Principles and Practice of Operative Dentistry

Principles and Practice of Operative Dentistry

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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. 1901 edition. Excerpt: ...that can be made of silver and tin. Alloys containing less than sixty-five per cent. of silver are soft, and make soft, slow-setting amalgams. Alloys containing more than seventy-five per cent, of silver are soft, and make frail, slow-setting amalgams; the slow-setting property occurs somewhat suddenly after passing the seventy-five per cent. "Alloys which suffer no alteration in volume when unaunealed shrink when annealed." The tables given on page 311 show the extent of the change produced in the alloys by the process of annealing in the unmodified and the modified silver-tin alloys, and the influence of the modifying metals also upon the shrinkage, expansion, flow, and crushing strength. They also demonstrate the fact that less mercury is required to amalgamate a given sample of alloy when annealed than when unannealed, and that both the flow and crushing stress of amalgams made from annealed alloys are slightly increased. Stability.--The physical property of amalgams designated as stability or rigidity is the antithesis of "flow." That amalgam is the best, other things being equal, which flows the least, --in other words, is most stable, shrinks the least, and has the highest crushing strength. Such amalgams have been said to possess groat "edge-strength." The term "edge-strength" was invented to designate the degree of resistance an edge or an angle of hardened amalgam offers to a force which on being applied might cause it to be fractured. It is evident, however, from the discovery of the property of flow under stress possessed by the "unmodified" and the "modified" silver-tin amalgams, that it will be necessary to modify all former notions in relation to their rigidity, for certain...show more

Product details

  • Paperback | 284 pages
  • 189 x 246 x 15mm | 513g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123652229X
  • 9781236522290