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Methods of manufacturing dental restorations using nanocrystalline materials

  • US 7,806,694 B2
  • Filed: 06/24/2009
  • Issued: 10/05/2010
  • Est. Priority Date: 05/29/2003
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a dental article comprising:

  • forming particulate ceramic material consisting essentially of ceramic crystallites with average size of less than about 20 nm into a dental article;

    sintering the particulate ceramic material without the application of external pressure at a temperature less than about 1300°

    C. to provide a final ceramic material having grains of average grain size exceeding 100 nanometers and not exceeding about 400 nanometers and a final density exceeding 95% of the theoretical density of the ceramic material;

    wherein the final ceramic material exhibits at least 30% relative transmission of visible light when measured through a thickness in the range of about 0.3 to about 0.5 mm.

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