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Liquid phase sintering of hydroxyapatite by phosphate and silicate glass additions: structure and properties of the composites

โœ Scribed by J. D. Santos; R. L. Reis; F. J. Monteiro; J. C. Knowles; G. W. Hastings

Publisher
Springer
Year
1995
Tongue
English
Weight
476 KB
Volume
6
Category
Article
ISSN
0957-4530

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โœฆ Synopsis

Phosphate-and silicate-based glasses were added to hydroxyapatite in order to improve its mechanical properties and to fabricate composites with different degrees of bioactivity. A strong chemical bonding was obtained between hydroxyapatite and the phosphate-based glasses leading to samples approaching theoretical density, according to density measurements and scanning electron microscopy. Bioglass ยฎ additions led to the formation of a complex calcium phosphate silicate which hampered the reinforcement process. The fracture toughness of the hydroxyapatite-glass composites was shown to be within the 1.1-1.2 MPa m 1/z range, which is double that determined for sintered hydroxyapatite. A 2 gm thick apatite layer was observed on the surface of the hydroxyapatite-glass composites after 48 h immersion in a simulated human blood plasma, whereas only a few apatite crystals were detected on sintered hydroxyapatite after 7 days immersion. From the results obtained we anticipate that the composites might show a higher rate of bone bonding, leading to enhanced bioactivity.

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