LIQUID-PHASE SINTERING OF HYDROXYAPATITE BY PHOSPHATE AND SILICATE GLASS ADDITIONS - STRUCTURE AND PROPERTIES OF THE COMPOSITES

• Type: Article in International Scientific Journal
• Date: 1995

Authors

SANTOS, JD (Author) FEUP; REIS, RL (Author) FEUP; MONTEIRO, FJ (Author) FEUP; KNOWLES, JC (Author) Other; HASTINGS, GW (Author) Other

Journal

Title: Journal of Materials Science: Materials in Medicine

Vol. 6 No. 6

Pages: 348-352

ISSN: 0957-4530

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 56 Citations

Scopus - 66 Citations

Scientific classification

FOS: Engineering and technology > Environmental biotechnology

CORDIS: Technological sciences > Engineering > Biomaterial engineering

Other information

Authenticus ID: P-001-GTV

DOI: 10.1007/bf00120303

Abstract (EN): 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(R) 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 with in the 1.1-1.2 MPa mPam(1/2) range, which is double that determined for sintered hydroxyapatite. A 2 mu m 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5