title: Surface modification of biodegradable porous Mg bone scaffold using polycaprolactone/bioactive glass composite.
abstract: A reduction in the degradation rate of magnesium (Mg) and its alloys is in high demand to enable these materials to be used in orthopedic applications. For this purpose, in this paper, a biocompatible polymeric layer reinforced with a bioactive ceramic made of polycaprolactone (PCL) and bioactive glass (BG) was applied on the surface of Mg scaffolds using dip-coating technique under low vacuum. The results indicated that the PCL-BG coated Mg scaffolds exhibited noticeably enhanced bioactivity compared to the uncoated scaffold. Moreover, the mechanical integrity of the Mg scaffolds was improved using the PCL-BG coating on the surface. The stable barrier property of the coatings effectively delayed the degradation activity of Mg scaffold substrates. Moreover, the coatings induced the formation of apatite layer on their surface after immersion in the SBF, which can enhance the biological bone in-growth and block the microcracks and pore channels in the coatings, thus prolonging their protective effect. Furthermore, it was shown that a three times increase in the concentration of PCL-BG noticeably improved the characteristics of scaffolds including their degradation resistance and mechanical stability. Since bioactivity, degradation resistance and mechanical integrity of a bone substitute are the key factors for repairing and healing fractured bones, we suggest that PCL-BG is a suitable coating material for surface modification of Mg scaffolds.
authors: School of Materials Science and Engineering, Helmerich Advanced Technology Research Center, Oklahoma State University, Tulsa, OK 74106, USA.
authors: Mostafa
authors: M
authors: Yazdimamaghani
authors: School of Materials Science and Engineering, Helmerich Advanced Technology Research Center, Oklahoma State University, Tulsa, OK 74106, USA.
authors: Mehdi
authors: M
authors: Razavi
authors: Electrical & Computer Engineering Department, North Carolina State University, Raleigh, NC 27606, USA.
authors: Daryoosh
authors: D
authors: Vashaee
authors: School of Materials Science and Engineering, Helmerich Advanced Technology Research Center, Oklahoma State University, Tulsa, OK 74106, USA; Department of Developmental Sciences, Marquette University School of Dentistry, Milwaukee, WI 53201, USA. Electronic address: lobat.tayebi@marquette.edu.
authors: Lobat
authors: L
authors: Tayebi
mesh_terms: D001672:Biocompatible Materials; D005898:Glass; D008274:Magnesium / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D011091:Polyesters / Q000378:metabolism*; D013499:Surface Properties; D054457:Tissue Scaffolds
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; C016240:polycaprolactone; D008274:Magnesium
keywords: Biomaterials; Coating; Magnesium; Scaffold