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This study developed a novel functionally graded material (FGM) using thiolated poly(vinyl alcohol) (TPVA) and nano-hydroxyapatite (nano-HA) for bone tissue engineering. The TPVA-HA composite shows promise as a guided bone regeneration membrane.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Functionally graded materials (FGMs) mimic bone's hierarchical structure, making them ideal for bone tissue engineering.
  • Thiolated poly(vinyl alcohol) (TPVA) offers a versatile polymer matrix for FGMs.
  • Nano-hydroxyapatite (nano-HA) is a key component for enhancing bone regeneration properties.

Purpose of the Study:

  • To design and develop a novel FGM based on TPVA and nano-HA with graded bioactivity, cell compatibility, and degradability.
  • To create a composite material suitable for bone regeneration applications.
  • To evaluate the potential of this FGM as a guided bone regeneration (GBR) membrane.

Main Methods:

  • Fabrication of TPVA hydrogel via thiol-ene click reaction, avoiding byproducts.
  • Incorporation of freshly precipitated and spray-dried nano-HA into TPVA hydrogel in graded concentrations.
  • Lyophilization to create porous FGM sheets.
  • In vitro characterization including tensile strength, degradation studies in PBS, bioactivity in SBF, and cytocompatibility with human periodontal ligament cells.

Main Results:

  • The TPVA-HA FGM exhibited enhanced tensile strength and degradation rates compared to bare TPVA in vitro.
  • Bioactivity was confirmed through apatite formation in simulated body fluid (SBF).
  • Excellent cytocompatibility was demonstrated with human periodontal ligament cells.

Conclusions:

  • The fabricated TPVA-HA composite FGMs possess desirable mechanical, bioactive, and cytocompatible properties.
  • These FGMs show significant potential for use as guided bone regeneration (GBR) membranes.
  • The study highlights the successful development of a tunable biomaterial for bone regeneration.