Porcelain coating compositions for low expansion porcelain cores and the resulting all-ceramic dental restorations
AssigneeAmerican Thermocraft Corporation
InventorsCarlino Panzera, Jana N. Pruden, Richard A. Brightly
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Abstract
An all-ceramic dental restoration comprising a ceramic core over and at least one coating thereon of a porcelain composition having a maturing temperature of from about 850.degree. to about 1050.degree. C. and a coefficient of thermal expansion of from about 4.0 to about 13 (room temperature to 500.degree. C.) parts per million per .degree.C. comprising: ______________________________________ Component Amount (Wt. %) ______________________________________ SiO.sub.2 69-75 Al.sub.2 O.sub.3 4.0-9.5 Na.sub.2 O 5-10 K.sub.2 O 0-4 CaO 0-1.5 MgO 0-6 B.sub.2 O.sub.3 6-15 F 0-3 ______________________________________
Claims13
An all-ceramic dental restoration comprising a ceramic core and at least one coating thereon of a porcelain composition having a maturing temperature of from about 850.degree. to about 1050.degree. C. and a coefficient of thermal expansion of from about 4.0 to about 13 parts per million per .degree.C. from room temperature to 500.degree. C., said porcelain composition comprising:
- ______________________________________ Component Amount (Wt. %) ______________________________________ SiO.sub.2 69-75 Al.sub.2 O.sub.3 4.0-9.5 Na.sub.2 O 5-10 K.sub.2 O 0-4 CaO 0-1.5 MgO 0-6 B.sub.2 O.sub.3 6-15 F 0-3. ______________________________________
An all-ceramic dental restoration comprising a ceramic core and at least one coating thereon of a porcelain composition having a maturing temperature of from about 900.degree. to 1000 .degree. C. and a coefficient of thermal expansion of from about 5.5 to about 8.5 parts per million per .degree.C. from room temperature to 500.degree. C., said porcelain composition comprising:
- ______________________________________ Component Amount (Wt. %) ______________________________________ SiO.sub.2 71-74 Al.sub.2 O.sub.3 6.0-8.0 Na.sub.2 O 6.0-8.0 K.sub.2 O 2-4 CaO 0.8-1.5 MgO 0-2.0 B.sub.2 O.sub.3 7.0-10.0 F 0-2.0. ______________________________________
A porcelain composition having a maturing temperature of about 925.degree. C. and a coefficient of thermal expansion of from about 5.8 to about 6.2 parts per million per .degree.C. from room temperature to 500.degree. C., comprising:
- ______________________________________ Component Amount (Wt. %) ______________________________________ SiO.sub.2 73.1 Al.sub.2 O.sub.3 6.85 Na.sub.2 O 6.85 K.sub.2 O 3.6 CaO 1.3 MgO 0.8 B.sub.2 O.sub.3 7.5 ______________________________________
Dependencies are inferred from the claim text.