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Castable glass-ceramic composition useful as dental restorative

  • US 4,515,634 A
  • Filed: 10/17/1983
  • Issued: 05/07/1985
  • Est. Priority Date: 10/17/1983
  • Status: Expired due to Fees
First Claim
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1. A glass-ceramic having high strength and a high softening temperature, consisting essentially of the following constituents, on a mole percent basis:

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    space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 28.5-30.5 SiO.sub.2 57-62 Al.sub.2 O.sub.3 1-2 CaO 5-7 P.sub.2 O.sub.5 1-2.5 TiO.sub.2 0.5-1.5 ZrO.sub.2 0.5-1.5 ______________________________________ wherein the crystalline phase is lithium disilicate, said glass ceramic having a flexural strength of from about 40,000 psi to about 52,000 psi, and a softening temperature of from about 750°

    C. to about 825°

    C.

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