Combinations of sparingly soluble calcium phosphates in slurries and pastes as mineralizers and cements
AssigneeAmerican Dental Association Health Foundation
InventorsWalter E. Brown, Laurence C. Chow
Life of this patent
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Abstract
Dental restorative compositions containing a mixture of Ca.sub.4 (PO.sub.4).sub.2 O and at least one different calcium phosphate.
Claims29
A dental restorative slurry comprising an aqueous mixture of Ca.sub.4 (PO.sub.4).sub.2 O and at least one other calcium phosphate selected from the group consisting of CaHPO.sub.4.2H.sub.2 O, CaHPO.sub.4, Ca.sub.8 H.sub.2 (PO.sub.4).sub.6. 5H.sub.2 O, .alpha.--Ca.sub.3 (PO.sub.4).sub.2, .beta.--Ca.sub.3 (PO.sub.4).sub.2, and modified Ca.sub.3 (PO.sub.4).sub.2, both calcium phosphates being present in the slurry in excess such that hydroxyapatite is substantially continuously precipitated from the slurry.
A dental restorative paste comprising a nonaqueous mixture of a nontoxic organic solvent, Ca.sub.4 (PO.sub.4).sub.2 O and at least one other calcium phosphate selected from the group consisting of CaHPO.sub.4.2H.sub.2 O, CaHPO.sub.4, Ca.sub.8 H.sub.2 (PO.sub.4).sub.6.5H.sub.2 O, .alpha.--Ca.sub.3 (PO.sub.4).sub.2, .beta.--Ca.sub.3 (PO.sub.4).sub.2 and modified Ca.sub.3 (PO.sub.4).sub.2, the paste being capable of hardening into a cement upon contact with an aqueous medium.
A dental restorative powder comprising a mixture of Ca.sub.4 (PO.sub.4).sub.2 O and at least one other calcium phosphate selected from the group consisting of CaHPO.sub.4.2H.sub.2 O, CaHPO.sub.4, Ca.sub.8 H.sub.2 (PO.sub.4).sub.6. 5H.sub.2 O, .alpha.--Ca.sub.3 (PO.sub.4).sub.2, .beta.--Ca.sub.3 (PO.sub.4).sub.2, and modified Ca.sub.3 (PO.sub.4).sub.2, the powder being capable of forming a slurry upon contact with an appropriate aqueous solvent, the slurry being capable of substantially continuously precipitating hydroxyapatite.
A dental restorative powder comprising a mixture of Ca.sub.4 (PO.sub.4).sub.2 O and at least one other calcium phosphate selected from the group consisting of CaHPO.sub.4.2H.sub.2 O, CaHPO.sub.4, Ca.sub.8 H.sub.2 (PO.sub.4).sub.6.5H.sub.2 O, .alpha.--Ca.sub.3 (PO.sub.4).sub.2, .beta.--Ca.sub.3 (PO.sub.4).sub.2, and modified Ca.sub.3 (PO.sub.4).sub.2, the powder being capable of forming a hardenable cement upon contact with an appropriate aqueous solvent.
Dependencies are inferred from the claim text.