A practical treatise on mechanical dentistry . crownsare constructed of one continuous piece of gold plate, cuspid teeth, however, if they are to be forced outward,only need covering on the palatine surface. This is all clearlyshown in Fig. 234. After the crowns are well fitted and fin- CORRECTION OF DENTAL IRREGULARITIES. 443 ished, two platinized gold bars are soldered to their palatal surfaceand shaped according to the form of the palatine vault. Toone side a heavy screw-bar is soldered, while to the other a shorthollow tube, to receive the free end of the screw-bar, is attache
A practical treatise on mechanical dentistry . crownsare constructed of one continuous piece of gold plate, cuspid teeth, however, if they are to be forced outward,only need covering on the palatine surface. This is all clearlyshown in Fig. 234. After the crowns are well fitted and fin- CORRECTION OF DENTAL IRREGULARITIES. 443 ished, two platinized gold bars are soldered to their palatal surfaceand shaped according to the form of the palatine vault. Toone side a heavy screw-bar is soldered, while to the other a shorthollow tube, to receive the free end of the screw-bar, is screw-bar is provided with a nut, which, after the crownshave been securely set with cement, is turned up on the bar untilmoderate pressure is exerted. This nut is then given two or threeturns, three or four times a week, according to the case in appliance in position is shown in Fig. 235. When it is desirable to expand the lower maxilla, continuous•crowns are made as has been directed, but to each of these an open Fig. Cylinder is soldered to the lingual surface. This is done by fit-ting and soldering a gold tube over a piece of piano-wire of thesame size as the wire which is to exercise the traction. After thisis done, the gold tube is cut in its long axis, by which we get theopen cylinders. The posterior ends of these tubes are closed soas to receive the ends of the traction wire when in position. Whenthe crowns are secured in position with cement, a piece of piano-wire, previously shaped from the cast or die, is sprung into the opentubes. To exercise the necessary traction, the wire must be slightlyspread before placing it in the mouth. The placing of this wire requires some skill, but is, however,easily understood. To prevent oxidation the wire can be gold 444 MECHANICAL DENTISTRY. plated. The wire should be taken out every two or three daysand slightly expanded, then replaced. This appliance is shown in Figs. 236 and 237. Protrusion of the Upper Jaw
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
