INJECTABLE CEMENT COMPOSITION FOR ORTHOPAEDIC AND DENTAL USE
First Claim
1. A method of preparing a hydraulic ceramic precursor powder based on calcium aluminate and/or calcium silicate and zirconium and/or an inert filler material for orthopaedic and dental use, which powder comprises:
- 55-65 wt-% of calcium aluminate;
35-45 wt-% of zirconium oxide and/or an inert filler material, and;
0.5-5 wt-% of micro-silica;
wherein said components are based on the total amount of the precursor powder, calcium aluminate is constituted by more than 70 atomic % of CaOAl2O3 and less than 30 atomic % of one or more of the phases (CaO)12(Al2O3)7, (CaO)3Al2O3, CaO(Al2O3)2, CaO(Al2O3)6, and CaO—
Al2O3 glass phase, and wherein the precursor powder is kept at a relative humidity of below 60% during manufacturing and packaging thereof.
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Abstract
The present invention relates to ceramic precursor powder compositions and chemically bonded ceramic (CBC) materials, Ca-aluminate and/or calcium silicate, and a composite biomaterial with prolonged shelf time of the precursor, suitable for orthopaedic applications with improved injectability. The present invention also relates to a method of manufacturing said cured material, bioelements, implants, or drug delivery carrier materials made by said cured material, a kit comprising the ceramic precursor powder and hydration liquid, as well as the use of said ceramic precursor powder and hydration liquid, or said cured material, for orthopaedic and dental applications.
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Citations
19 Claims
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1. A method of preparing a hydraulic ceramic precursor powder based on calcium aluminate and/or calcium silicate and zirconium and/or an inert filler material for orthopaedic and dental use, which powder comprises:
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55-65 wt-% of calcium aluminate; 35-45 wt-% of zirconium oxide and/or an inert filler material, and; 0.5-5 wt-% of micro-silica; wherein said components are based on the total amount of the precursor powder, calcium aluminate is constituted by more than 70 atomic % of CaOAl2O3 and less than 30 atomic % of one or more of the phases (CaO)12(Al2O3)7, (CaO)3Al2O3, CaO(Al2O3)2, CaO(Al2O3)6, and CaO—
Al2O3 glass phase, and wherein the precursor powder is kept at a relative humidity of below 60% during manufacturing and packaging thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 19)
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12. A method of establishing the workability of a hydraulic ceramic precursor powder based on calcium aluminate and/or calcium silicate and zirconium and/or an inert filler material for orthopaedic and dental use, wherein the water content of the powder is measured as the loss on ignition, and thereafter, the value obtained is compared to a maximum allowable value of 0.08% of water measured as the loss on ignition.
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17. A kit for manufacturing a chemically bonded ceramic material, comprising a container containing:
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a hydraulic ceramic precursor powder based on calcium aluminate and/or calcium silicate and zirconium and/or an inert filler material for orthopaedic and dental use, which powder comprises; 55-65 wt-% of calcium aluminate; 35-45 wt-% of zirconium oxide and/or an inert filler material, and; 0.5-5 wt-% of micro-silica; wherein said components are based on the total amount of the precursor powder, calcium aluminate is constituted by more than 70 atomic % of CaOAl2O3 and less than 30 atomic % of one or more of the phases (CaO)12(Al2O3)7, (CaO)3Al2O3, CaO(Al2O3)2, CaO(Al2O3)6, and CaO—
Al2O3 glass phase, having a water content below 0.08 weight-% measured as loss on ignition; anda hydration liquid comprising; 90-95 wt-% of water; 3-5 wt-% of a compound based on polycarboxylic acid, and having a molecular weight of 10,000-50,000; 1-5 wt-% of methyl cellulose, and; less than 0.2 wt-% of LiCl; wherein said amounts are based on the total weight of the hydration liquid, wherein the hydration liquid and the powder are stored separately, and the part of the container that holds the precursor powder exhibits a relative humidity (RH) of below 60%. - View Dependent Claims (18)
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Specification