Non-pre-colored multi-layer zirconia dental blank that has a gradual change in translucency through a thickness after sintering

  • US 8,936,848 B2
  • Filed: 02/23/2012
  • Issued: 01/20/2015
  • Est. Priority Date: 02/23/2012
  • Status: Active Grant
First Claim
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1. A dental block device for producing a dental prosthesis, the dental block device comprising:

  • a) a green body comprising zirconia;

    b) the green body having multiple different layers each having a different chemical composition between adjacent layers;

    c) the different chemical composition including different amounts of yttria between the adjacent layers;

    d) the green body being substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the layers;

    e) the green body having a brightness/lightness L* value between 10 to 20 for a sample thickness of 1 to 1.3 mm in accordance with CIE L*a*b* colorimetric system; and

    f) the green body being subsequently millable and sinterable to form the dental prosthesis with the multiple different layers having different optical characteristics of translucency.

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