The Dental cosmos . anentocclusion. Fig. 9 illustrates an expand-ing and equalizing device adjusted in 348 THE DENTAL COSMOS. the upper arch, with flanges attached oneach side projecting downward from thelingual surface. The appliance is madewith partial clasps and spring-clasp at-tachments, connected by a large palatalbase-wire. Spurs are extended from thedevice to the grinding surface of theupper teeth, in order to prevent the ap-paratus from being pressed against thegum. The flanges, a, a, are made of heavyplate metal, and shaped to project stiffi- flat metal springs. This device is appli-c
The Dental cosmos . anentocclusion. Fig. 9 illustrates an expand-ing and equalizing device adjusted in 348 THE DENTAL COSMOS. the upper arch, with flanges attached oneach side projecting downward from thelingual surface. The appliance is madewith partial clasps and spring-clasp at-tachments, connected by a large palatalbase-wire. Spurs are extended from thedevice to the grinding surface of theupper teeth, in order to prevent the ap-paratus from being pressed against thegum. The flanges, a, a, are made of heavyplate metal, and shaped to project stiffi- flat metal springs. This device is appli-cable for similar purposes in the lowerarch in conjunction with the lingual base-wire. It seldom interferes with mastica-tion. The appliance can be removed bythe patient for cleansing it as would anyother ordinary appliance. Fig. 10 illustrates the position of theteeth of a patient forty-one years of was a case of unilateral prognathism,in which the opening of the bite wasnecessarv for its correction. Fig. ciently on the lingual surface of thelower molars, bicuspids, and canines inocclusion, to guide and cause them toarticulate with the upper ones. In lo-cating the flanges on the appliance itis well to take a bite as for making ar-tificial teeth. Their general contour canbe crimped to fit the lower teeth, or leftsmooth. When it is not desired to changethe shape of the flanges they can be thick-ened with solder. Bending outward thebase-wire slightly from time to timebroadens both the upper and lowerarches. The flanges can be bent out-ward or inward, as required, to furtheradjust the occlusion. When desirable,the flange can also be extended aroundthe anterior part of the arch, as for cor-recting a receding mandible. For someconditions the flanges may best be madeto project in the form of independent The left upper canine and the centraland lateral incisors closed far inside ofthe lower teeth, the lower canine and in-cisors projecting nearly to the upper gumin front of
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