. Orthodontia, or malposition of the human teeth; its prevention and remedy . by Prof. Mat-teson,* somewhat on the Angle plan, for the purpose ofmoving forward two inlocked superior central incisors. Aswill be seen, it is firmly attached to the anchor teeth bycemented bands and is operated by turning the nuts wliichrest against tubes soldered to the anchor bands. Should the occlusion not permit the use of the appliancejust described, the same end may be attained by employinga fixture devised by Dr. Kirk f and illustrated in Fig. 76. It consists of a nar-row silver plateswaged to fit andpartly
. Orthodontia, or malposition of the human teeth; its prevention and remedy . by Prof. Mat-teson,* somewhat on the Angle plan, for the purpose ofmoving forward two inlocked superior central incisors. Aswill be seen, it is firmly attached to the anchor teeth bycemented bands and is operated by turning the nuts wliichrest against tubes soldered to the anchor bands. Should the occlusion not permit the use of the appliancejust described, the same end may be attained by employinga fixture devised by Dr. Kirk f and illustrated in Fig. 76. It consists of a nar-row silver plateswaged to fit andpartly cover the roofof the mouth, towhich are attachedtwo broad clasps ofplatinized gold fit-ting the first the buccal sur-faces of these claspsare soldered tubesclosed at their distal Plate, Band and Bar Appliance. (Kirk.) ^^^^-j^ ^^ receivC a gilded piano-wire, bentto conform to the outline of the arch,but slightly longer. When in position, the inlocked centrals are tightly ligatedto the wire immediately in front of them, which by its elas-ticity draws them * Dental Review, Jiily, 92, p. 564.^Dental Cosmos, Vol. XXXIII., p. 908. 136 ORTHODONTIA. Fig. 77. Another appliance, simple in construction and not inter-fering with occlusion, designed to draw one central outwardinto line and at the same time press the adjoining promi-nent one back into place, is shown in Fig. 77. It was devised by Dr. Jackson and is constructed after his method. The firstmolar is fitted with acrib to which the ex-tending spring wire isattached. This engagesat its free end with atubed band cemented tothe inlying central, andin its course rests uponand presses against theprominent central. Adouble movement isthus produced and thepower of the spring may be increased as desired by straight-ening its curve. Still another device, even more simple than the preceding Fig. 78.
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