Patent ID: 7575628

Claim:
A bio-active hydraulic cement composition for medical and dental applications that reacts with water at a substantially neutral PH, said hydraulic cement composition comprising: at least one phosphate compound in an amount sufficient to react a major portion of calcium hydroxide produced during hydration of said cement to form hyroxyapatite or other calcium phosphates, said at least one phosphate compound being present in an amount within the range from more than 5% to about 30% by weight of said cement composition and being selected from the group consisting of: calcium phosphates; magnesium phosphates; sodium phosphates; zinc phosphates; aluminum phosphates; iron phosphates; potassium phosphates; nickel phosphates; zirconium phosphates; phosphloric acid, organo-metallic phosphates; and mixtures thereof; and at least one calcium silicate compound said calcium silicate compound being selected from the group consisting of: di-calcium silicate; tri-calcium silicate; tetra-calcium silicate; and mixtures thereof.