Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
Volume 67A, Issue 3, Pages 952-959Publisher
WILEY-LISS
DOI: 10.1002/jbm.a.10131
Keywords
bonding strength; composite; glass-ceramic apatite-wollastonite; polyethylene; volume fraction
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Bioactive glass-ceramic apatite-wollastonite (A-W) has been incorporated into polyethylene in particulate form to create new bioactive composites for potential maxillofacial applications. The effects of varying the volume fraction of glass-ceramic A-W filler and the glass-ceramic A-W particle size were investigated by measuring the bonding strength of the bonelike apatite layer formed on the surface of glass-ceramic A-W-polyethylene composites. The bonding strength was evaluated via a modified ASTM C-333 standard in which a tensile stress was applied to the substrate and the strength of the bioactive layer was compared with that formed on commercially available hydroxyapatite-polyethylene composite samples, HAPEX(TM). The composites demonstrated greater bonding strength with in-creased filler content and reduced filler particle size (maximum 6.9 +/- 0.5 MPa) and a marginally greater bonding strength as compared with HAPEX(TM) (2.8 +/- 0.5 MPa), when glass-ceramic A-W-polyethylene composite samples with the same filler content were tested. The higher bonding strength of the apatite layer formed on the A-W-polyethylene composite samples suggests that, in addition to maxillofacial applications, these composites might also be utilized in applications involving higher levels of load bearing. (C) 2003 Wiley Periodicals, Inc.
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