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Related Concept Videos

Fractures: Bone Repair01:27

Fractures: Bone Repair

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
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Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Related Experiment Video

Updated: Oct 2, 2025

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
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Oxygen generating scaffolds regenerate critical size bone defects.

Sanika Suvarnapathaki1,2, Xinchen Wu1,2, Tengfei Zhang3

  • 1Biomedical Engineering and Biotechnology Program, University of Massachusetts Lowell, One University Avenue, Lowell, MA, 01854, USA.

Bioactive Materials
|February 28, 2022
PubMed
Summary

New biomaterial scaffolds generate oxygen to improve bone tissue engineering. These novel scaffolds promote bone regeneration and vascularization, offering promising applications in regenerative medicine.

Keywords:
BoneCalcium peroxideCranial regenerationCritical size defectOxygen

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Vasculature is crucial for tissue viability and graft maturation in bone regeneration.
  • Current bone tissue engineering strategies require immediate oxygen supply.
  • Oxygen-generating biomaterials offer a promising alternative to vascularization.

Purpose of the Study:

  • To develop a novel oxygen-generating tissue scaffold with predictable oxygen release and tunable material properties.
  • To evaluate the scaffold's performance in vitro and in vivo for bone regeneration.

Main Methods:

  • Hydrogel scaffolds reinforced with calcium peroxide (CaO2) and polycaprolactone (PCL) microparticles were fabricated.
  • Mechanical strength and swelling ratios were characterized.
  • In vitro cell viability, metabolic activity, and osteogenic differentiation were assessed.
  • In vivo studies in rodent models evaluated bone volume, defect regeneration, remodeling, and vascularization.

Main Results:

  • Scaffolds exhibited tunable mechanical strength (5-34 kPa) and swelling ratios (11-25%).
  • Consistent tissue viability, metabolic activity, and osteogenic differentiation were observed in vitro.
  • In vivo studies showed support for 70 mm3 bone volume and over 90% regeneration in critical-sized defects.
  • Tartrate-resistant acid phosphatase (TRAP) and vascular endothelial growth factor (VEGF) staining confirmed bone remodeling and vascularization.

Conclusions:

  • The developed oxygen-generating scaffolds demonstrate predictable oxygen release and modular properties.
  • These scaffolds effectively support bone regeneration, vascularization, and remodeling in vivo.
  • The technology holds significant potential for bone substitutes and regenerative medicine applications.