Ceramic material for veneering metallic dental protheses
AssigneeDucera Dental-Gesellschaft mbH
InventorsOttmar Komma, Juergen Steidl
Life of this patent
Estimating the term…
Abstract
Ceramic masses with processing temperatures of approximately 770.degree. C. and coefficients of thermal expansion of 8-9.multidot.10.sup.-6 K.sup.-1 and 16-17.5.multidot.10.sup.-6 K.sup.-1 are required for dental prostheses consisting of low-melting gold alloys and titanium alloys for their veneering. Such ceramic masses are composed of 60 to 75% by weight SiO.sub.2, 4 to 15% by weight Al.sub.2 O.sub.3, 0.7 to 2.5% by weight B.sub.2 O.sub.3, 0 to 0.9% by weight Sb.sub.2 O.sub.3, 0 to 0.5% by weight CeO.sub.2, 0 to 2.5% by weight BaO, 0 to 0.5% by weight CaO, 7 to 12% by weight K.sub.2 O, 6 to 11% by weight Na.sub.2 O, 0.55 to 1.4% by weight Li.sub.2 O and 0.2 to 1.0% by weight F.sub.2.
Claims12
A method of using a ceramic material to make a veneer on a gold alloy dental prostheses comprising depositing a ceramic material on said gold alloy dental prostheses and firing at a sufficiently high temperature and for a sufficient period of time to form said veneer, said ceramic material having a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 16.multidot.10.sup.-6 to 17.5.multidot.10.sup.-6 K.sup.-1 and comprising 60 to 68% by weight SiO.sub.2, 10 to 15% by weight Al.sub.2 O.sub.3, 0.7 to 1.5% by weight B.sub.2 O.sub.3, 0 to 0.5% by weight Sb.sub.2 O.sub.3, 0 to 0.5% by weight CeO.sub.2, 0 to 0.5% by weight BaO, 0.1 to 0.5% by weight CaO, 9 to 12% by weight K.sub.2 O, 9 to 11% by weight Na.sub.2 O, 0.8 to 1.4% by weight Li.sub.2 O and 0.2 to 0.4% by weight F.sub.2 and wherein said gold alloy dental prothesis comprises a gold alloy having a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 16.multidot.10.sup.-6 to 17.5.multidot. 10.sup.-6 K.sup.-1.
A method of using a ceramic material to make a veneer on a titanium or titanium alloy dental prostheses comprising depositing a ceramic material on said titanium or titanium alloy dental prostheses and firing at a sufficiently high temperature and for a sufficient period of time to form said veneer, said ceramic material having a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 8.multidot.10.sup.-6 to 17.5.multidot.10.sup.-6 K.sup.-1 and comprising 68 to 75% by weight SiO.sub.2, 4 to 8% by weight Al.sub.2 O.sub.3, 2 to 2.5% by weight B.sub.2 O.sub.3, 0.3 to 0.9% by weight Sb.sub.2 O.sub.3, 0 to 0.2% by weight CeO.sub.2, 0.5 to 2.5% by weight BaO, 0 to 0.3% by weight CaO, 7 to 11% by weight K.sub.2 O, 6 to 10% by weight Na.sub.2 O, 0.55 to 0.75% by weight Li.sub.2 O and 0.8 to 1.0% by weight F.sub.2.
A veneered dental prothesis comprising a ceramic material veneer and a dental prothesis, wherein said dental prothesis comprises a gold alloy having a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 16.multidot.10.sup.-6 to 17.5.multidot.10.sup.-6 K.sup.-1 and said ceramic material veneer has a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 16.multidot.10.sup.-6 to 17.5.multidot.10.sup.-6 K.sup.-1 and comprises 60 to 68% by weight SiO.sub.2 10 to 15% by weight Al.sub.2 O.sub.3, 0.7 to 1.5% by weight B.sub.2 O.sub.3, 0 to 0.5% by weight Sb.sub.2 O.sub.3, 0 to 0.5% by weight CeO.sub.2, 0 to 0.5% by weight BaO, 0.1 to 0.5% by weight CaO, 9 to 12% by weight Li.sub.2 O and 0.2 to 0.4% by weight F.sub.2.
A veneered dental prothesis comprising a ceramic material veneer and a dental prothesis, wherein said dental prothesis comprises titanium or a titanium alloy having a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 9.multidot. 10.sup.-6 to 10.multidot.10.sup.-6 K.sup.-1 and said ceramic material veneer has a coefficient of thermal expansion between 20.degree. and 500.degree. C. of 8.multidot.10.sup.-6 to 9.multidot.10.sup.-6 K.sup.-1 and comprises 68 to 75% by weight SiO.sub.2, 4 to 8% by weight Al.sub.2 O.sub.3, 2 to 2.5% by weight B.sub.2 O.sub.3, 0.3 to 0.9% by weight Sb.sub.2 O.sub.3, 0 to 0.2% by weight CeO.sub.2, 1.5 to 2.5% by weight BaO, 0 to 0.3% by weight CaO, 7 to 11% by weight K.sub.2 O, 6 to 10% by weight Na.sub.2 O, 0.55 to 0.75% by weight Li.sub.2 O and 0.8 to 1.0% by weight F.sub.2.
Dependencies are inferred from the claim text.