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Glass-ceramic and artificial dental crown formed therefrom

  • US 5,246,889 A
  • Filed: 02/26/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A glass-ceramic containing, by weight percentage,


  • space="preserve" listing-type="tabular">______________________________________ CaO 2-17%, K.sub.2 O 0-5% Na.sub.2 O 0-4% ______________________________________
the total content of K2 O and Na2 O being 0.5-7%,


space="preserve" listing-type="tabular">______________________________________ MgO 15-35% SiO.sub.2 30-49% Al.sub.2 O.sub.3 5-30% ZrO.sub.2 2-15%, and fluorine (calculated as F) not more than 14%, ______________________________________ and having at least a zirconia crystal and a mica crystal precipitated.

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