Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
2006-03-27
2009-08-18
Koslow, C. Melissa (Department: 1793)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
C106S035000, C106S717000, C106S735000, C106S737000, C623S023620, C424S602000
Reexamination Certificate
active
07575628
ABSTRACT:
A hydraulic cement comprising a calcium silicate and at least one phosphate compound. The phosphate compound is included in an amount sufficient to react a major portion of the calcium hydroxide that is produced during hydration of the cement to hydroxyapatite or other calcium phosphates. The phosphate compound is preferably a mono-calcium phosphate. The cement is useful in both bio-medical/dental and engineering applications. The calcium hydroxide is reacted by the phosphate to form hydroxiapatite or other calcium phosphate that is co-precipitated with the calcium silicate hydrate to form a composite-like structure on a nano-scale level. The reduced calcium hydroxide content in the set cement increases its strength and reduces its pH. The hydroxiapatite content and the reduced pH render the cement bio-active and suitable for use in medical and dental implants, for example, for replacement bone and tooth material. Due to its high strength, the cement may also be used for structural/engineering applications.
REFERENCES:
patent: 3409452 (1968-11-01), Angstadt et al.
patent: 3510322 (1970-05-01), Kuneo et al.
patent: 5415547 (1995-05-01), Torabinejad et al.
patent: 5769638 (1998-06-01), Torabinejad et al.
patent: 6518212 (2003-02-01), Wagh et al.
patent: 6730324 (2004-05-01), Troczynski et al.
patent: 7083672 (2006-08-01), Wagh et al.
patent: 2003/0159618 (2003-08-01), Primus
patent: 2006/0078590 (2006-04-01), Hermansson et al.
patent: WO02056838 (2002-07-01), None
Steinke et al., Development of chemically bonded ceramincs in the CaO—SiO2—P2O5—H2O system. Materials Research Laboratory. Online Feb. 12, 2003 abstract only.
Vaidya et al., Pressure-induced crystalline to amorphous transition in hydroxylapatite. J. of Materials Science 32, 3213-3217 (1997).
Persson, Bertil, Seven-year study on the effect of silica fume in concrete. Elsevier Science Ltd., 1998.
Mitchell et al., Osteoblast biocompatibility of mineral trioxide aggregate, Biomaterials 20, 167-173 (1999).
Hamanishi et al., Self-setting, bioactive, and biodegradable TTCP-DCPD apatite cement. J. of Biomedical Materials Research, 32, 383-389 (1996).
Diarra et al., Elaboration and evaluation of an intraoral controlled release delivering system. Biomaterials, 19, 1523-1527 (1998).
Oonishi et al., Particulate bioglass compared with hydroxyapatite as a bone graft substitute (Research) 1996.
Lu Donghui
Zhou Shuxin
Hathaway Todd N.
Innovative BioCeramix, Inc.
Koslow C. Melissa
LandOfFree
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