Non-crystalline composite tissue engineering scaffolds using boron-containing bioactive glass and poly(D,L-lactic acid) coatings

Biomed Mater. 2009 Oct;4(5):055002. doi: 10.1088/1748-6041/4/5/055002. Epub 2009 Sep 23.

Abstract

The aim of this study was the fabrication of three-dimensional, highly porous, bioactive scaffolds using a recently developed bioactive glass powder, denominated '0106', with nominal composition (in wt%): 50 SiO(2), 22.6 CaO, 5.9 Na(2)O, 4 P(2)O(5), 12 K(2)O, 5.3 MgO and 0.2 B(2)O(3). The optimum sintering conditions for the fabrication of scaffolds by the foam-replica method were identified (sintering temperature: 670 degrees C and dwell time: 5 h). Composite samples were also fabricated by applying a biopolymer coating of poly((D,L)-lactic acid) (PDLLA) using a dip coating process. The average compressive strength values were 0.4 MPa for uncoated and 0.6 MPa for coated scaffolds. In vitro bioactivity studies in simulated body fluid (SBF) showed that a carbonate hydroxyapatite (HCAp) layer was deposited on uncoated and coated scaffolds after only 4 days of immersion in SBF, demonstrating the high in vitro bioactivity of the scaffolds. It was also confirmed that the scaffold structure remained amorphous (no crystallization) after the specific heat treatment used, with scaffolds exhibiting mechanical properties and bioactivity suitable for use in bone tissue engineering applications.

MeSH terms

  • Body Fluids / chemistry*
  • Bone Substitutes / chemistry*
  • Boron / chemistry*
  • Coated Materials, Biocompatible / chemistry*
  • Crystallization
  • Glass / chemistry*
  • Lactic Acid / chemistry*
  • Materials Testing
  • Polyesters
  • Polymers / chemistry*
  • Surface Properties
  • Tissue Engineering / methods*

Substances

  • Bone Substitutes
  • Coated Materials, Biocompatible
  • Polyesters
  • Polymers
  • Lactic Acid
  • poly(lactide)
  • Boron