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Composite PCL Scaffold With 70% β-TCP as Suitable Structure for Bone Replacement.

Benedetta Ghezzi1, Biagio Matera2, Matteo Meglioli2

  • 1Centro Universitario di Odontoiatria, Dipartimento di Medicina e Chirurgia, Università di Parma, Parma, Italy; Istituto dei Materiali per l'Elettronica ed il Magnetismo, Consiglio Nazionale delle Ricerche, Parma, Italy.

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Researchers optimized polycaprolactone (PCL)/β-tricalcium phosphate (β-TCP) bone scaffolds using 3D printing, achieving higher β-TCP concentrations for improved mechanical and biological properties. These advanced biomaterials show promise for bone regeneration.

Keywords:
3D printingBone regenerationPCLSolvent-freeTissue engineeringβ-TCP

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Additive Manufacturing

Background:

  • Developing synthetic bone graft substitutes requires biomaterials that mimic the mechanical and biological properties of natural bone.
  • Polycaprolactone (PCL) and β-tricalcium phosphate (β-TCP) are promising components for bone regeneration scaffolds.
  • Current fabrication methods often limit the incorporation of high β-TCP percentages, potentially compromising scaffold performance.

Purpose of the Study:

  • To optimize printable polycaprolactone (PCL)/β-tricalcium phosphate (β-TCP) biomaterials for enhanced bone regeneration.
  • To achieve balanced mechanical characteristics in PCL/β-TCP scaffolds that resemble human cancellous bone.
  • To improve osteogenesis through the development of advanced biomaterials with high β-TCP content.

Main Methods:

  • Fabrication of PCL/β-TCP scaffolds using customized filaments for fused deposition modeling (FDM) 3D printing.
  • Systematic variation of β-TCP content in the composite filaments.
  • Evaluation of mechanical properties, surface topography, wettability, cytocompatibility, cell adhesion, and differentiation.

Main Results:

  • Optimized fabrication parameters for PCL/β-TCP scaffolds with up to 70% β-TCP, exceeding the literature limit of 60%.
  • Composite surfaces exhibited increased hydrophilicity and surface roughness compared to controls.
  • Young's modulus significantly increased with β-TCP incorporation, indicating enhanced mechanical strength; improved cellular growth and osteoblastic differentiation were observed.

Conclusions:

  • A solvent-free FDM approach enables the fabrication of PCL/β-TCP scaffolds with high β-TCP concentrations (up to 70%).
  • 3D printing combined with customized biomaterials allows for personalized scaffolds with optimal mechanical and biological features mimicking bone.
  • These advanced scaffolds hold significant promise for innovative bone and periodontal regeneration strategies.