Two-phase dental forcelain composition
March 12, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLeucite-containing porcelains and method of making same Leucite porcelain High strength feldspathic dental porcelains containing crystalline leucite Dental ceramic material with a relatively low processing temperature Ceramic material for veneering metallic dental protheses Dental ceramic material with a relatively low processing temperature Dental procelain, a method of producing a dental restoration, a dental alloy Low-fusing temperature porcelain Patent #: 5552350 InventorsAssigneeApplicationNo. 614044 filed on 03/12/1996US Classes:106/35, Dental433/202.1, Tooth construction433/217.1, By lining or coating433/222.1, Composite501/6, Alkali metal aluminosilicate crystalline phase501/25, Halogen containing501/57, Fluorine501/64And yttrium or rare earth (i.e., elements with atomic numbers 39 or 57-71)ExaminersPrimary: Group, KarlAttorney, Agent or FirmInternational ClassC03C 010/10AbstractA two-phase porcelain composition for dental restorations comprising a leucite crystallite phase dispersed in a feldspathic glass matrix, a maturing temperature of from about 750° to about 1050° C. and a coefficient of thermal expansion of from about 12×10-6 /°C. to about 17.5×10-6 /°C., said porcelain composition comprising: ______________________________________ Component Amount (wt. %) ______________________________________ SiO2 57-66 Al2 O3 7-15 K2 O 7-15 Na2 O 7-12 Li2 O 0.5-3 CaO 0-3 MgO 0-7 F 0-4 CeO2 0-1 ______________________________________wherein the leucite crystallites possess diameters not exceeding about 10 microns and represent from about 5 to about 65 weight percent of the two-phase porcelain composition. | |
