title: Bioactive and bioresorbable cellular cubic-composite scaffolds for use in bone reconstruction.
abstract: We used a novel composite fibre-precipitation method to create bioactive and bioresorbable cellular cubic composites containing calcium phosphate (CaP) particles (unsintered and uncalcined hydroxyapatite (u-HA), alpha-tricalcium phosphate, beta-tricalcium phosphate, tetracalcium phosphate, dicalcium phosphate dihydrate, dicalcium phosphate anhydrate or octacalcium phosphate) in a poly-D/L-lactide matrix. The CaP particles occupied greater than or equal to 70 wt% (greater than or equal to 50 vol%) fractions within the composites. The porosities of the cellular cubic composites were greater than or equal to 70% and interconnective pores accounted for greater than or equal to 70% of these values. In vitro changes in the cellular geometries and physical properties of the composites were evaluated over time. The Alamar Blue assay was used to measure osteoblast proliferation, while the alkaline phosphatase assay was used to measure osteoblast differentiation. Cellular cubic C-u-HA70, which contained 70 wt% u-HA particles in a 30 wt% poly-D/L-lactide matrix, showed the greatest three-dimensional cell affinity among the materials tested. This composite had similar compressive strength and cellular geometry to cancellous bone, could be modified intraoperatively (by trimming or heating) and was able to form cortico-cancellous bone-like hybrids. The osteoinductivity of C-u-HA70, independent of biological growth factors, was confirmed by implantation into the back muscles of beagles. Our results demonstrated that C-u-HA70 has the potential as a cell scaffold or temporary hard-tissue substitute for clinical use in bone reconstruction.
authors.affiliation: Medical Division, Takiron Co., Ltd, 2-3-13, Azuchi-machi, Chuo-ku, Osaka 541-0052, Japan. sikinami@takiron.co.jp
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Shikinami
authors.forename: Kenshi
authors.initials: K
authors.lastname: Okazaki
authors.forename: Makoto
authors.initials: M
authors.lastname: Saito
authors.forename: Masaki
authors.initials: M
authors.lastname: Okuno
authors.forename: Shin
authors.initials: S
authors.lastname: Hasegawa
authors.forename: Jiro
authors.initials: J
authors.lastname: Tamura
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Fujibayashi
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D001861:Bone Regeneration / Q000502:physiology*; D018786:Bone Substitutes / Q000737:chemistry / Q000378:metabolism; D049109:Cell Proliferation; D002478:Cells, Cultured; D004285:Dogs; D006801:Humans; D018482:Muscle, Skeletal; D010006:Osteoblasts / Q000378:metabolism; D010012:Osteogenesis / Q000502:physiology
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes