Microsphere-based selective laser sintering for building macroporous bone scaffolds with controlled microstructure...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Additive Manufacturing

Background:

• Fabricating bulk biomaterials with controlled structures and properties is crucial for tissue engineering.
• Current methods face challenges in achieving desired structural and mechanical characteristics.

Purpose of the Study:

• To develop a feasible protocol for fabricating 3D bone scaffolds with controlled multi-scaled porosity.
• To evaluate the biocompatibility and efficacy of these scaffolds in promoting bone regeneration.

Main Methods:

• Synthesized pure polycaprolactone (PCL) and PCL/hydroxyapatite (HA) composite microspheres using a modified solvent evaporation method.
• Fabricated 3D bone scaffolds using selective laser sintering (SLS) with the prepared microspheres.
• Conducted in vitro and in vivo evaluations to assess scaffold performance.

Main Results:

• The synthesized microspheres exhibited uniform size and monodispersity.
• SLS-derived scaffolds presented a multi-scaled porous structure with adequate mechanical properties.
• In vitro studies showed enhanced stem cell adhesion, proliferation, and differentiation.
• In vivo evaluations demonstrated excellent histocompatibility and induced vascularization.

Conclusions:

• Selective laser sintering (SLS) provides a viable method for fabricating biomimetic bone biomaterials.
• The developed 3D scaffolds effectively support stem cell behavior and promote tissue regeneration.
• This approach offers a new pathway for creating advanced bulk biomaterials for various applications.