High expansion dental crown core ceramic composition

Details High expansion dental crown core ceramic composition High expansion dental crown core ceramic composition

1985-01-09

1986-03-18

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

106 35, 501 59, 501 77, 501 79, C03C 1400

Patent

active

045769222

ABSTRACT:
A strong white ceramic composition and method of making the same wherein said composition is characterized by an average coefficient of thermal expansion over the range of 25.degree. C. to 500.degree. C. ("Proposed American National Standards Institute/American Dental Association Specification No. 38.1 For Porcelain-Alloy Systems") of between 14 to 16.times.10.sup.-6 /.degree.C. and a transverse strength of about 18,000 psi or even greater. The ceramic composition comprises about 40 to 60% by weight crystalline magnesium oxide particles (e.g., 74 .mu.m ) dispersed in a modified silicate glass containing at least 3% by weight of dissolved ZrO.sub.2, TiO.sub.2 or mixtures thereof and is made by firing a powdered mixture of MgO.sub.2 and modified silicate glass at about 1150.degree. C. for sufficient time to produce a fine dispersion of forsterite (Mg.sub.2 SiO.sub.4) in the continuous glass matrix phase along with the crystalline magnesia particles. Such ceramic compositions are useful in high expansion dental crown core applications.

REFERENCES:
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patent: 2980998 (1961-04-01), Coleman et al.
patent: 3069773 (1962-12-01), Saffir
patent: 3504437 (1970-04-01), Siegel
patent: 3649732 (1972-03-01), Brigham et al.
patent: 4101330 (1978-07-01), Burk et al.
patent: 4265669 (1981-05-01), Starline et al.

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