. A manual of mechanical dentistry and metallurgy . be forced outward, only need covering on thepalatine surface. This is all clearly shown in Fig. the crowns are well fitted and finished, two platinizedgold bars are soldered to their palatal surface and shapedaccording to the form of the palatine vault. To one sidea heavy screw-bar is soldered, while to the other a shorthollow tube, to receive the free end of the screw-bar, is * Dentist to the Court of H. R. M., the Grand Dnkc of Sachsen-Weimar. CORRECTION OF DENTAL IRREGULARITIES. 145 attached. The screw-ljar is prcnided with a nut
. A manual of mechanical dentistry and metallurgy . be forced outward, only need covering on thepalatine surface. This is all clearly shown in Fig. the crowns are well fitted and finished, two platinizedgold bars are soldered to their palatal surface and shapedaccording to the form of the palatine vault. To one sidea heavy screw-bar is soldered, while to the other a shorthollow tube, to receive the free end of the screw-bar, is * Dentist to the Court of H. R. M., the Grand Dnkc of Sachsen-Weimar. CORRECTION OF DENTAL IRREGULARITIES. 145 attached. The screw-ljar is prcnided with a nut, which,after the crowns have been securely set witli cement, isturned up on the bar until moderate pressure is nut is then given two or three turns, three or fourtimes a week, according to the case in hand. The apphancein position is shown in Fig. 103. When it is desirable to expand the low^er maxilla, con-tinuous crowns are made as has been directed, but to eachof these an open cylinder is soldered to the lingual surface. Fig. This is done by fitting and soldering a gold tube over a pieceof piano-wire of the same size as the wire which is to exer-cise the traction. After this is done, the gold tube is cutin its long axis, by which we get the open cylinders. Theposterior ends of these tubes are closed so as to receive theends of the traction wdre when in position. When thecrowms are secured in position wnth cement, a piece of piano-wire, previously shaped from the cast or die, is sprung intothe open tubes. To exercise the necessary traction, thewire must be slightly spread before placing it in the mouth. 146 MECHANICAL DENTISTRY AND METALLURGY. The placing of this wire requires some skill, but is, how-ever, easily understood. To prevent oxidation the wire canbe gold-plated. The wire should be taken out every two orthree days and slightly expanded, then replaced. This ap-pliance is shown in Figs. 104 and 105. Fig. 104.
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