title: Bonding strength of the apatite layer formed on glass-ceramic apatite-wollastonite-polyethylene composites.
abstract: 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. The composites demonstrated greater bonding strength with increased filler content and reduced filler particle size (maximum 6.9 +/- 0.5 MPa) and a marginally greater bonding strength as compared with HAPEX (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.
authors: Department of Materials Science and Metallurgy, University of Cambridge, New Museums Site, Pembroke Street, Cambridge, CB2 3QZ, England. jaj33@cam.ac.uk
authors: J A
authors: JA
authors: Juhasz
authors: S M
authors: SM
authors: Best
authors: M
authors: M
authors: Kawashita
authors: N
authors: N
authors: Miyata
authors: T
authors: T
authors: Kokubo
authors: T
authors: T
authors: Nakamura
authors: W
authors: W
authors: Bonfield
mesh_terms: D000268:Adhesiveness; D001696:Biomechanical Phenomena; D018786:Bone Substitutes / Q000737:chemistry*; D017610:Calcium Compounds; D002516:Ceramics; D003188:Composite Resins / Q000138:chemical synthesis*; D005898:Glass; D008422:Materials Testing; D010316:Particle Size; D020959:Polyethylene; D017640:Silicates
chemical_list: D018786:Bone Substitutes; D017610:Calcium Compounds; D003188:Composite Resins; D017640:Silicates; D020959:Polyethylene; C031293:calcium silicate