Collagen-hydroxyapatite composite prepared by biomimetic process.
A novel bone graft substitute comprising a porous, collagenous scaffold was biomimetically coated with hydroxyapatite using a simulated body fluid solution chemistry method. The scaffold had a porosity of approximately 85%, with pore sizes between 30 microm and 100 microm. Glutaraldehyde vapor was used to stabilize the collagenous scaffold, giving a significantly increased thermal stability over an unstabilized scaffold, as shown by differential scanning calorimetry. A thin layer (<10 microm) of crystalline hydroxyapatite was deposited onto the stabilized collagenous scaffold by soaking the collagenous construct in simulated body fluid in the presence of calcium silicate glass. The presence of crystalline hydroxyapatite was confirmed by X-ray diffraction, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. In vitro cytotoxicity testing of the composite construct using L-929 fibroblasts (ISO 10993-5) and rabbit periosteal cells revealed a cytocompatible material that supported cellular attachment and proliferation.
Lickorish
David
D
Bone Biomaterial Unit, School of Pathology, Faculty of Medical Sciences, University of New South Wales, Sydney 2052, Australia.
Ramshaw
John A M
JA
Werkmeister
Jerome A
JA
Glattauer
Veronica
V
Howlett
C Rolfe
CR
D000818:Animals; D001672:Biocompatible Materials; D001842:Bone and Bones; D017610:Calcium Compounds; D002417:Cattle; D002448:Cell Adhesion; D003094:Collagen / Q000648:ultrastructure; D017886:Durapatite; D008855:Microscopy, Electron, Scanning; D019736:Prostheses and Implants; D017640:Silicates; D014961:X-Ray Diffraction
D001672:Biocompatible Materials; D017610:Calcium Compounds; D017640:Silicates; D003094:Collagen; D017886:Durapatite; C031293:calcium silicate