Dental restorative cement pastes

Claim 2

A .[.dental restorative.]. paste .Iadd.consisting essentially of .Iaddend..[.comprising.]. an aqueous mixture of Ca 4 (PO 4 )O and at least one other calcium phosphate selected from the group consisting of CaHPO 4 .2H 2 O .[.,.]. .Iadd.and .Iaddend.CaHPO 4 , .[.Ca 8 H 2 (PO 4 ) 6 .5H 2 O, β-Ca 3 (PO 4 ) 2 , β-Ca 3 (PO 4 ) 2 , and modified Ca 3 (PO 4 ) 2 , the paste being capable of hardening.]. .Iadd.which aqueous mixture hardens .Iaddend.into a cement .Iadd.at an ambient temperature.

Claim 3

The paste of claim 1 wherein the other calcium phosphate is CaHPO 4 .2H 2 O.

Claim 4

The paste of claim 1 wherein the other calcium phosphate is CaHPO 4 . .[.4. The paste of claim 1 wherein the other calcium phosphate is Ca 8 H 2 (PO 4 ) 6 .5H 2 O..]. .[.5. The paste of claim 1 wherein

Claim 5

the other calcium phosphate is β-Ca 3 (PO 4 ) 2 ..]. 6. The paste of claim 1 wherein both calcium phosphates are in crystalline,

Claim 6

cryptocrystalline, or amorphous form. 7. The paste of claim 1 further .[.comprising.]. .Iadd.including .Iaddend.up to approximately 10% by weight of additional calcium or phosphate containing compounds .Iadd.in an

Claim 7

amount sufficient to alter the pH of the paste.Iaddend.. 8. The paste of claim 7 wherein the additional calcium containing compounds .[.comprise.]. .Iadd.are selected from the group consisting of .Iaddend.CaCl 2

Claim 8

.[.or.]. .Iadd.and .Iaddend.Ca(C 2 H 3 O 2 ) 2 . 9. The paste of claim 7 wherein the additional phosphate containing compounds .[.comprise.]. .Iadd.are selected from the group consisting of .Iaddend.NaH 2 PO 4 .[.or.]. .Iadd.and .Iaddend.(NH 4 )H 2

Claim 9

PO 4 . 10. The paste of claim 1 further .[.comprising.]. .Iadd.including .Iaddend.fluoride containing compounds such that the fluoride content of the paste is up to approximately 3.8% by weight .Iadd.in an amount sufficient to increase the rate of precipitation of

Claim 10

hydroxyapatite from the paste.Iaddend.. 11. The paste of claim 10 wherein the fluoride containing compounds .[.comprise.]. .Iadd.are selected from the group consisting of .Iaddend.CaF 2 , SrF 2 , NaF, Na 2

Claim 11

SiF 6 .[.or.]. .Iadd.and .Iaddend.NaPO 3 F. 12. A paste .[.comprising.]. .Iadd.consisting essentially of .Iaddend.CaHPO 4 and Ca 4 (PO 4 ) 2 O having a particle size of approximately 1 μm and a 20mM solution of H 3 PO 4 .Iadd., the paste hardening

Claim 12

SiF 6 .[.or.]. .Iadd.and .Iaddend.NaPO 3 F. 12. A paste .[.comprising.]. .Iadd.consisting essentially of .Iaddend.CaHPO 4 and Ca 4 (PO 4 ) 2 O having a particle size of approximately 1 μm and a 20mM solution of H 3 PO 4 .Iadd., the paste hardening

Claim 13

into a cement at an ambient temperature.Iaddend.. 13. The paste of claim 1 additionally .[.comprising.]. .Iadd.including .Iaddend.a seed crystal compound selected from the group consisting of hydroxyapatite and fluorapatite .Iadd.in an amount sufficient to reduce the setting time of the cement.Iaddend.. .Iadd.14. The paste of claim 13 wherein the seed crystal compound is hydroxyapatite, the hydroxyapatite being present in an amount up to 43% by weight and in an amount sufficient to reduce the setting time of the cement. .Iaddend. .Iadd.15. The paste of claim 1 additionally including up to approximately 5% by weight of a high molecular weight crystal growth inhibitor selected from the group consisting of proteoglycans, glycoproteins, polylysine and protamine in an amount sufficient to inhibit the growth of hydroxyapatite crystals. .Iaddend. .Iadd.16. The paste of claim 1 additionally including β-Ca 3 (PO 4 ) 2 in an amount sufficient to achieve setting expansion of the cement. .Iaddend. .Iadd.17. The paste of claim 1 additionally including up to 1% by weight of a crystal habit modifier selected from the group consisting of Mg 2+ , Sr 2+ , citrate, phosphonates, carbonate, polyphosphates, sucrose phosphate, and phosphocitrate in an amount sufficient to achieve setting expansion of the

Claim 14

cement. .Iaddend. .Iadd.18. The paste of claim 1 wherein the paste is slightly acidic. .Iaddend. .Iadd.19. The paste of claim 1 where in the

Claim 15

paste is slightly basic. .Iaddend. .Iadd.20. The paste of claim 1 additionally including granular sugar, the sugar being present in an amount up to 20% by weight and in an amount sufficient to form a porous cement upon removal of the sugar by application of hot water to the cement. .Iaddend.