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Bioengineered Injectable Hydrogel Based on the Dentin Extracellular Matrix and Chitosan.

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Summary
This summary is machine-generated.

A novel injectable hydrogel was developed from dentin extracellular matrix and chitosan. This smart biomaterial shows potential as a scaffold for regenerating damaged load-bearing tissues like bone.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Dentin extracellular matrix offers valuable macromolecules for novel smart biomaterial development.
  • Chitosan is a versatile biopolymer with applications in regenerative medicine.

Purpose of the Study:

  • To develop an injectable, thermosensitive hydrogel scaffold from dentin extracellular macromolecules and chitosan.
  • To characterize the physical, mechanical, and biocompatibility properties of the engineered hydrogel.

Main Methods:

  • Blending of dentin macromolecules and chitosan to form a prehydrogel.
  • Optimization of extrudability and gelation parameters.
  • Fabrication of 3D constructs via injection and incubation at 37 °C.
  • Characterization using FTIR, porosity, water diffusion, mechanical testing, and cell culture.

Main Results:

  • Successful integration of dentin matrix and chitosan confirmed by FTIR.
  • Constructs exhibited ~51% porosity and reached water diffusion plateau within 2 days.
  • Low MPa elastic moduli were observed, decreasing after simulated body fluid (SBF) storage.
  • Enhanced biodegradability in SBF with lysozyme or zinc ions.
  • Confirmed hydrogel bioactivity and biocompatibility with undifferentiated pulp cells (OD-21).

Conclusions:

  • The developed injectable hydrogel is a promising smart biomaterial.
  • It holds potential as a scaffold for regenerating damaged load-bearing tissues, including dentin and bone.
  • Further research can explore its application in bone and dentin defect repair.