title: Mechanical properties and in vitro evaluation of bioactivity and degradation of dexamethasone-releasing poly-D-L-lactide/nano-hydroxyapatite composite scaffolds.
abstract: The purpose of this study was to fabricate drug-release nano-composite scaffolds and perform in vitro evaluation of their mechanical properties, bioactivity, biodegradability and drug release behaviors. Porous drug-release poly-d-l-lactide (PDLLA) composite scaffolds filled with different amounts of nano-hydroxyapatite (nano-HAp) were prepared by a technique combining polymer coagulation, cold compression moulding, salt leaching and drug coating. Apatite detected on the scaffolds after exposure to a simulated body fluid showed improvement in bioactivity and the apatite formation ability through the addition of the nano-HAp content in the composites. Nano-HAp incorporation and apatite formation made a positive impact on the mechanical properties of the scaffolds; however, plasticization and degradation of PDLLA had a negative impact. The pH-compensation effect of the composite scaffolds can reduce the risk of chronic inflammation complications. The fabrication method in this study can produce scaffolds with controllable structure, appropriate mechanical properties and degradation rates for cancellous bone repair applications.
authors: Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
authors: Ling
authors: L
authors: Chen
authors: Chak Yin
authors: CY
authors: Tang
authors: Chi Pong
authors: CP
authors: Tsui
authors: Da Zhu
authors: DZ
authors: Chen
mesh_terms: D040761:Biomimetic Materials / Q000378:metabolism; D001826:Body Fluids / Q000378:metabolism; D003907:Dexamethasone / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008422:Materials Testing; D055595:Mechanical Phenomena; D008970:Molecular Weight; D053761:Nanocomposites / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D023822:Tissue Engineering; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D011091:Polyesters; C033616:poly(lactide); D003907:Dexamethasone; D017886:Durapatite