Pressable lithium disilicate glass ceramics

A glass-ceramic composition consisting essentially of in weight percent:

• 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 0.9% CaO;
• 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.

A glass-ceramic composition comprising in weight percent:

• 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;
• and
• about 0.5 to about 3% B2O3.

A glass-ceramic composition comprising in weight percent:

• about 62 to about 76% SiO2;
• about 1.5 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• about 0.3 to about 7% P2O5;
• and
• about 0.5 to about 8% Ta2O5.

A glass-ceramic composition comprising:

• about 62 to about 76% SiO2;
• about 1.5 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• about 0.3 to about 7% P2O5;
• about 0.5 to about 8% Ta2O5:
• and
• whereby the glass-ceramic is pressable.

A glass-ceramic composition comprising in weight percent:

• about 62 to about 76% SiO2;
• about 1.5 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• about 0.3 to about 7% P2O5;
• about 0.5 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% 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;
• and
• up to about 2% Nb2O5.

A glass-ceramic composition comprising in weight percent:

• about 68.8% SiO2;
• about 1.3% B2O3;
• about 4.8% Al2O3;
• about 1.0% CaO;
• about 2.8% BaO;
• about 14.4% Li2O;
• about 2.2% K2O;
• about 1.5% Na2O;
• and
• about 3.3% P2O5.

A glass-ceramic composition comprising in weight percent:

• about 67.2% SiO2;
• about 1.2% B2O3;
• about 4.7% Al2O3;
• about 1.0% CaO;
• about 2.7% BaO;
• about 14.1% Li2O;
• about 2.2% K2O;
• about 1.4% Na2O;
• about 3.2% P2O5;
• about 0.4% CeO2;
• and
• about 2% Ta2O5.

A method of making a lithium disilicate dental restoration comprising:

• melting a starting glass composition at temperatures within the range of about 1200 to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A method of making a lithium disilicate dental product comprising:

• melting a starting glass composition at temperatures within the range of about 1200 to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• and
• sintering the blank.

A method of making a lithium disilicate dental product comprising:

• melting a starting glass at temperatures within the range of about 1200 to about 1600° C.;
• quenching the glass;
• cooling the quenched glass to the crystallization temperature to form a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• and
• sintering the blank.

A method of making a lithium disilicate dental restoration comprising:

• melting a starting glass composition comprising in weight percent 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;
• and
• about 2 to about 7% P2O5;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A method of making a lithium disilicate dental restoration comprising:

• melting a starting glass composition comprising in weight percent about 62 to about 85% SiO2;
• about 5.1 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• and
• about 0.5 to about 12% P2O5;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A method of making a lithium disilicate dental restoration comprising:

• melting a starting glass composition comprising in weight percent about 64 to about 70% SiO2;
• about 5.2 to about 9 Al2O3;
• about 10 to about 15% Li2O;
• and
• about 2 to about 7% P2O5;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A method of making a lithium disilicate dental restoration comprising:

• melting a starting glass composition comprising in weight percent
• 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;
• and
• about 0.5 to about 3% B2O3;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A method of making a dental restoration comprising:

• melting a starting glass composition comprising in weight percent about 68.8% SiO2;
• about 1.3%B2O3;
• about 4.8% Al2O3;
• about 1.0% CaO;
• about 2.8% BaO;
• about 14.4% Li2O;
• about 2.2% K2O;
• about 1.5% Na2O;
• and
• about 3.3% P2O5;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A method of making a dental restoration comprising:

• melting a starting glass composition comprising in weight percent about 68.8% SiO2;
• about 1.3% B2O3;
• about 4.8% Al2O3;
• about 1.0% CaO;
• about 2.8% BaO;
• about 14.4% Li2O;
• about 2.2% K2O;
• about 1.5% Na2O;
• and
• about 3.3% P2O5;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400 to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.

A dental restoration 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 7% CaO;
• 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% Tb4O7;
• up to about 2% Nb2O5;
• and
• up to about 2% Ta2O5.

A dental restoration comprising the glass-ceramic composition comprising:

• about 64 to about 70% SiO2;
• about 5.2 to about 9 Al2O3;
• about 10 to about 15% Li2O;
• and
• about 2 to about 7% P2O5.

A dental restoration comprising the glass-ceramic comprising:

• about 62 to about 76% SiO2;
• about 1.5 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• about 0.3 to about 7% P2O5;
• and
• about 0.5 to about 8% Ta2O5.

A method of making a dental restoration comprising:

• melting a starting glass composition comprising in weight percent about 62 to about 76% SiO2;
• about 1.5 to about 10 Al2O3;
• about 8 to about 19% Li2O;
• about 0.3 to about 7% P2O5;
• and
• about 0.5 to about 8% Ta2O5;
• at temperatures within the range of about 1200° to about 1600° C.;
• quenching the glass melt;
• subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400° to about 1100° C. to convert the glass into a glass-ceramic;
• comminuting the glass ceramic to a powder;
• compacting the powder to a starting blank;
• sintering the blank;
• and
• pressing the blank into the dental restoration.