Crown and Bridge-Work for Students and Practitioners

Crown and Bridge-Work for Students and Practitioners

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...this be done. Should the band be polished at this time, it would be impossible to prevent the polishing wheels from coming in contact with the fusible metal. The surface of the gold of the inner cap would thus become contaminated, so that in fitting the outer band it would in turn become contaminated from the film of the base metal which has been brushed over the inner cap, even though it could not be seen, and the band, at the first annealing, by alloying with the base metals would become so brittle as to be absolutely worthless. It cannot be too strongly impressed upon the reader, the danger of the precious metals becoming contaminated by contact with base metals on the work bench. The greatest care should be used to keep them from unnecessary contact. Even the slightest trace of any of these base metals or alloys will, on the piece being heated, as in annealing or in soldering, entirely destroy the working qualities of the precious metals, so that they are good for nothing until refined and remelted. All pieces swaged or fitted upon base metal dies should be given a bath in nitric acid before annealing or soldering. The bench on which base metal has been used, and the instruments which may have been used around it, should be thoroughly cleansed before again coming in contact with gold or platinum. Making the Outer Cap.--The measurement of the inner cap is taken just below the point where the occlusal end has been rounded (Fig. 383, aa), and the outer band cut from No. 30-gauge coin gold on an angle of the same degree, or even slightly greater than was the inner band (Fig. 374). This is then beveled and sweated together in the same manner as was the inner band, and afterward the lapped joint is hammered over the beck-horn of an anvil or...
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Product details

  • Paperback | 130 pages
  • 189 x 246 x 7mm | 245g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236510291
  • 9781236510297