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Porous hydroxyapatite (Ca10(PO4)6(OH)2; HA) coated with ƒÀ-tricalcium phosphate (Ca3(PO4)2; TCP) was prepared by our unique method. The porous HA was soaked in diammonium hydrogen phosphate solution, and then the HA was sintered at 900•Ž for 3 hrs. ƒÀ-TCP was formed on the surface of HA. It was possible to control the content of surface-formed ƒÀ-TCP arbitrary by varying the concentration of the solution. The obtained HA coated with 33wt% ƒÀ-TCP (33TCP) had about 60% open porosity with the pore size from 150 to 400 ƒÊm. The average compressive strength of 33TCP was 17.5 MPa. Surface coated HA with ƒÀTCP deprived of the brittleness in handling. From the results of implantation into the femoral condyles of adult rabbits, this porous material showed good bone formation inner and around itself.

SURFACE COATING OF &beta;-TRICALCIUM PHOSPHATE ON THE POROUS HYDROXYAPATITE

SURFACE COATING OF β-TRICALCIUM PHOSPHATE ON THE POROUS HYDROXYAPATITE