Dental ceramic material with a relatively low processing temperature
AssigneesDegussa AG, Ducera Dental-Gesellschaft mbH
InventorsOttmar Komma, Juergen Steidl
Life of this patent
Estimating the term…
Abstract
A dental ceramic material is disclosed for the preparation and repair of metal ceramic and fully ceramic dentures, which has a processing temperature of 660.degree..+-.30.degree. C., and has the following composition: 60 to 65% by weight of SiO.sub.2, 8.5 to 11% by weight of Al.sub.2 O.sub.3, 8 to 12% by weight of K.sub.2 O, 10.5 to 12% by weight of Na.sub.2 O, 0.7 to 2% by weight of CaO, 0.5 to 2.5% by weight of B.sub.2 O.sub.3, 0.1 to 0.6% by weight of Sb.sub.2 O.sub.3, 0 to 0.5% by weight of CeO.sub.2, 1.0 to 3.8% by weight of TiO.sub.2, 0.8 to 1.4% by weight of Li.sub.2 O, and 0.6 to 2.4% by weight of F.sub.2.
Claims10
A dental ceramic material for the preparation and repair of metal ceramic and fully ceramic dentures, said material having a processing temperature below 700.degree. C. and a coefficient of thermal expansion .alpha. of 13-14.multidot.10.sup.-6 .multidot.K.sup.-1 between 25.degree. and 500.degree. C., said material comprising 60 to 65% by weight of SiO.sub.2, 8.5 to 11% by weight of Al.sub.2 O.sub.3, 8 to 12% by weight of K.sub.2 O, 10.5 to 12% by weight of Na.sub.2 O, 0.7 to 2% by weight of CaO, 0.5 to 2.5% by weight of B.sub.2 O.sub.3, 0.1 to 0.6% by weight of Sb.sub.2 O.sub.3, 0 to 0.5% by weight of CeO.sub.2, 1 to 3.8% by weight of TiO.sub.2, 0.8 to 1.4% by weight of Li.sub.2 O and 0.6 to 2.4% by weight of F.sub.2.
Dependencies are inferred from the claim text.