Lithium disilicate glass-ceramics

A dental product comprising a glass-ceramic consisting essentially of:

• about 62 to about 85% SiO2;
• about 1.5 to about 10% Al2O3;
• about 8 to about 19% Li2O;
• about 2.5 to about 7% K2O;
• about 0.5 to about 12 % P2O5;
• up to about 4.9% B2O3;
• up to about 1.5% F;
• up to about 5% ZnO;
• up to about 7% CaO;
• up to about 2% MgO;
• up to about 7% BaO;
• up to about 1% SrO;
• up to about 5% Cs2O;
• up to about 5% Na2O;
• up to about 2% TiO2;
• up to about 3% ZrO2;
• up to about 1% SnO2;
• up to about 1% Sb2O3;
• up to about 3% Y2O3;
• up to about 1% CeO2;
• up to about 1% Eu2O3;
• up to about 1% Tb2O7;
• up to about 2% Nb2O5;
• up to about 2% Ta2O5;
• wherein the molar ratio of(Na2O+K2O+CaO+SrO+BaO)/(Al2O3+ZnO)≧1.3;
• and
• wherein the 3-point flexure strength is greater than about 370 MPa.

A dental product comprising a glass-ceramic consisting essentially of:

• about 64 to about 70% SiO2;
• about 1.5 to about 6 Al2O3;
• about 10 to about 15% Li2O;
• about 2.5 to about 5% K2O;
• about 2 to about 7 % P2O5;
• up to about 1.5% F;
• up to about 7% BaO;
• up to about 1% SrO;
• up to about 5% Cs2O;
• up to about 2.7% B2O3;
• up to about 2% ZnO;
• up to about 0.9% CaO;
• up to about 2% MgO;
• up to about 3% Na2O;
• up to about 2% TiO2;
• up to about 3% ZrO2;
• up to about 1% SnO2;
• up to about 1% Sb2O3;
• up to about 3% Y2O3;
• up to about 1% CeO2;
• up to about 1% Eu2O3;
• up to about 1% Tb4O7;
• up to about 2% Nb2O5;
• and
• up to about 2% Ta2O5;
• and
• wherein the 3-point flexure strength is greater than about 370 MPa.

A dental product comprising a glass-ceramic consisting essentially of:

• about 62 to about 85% SiO2;
• about 5.1 to about 10Al2O3;
• about 8 to about 19% Li2O;
• about 0.5 to about 12 % P2O5.
• up to about 7% K2O;
• up to about 1.5% F;
• up to about 7% BaO;
• up to about 1% SrO;
• up to about 5% Cs2O;
• up to about 4.9% B2O3;
• up to about 5% ZnO;
• up to about 7% CaO;
• up to about 2% MgO;
• up to about 5% Na2O;
• up to about 2% TiO2;
• up to about 3% ZrO2;
• up to about 1% SnO2;
• up to about 1% Sb2O3;
• up to about 3% Y2O3;
• up to about 1% CeO2;
• up to about 1% Eu2O3;
• up to about 1% Tb4O7;
• up to about 2% Nb2O5;
• and
• up to about 2% Ta2O5;
• and
• wherein the 3-point flexure strength is greater than about 370 MPa.

A dental product comprising a glass-ceramic consisting essentially of:

• about 64 to about 70% SiO2;
• about 5.2 to about 9 Al2O3;
• about 10 to about 15% Li2O;
• about 2 to about 7 % P2O5;
• up to about 1.5% F;
• up to about 7% BaO;
• up to about 1% SrO;
• up to about 5% Cs2O;
• up to about 5% K2O;
• up to about 2.7% B2O3;
• up to about 2% ZnO;
• up to about 0.9% CaO;
• up to about 2% MgO;
• up to about 3% Na2O;
• up to about 2% TiO2;
• up to about 3% ZrO2;
• up to about 1% SnO2;
• up to about 1% Sb2O3;
• up to about 3% Y2O3;
• up to about 1% CeO2;
• up to about 1% Eu2O3;
• up to about 1% Tb4O7;
• up to about 2% Nb2O5;
• and
• up to about 2% Ta2O5;
• and
• wherein the 3-point flexure strength is greater than about 370 MPa.

A dental product comprising a glass-ceramic consisting essentially of:

• about 64 to about 70% SiO2;
• about 1.5 to about 6 Al2O3;
• about 10 to about 15% Li2O;
• about 2 to about 7 % P2O5;
• about 2.2 to about 5% K2O;
• about 0.5 to about 3% Na2O;
• about 0.5 to about 3% B2O3;
• up to about 1.5% F;
• up to about 7% BaO;
• up to about 1% SrO;
• up to about 5% Cs2O;
• up to about 0.9% CaO;
• up to about 2% TiO2;
• up to about 3% ZrO2;
• up to about 1% SnO2;
• up to about 1% Sb2O3;
• up to about 3% Y2O3;
• up to about 1% CeO2;
• up to about 1% Eu2O3;
• up to about 1% Tb4O7,
• up to about 2% Nb2O5;
• and
• up to about 2% Ta2O5;
• and
• wherein the 3-point flexure strength is greater than about 370 MPa.

A dental product comprising a glass-ceramic consisting of:

• about 62 to about 76% SiO2;
• about 1.5 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• about .3 to about 7% P2O5;
• about .5 to about 8% Ta2O5 ;
• up to about 5% B2O3.
• up to about 5% Na2O;
• up to about 7% K2O;
• up to about 1.5% F;
• up to about 5% ZnO;
• up to about 2% MgO;
• up to about 7% BaO;
• up to about 1% SrO;
• up to about 5% Cs2O;
• up to about 7% CaO;
• up to about 2% TiQ2;
• up to about 3% ZrO2;
• up to about 1% SnO2;
• up to about 1% Sb2O3;
• up to about 3% Y2O3;
• up to about 1% CeO2;
• up to about 1% Eu2O3;
• up to about 1% Tb4O7;
• and
• up to about 2% Nb2O5;
• and
• wherein the 3-point flexure strength is greater than about 370 MPa.