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Angiogenic hydrogels for dental pulp revascularization.

Zain Siddiqui1, Biplab Sarkar1, Ka-Kyung Kim1

  • 1Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, USA.

Acta Biomaterialia
|March 10, 2021
PubMed
Summary

Acellular peptide hydrogels promote new blood vessel growth and soft tissue regeneration in dental pulp repair. This breakthrough offers a promising scaffold for endodontic tissue engineering and future clinical applications.

Keywords:
Acellular scaffoldsAngiogenesisPulp revascularizationSelf-assemblyTissue regeneration

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Endodontics

Background:

  • Angiogenesis is crucial for tissue healing, but promoting it in dental pulp implants after pulpectomy remains a significant endodontic challenge.
  • Lack of vascularization in current implants hinders host tissue integration and effective soft tissue regeneration.
  • Developing materials that support in situ angiogenesis is vital for advancing endodontic tissue engineering.

Purpose of the Study:

  • To develop and evaluate acellular self-assembling peptide hydrogels as scaffolds for promoting angiogenesis and soft tissue regeneration in dental pulp.
  • To investigate the potential of these hydrogels to create extracellular matrix mimetic architectures that guide neovascularization and tissue deposition in vivo.
  • To assess the therapeutic utility of angiogenic hydrogels in regenerating vascularized pulp-like tissue in a large animal model.

Main Methods:

  • Fabrication of acellular self-assembling peptide hydrogels with tunable properties, including injectability and sequence-level functionalizability.
  • In vivo implantation of the angiogenic hydrogels in a canine orthotopic model to assess their capacity for soft tissue regeneration.
  • Histological and immunohistochemical analyses to evaluate neovascularization, tissue deposition, and recapitulation of native pulp features.

Main Results:

  • The peptide hydrogels successfully guided in vivo development of neovasculature and extracellular matrix deposition.
  • Implanted hydrogels supported the regeneration of vascularized pulp-like soft tissue, recapitulating key native pulp features.
  • Regenerated tissue exhibited blood vessels, neural filaments, and an odontoblast-like layer adjacent to dentinal tubules.

Conclusions:

  • Acellular self-assembling peptide hydrogels serve as potent scaffolds for promoting soft tissue regeneration and angiogenesis in vivo.
  • These materials offer a promising, growth factor-free approach to enhance vascularization in endodontic implants.
  • The study establishes a foundation for translating these angiogenic biomaterials into preclinical and clinical applications for pulp regeneration.