Patent ID: 8110035

Claim:
A kit for making a dental prosthesis, comprising: a) an opaque composition comprising: Components Concentration Range (Wt. %) SiO 2 42-46% Al 2 O 3 8-12% Na 2 O 2-5% K 2 O 6-9% Li 2 O 0-2% CaO 0-2% MgO 0-2% ZrO 2 20-30% SnO 2 1-4% Tb 4 O 7 0-2% CeO 2 0-3% TiO 2 0-2% Sb 2 O 3 0-0.1% Fluorescing agent 0-5% b) an ingot porcelain composition comprising: Oxide Concentration Range (Wt. %) SiO 2 63-66% Al 2 O 3 10-14% Na 2 O 3-7% K 2 O 9-12% Li 2 O 0-2% CaO 1-4% BaO 0-3% Tb 4 O 7 0-2% CeO 2 0-2%; and c) a veneering porcelain composition comprising: Oxide Concentration Range (Wt. %) SiO 2 62-65% Al 2 O 3 8-11% Na 2 O 8-11% K 2 O 4-7% Li 2 O 0-2% CaO 2-5% BaO 0-3% MgO 1-4% SnO 2 0-2% Tb 4 O 7 0-2% CeO 2 0-2% Sb 2 O 3 0-2% P 2 O 5 0-0.1% TiO 2 0-0.1% F 0-1%.