire, and anchored to theteeth by partial clasps and spring claspsin the usual manner. A semicircularspring with U-shaped loops was arrangedto cross the labial faces of the incisors,with the ends, one on each side, passingover the arch at the junction of the ca-nines with the first deciduous molars, tobe united with solder to the anchorageportions of the appliance. To the anterior part of the appliance,back of the incisors and canines, was at-tached a semicircular piece of plate metalabout No. 22 gage, forming a table, rest-ing high above the gum. This openedthe bite by directing all of the force ofocclusion on the lower incisors, gradu-ally depressing them in their sock-ets. The table was sustained and pre-vented from pressing against the gumduring occlusion by two sma
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