Lithium disilicate glass ceramics

CAFC
  • US 6,517,623 B1
  • Filed: 08/17/2000
  • Issued: 02/11/2003
  • Est. Priority Date: 12/11/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A dental restoration comprising in weight percent:

  • about 62 to about 85% SiO2;

    about 1.5 to about 10% Al2O3;

    about 8 to about 19% Li2O;

    about 2.5 to about 7% K2O;

    about 0.5 to about 12% P2O5;

    up to about 7% CaO;

    up to about 5% ZnO;

    up to about 1% SrO;

    up to about 5% Na2O;

    up to about 7% BaO; and

    wherein the molar ratio of (Na2O+K2O+CaO+SrO+BaO)/(Al2O3+ZnO)≧

    1.3.

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