. A manual of mechanical dentistry and metallurgy . w bethoroughly dried, then held together in the proper relation-ship, and secured in this position by running warm adhesive(resin) wax over the palatal portion of the tooth, attachingthe backing to the cap. It should then, before the waxgets very hard, be carefully carried to position upon theroot, when any correction in the position of the tooth canreadily be made. Now apply a drop or two of cold waterfrom the syringe or on a pledget of cotton; this will hardenthe wax, so that the crown may be removed without chang-ing the position of the to
. A manual of mechanical dentistry and metallurgy . w bethoroughly dried, then held together in the proper relation-ship, and secured in this position by running warm adhesive(resin) wax over the palatal portion of the tooth, attachingthe backing to the cap. It should then, before the waxgets very hard, be carefully carried to position upon theroot, when any correction in the position of the tooth canreadily be made. Now apply a drop or two of cold waterfrom the syringe or on a pledget of cotton; this will hardenthe wax, so that the crown may be removed without chang-ing the position of the tooth upon the cap. It will then beready to be invested for soldering. Investing.—A most suitable investment for crown workis marble-dust and plaster, ecjual parts, with a small cjuan-tity of fine asbestos fiber thoroughlyincorporated. After the investmenthas thoroughly set, the wax may be re-moved and the surface of the backingand cap cleansed by directing upon ita small stream of boiling water. Theinvestment should be cut away so as to Fig. 1/2 MECHANICAL DENTISTRY AND METALLURGY. expose the sides of the backing and the lower l)order of theband, as ihiistrated in Fig. 137, but every portion of theporcelain should be protected. Soldering and Finishing.—The case should then be atfirst gently heated up to drive off the moisture, then trans-ferred to the soldering block, when, with the heat should be applied until the investment and toothare thoroughly and evenly heated throughout. Gold k., is then cut in small pieces and placed, with a littleborax, over the aperture betw^een the backing of the toothand the cap. The investment being now uniformly heated,the flame from the blow^pipe should be directed upon thesolder, mostly in the direction indicated in Fig. 137, when,if the entire case has been previously brought to a red heat,the solder will readily melt and flow between the tooth andcap. Additional solder should now be added and melteduntil the p
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