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Updated: Sep 5, 2025

Gradient Strain Chip for Stimulating Cellular Behaviors in Cell-laden Hydrogel
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Hydrogel Swelling-Mediated Strain Induces Cell Alignment at Dentin Interfaces.

David Fraser1,2, Tram Nguyen3, Alexander Kotelsky3

  • 1Eastman Institute for Oral Health, Department of Periodontology, University of Rochester Medical Center, Rochester, New York 14620, United States.

ACS Biomaterials Science & Engineering
|July 6, 2022
PubMed
Summary

This study engineered periodontal ligament cells (PDLCs) using poly(ethylene glycol) hydrogels. Hydrogel swelling induced PDLC alignment perpendicular to dentin, offering a novel method for tissue engineering.

Keywords:
cell alignmentdentinhydrogelsperiodontal ligament cellsstrainswelling

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cell Biology

Background:

  • Cell and tissue alignment is crucial for periodontal tissue function.
  • Periodontal tissue engineering requires scaffolds that guide cell alignment relative to tooth root surfaces.

Purpose of the Study:

  • To develop a method for controlling periodontal ligament cell (PDLC) alignment adjacent to dentin surfaces.
  • To explore poly(ethylene glycol) (PEG)-based hydrogels as tunable matrices for directing PDLC activity.

Main Methods:

  • A composite system of dentin blocks, PEG hydrogels, and PDLCs was created.
  • PDLC alignment was controlled by manipulating hydrogel swelling.
  • Predictive modeling and replication with various materials and cells were used to validate findings.

Main Results:

  • Minimal hydrogel swelling resulted in random PDLC alignment.
  • Hydrogel swelling induced PDLC alignment perpendicular to the dentin surface.
  • The degree of alignment increased with increasing hydrogel swelling.

Conclusions:

  • PDLC alignment is a biomechanical response to swelling-mediated strain.
  • This study presents a novel method for inducing cell alignment adjacent to stiff surfaces via applied strain.
  • The findings provide a model for studying and engineering aligned periodontal and other tissues.