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Shape memory polymer (SMP) scaffolds with improved self-fitting properties.

Michaela R Pfau1, Kelly G McKinzey, Abigail A Roth

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA. mgrunlan@tamu.edu.

Journal of Materials Chemistry. B
|May 12, 2021
PubMed
Summary
This summary is machine-generated.

New shape memory polymer scaffolds using star-shaped polymers offer improved tissue integration for craniomaxillofacial bone defects. These scaffolds have a lower fitting temperature and faster degradation, enhancing their clinical potential.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • "Self-fitting" shape memory polymer (SMP) scaffolds show promise for craniomaxillofacial (CMF) bone defects.
  • Previous linear polymer-based semi-interpenetrating network (semi-IPN) scaffolds had limitations including high fitting temperatures (Tfit ~55°C) and precursor solution viscosity.
  • These limitations hinder clinical application due to potential tissue damage and restricted scaffold size.

Purpose of the Study:

  • To develop novel semi-IPN SMP scaffolds with star-shaped polymers to overcome limitations of linear polymer-based scaffolds.
  • To investigate the impact of star-polymer architecture on scaffold properties, including fitting temperature, degradation rate, mechanical properties, and processability.
  • To evaluate the potential of these improved scaffolds for treating CMF bone defects.

Main Methods:

  • Fabrication of semi-IPN SMP scaffolds using four compositions: linear-PCL-DA/linear-PLLA (L/L), linear-PCL-DA/star-PLLA (L/S), star-PCL-TA/linear-PLLA (S/L), and star-PCL-TA/star-PLLA (S/S).
  • Preparation of linear-PCL-DA (LPCL) and star-PCL-TA (SPCL) controls.
  • Characterization of scaffold properties including fitting temperature (Tfit), degradation rate, radial expansion pressure, and precursor solution viscosity.

Main Results:

  • The star-PCL-TA/star-PLLA (S/S) semi-IPN scaffold demonstrated a significantly lower, tissue-safe Tfit (~45°C).
  • The S/S scaffold exhibited the fastest degradation rate, promoting neotissue infiltration.
  • S/S scaffolds exerted greater radial expansion pressure than LPCL controls, enhancing osseointegration and mechanical stability, and precursor solution viscosity was reduced allowing for larger scaffold fabrication.

Conclusions:

  • Star-polymer architecture in semi-IPN SMPs leads to improved properties for CMF bone defect treatment.
  • The S/S scaffold offers a safer and more effective alternative to previous linear polymer scaffolds.
  • These findings support the potential clinical translation of star-polymer-based SMP scaffolds for bone regeneration.