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Impact Loading01:19

Impact Loading

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
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Loading BMP-2 on nanostructured hydroxyapatite microspheres for rapid bone regeneration.

Panyu Zhou1, Jianghong Wu1, Yan Xia1

  • 1Department of Emergency, Changhai Hospital, Second Military Medical University, Shanghai 200433, People's Republic of China, shuogui126@126.com.

International Journal of Nanomedicine
|July 24, 2018
PubMed
Summary

Nanostructured hydroxyapatite (nHAp) microspheres enhanced bone regeneration by improving bioactive protein adsorption. These nHAp microspheres show promise as carriers for bone tissue engineering applications.

Keywords:
BMP-2bone regenerationhydrothermal transformationhydroxyapatitenanostructure

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Tissue engineering offers a promising approach for bone regeneration, particularly in large bone defects.
  • Material surface morphology and osteoinductive factors are critical for effective bone healing.

Purpose of the Study:

  • To develop and evaluate nanostructured hydroxyapatite (nHAp) microspheres as carriers for bone regeneration.
  • To assess the impact of nanostructure and recombinant human bone morphogenetic protein-2 (rhBMP-2) loading on osteogenesis.

Main Methods:

  • Calcium silicate (CS) microspheres were synthesized via spray-drying, followed by hydrothermal transformation to create nHAp microspheres.
  • The adsorption capacity and release kinetics of BMP-2 on nHAp microspheres were investigated.
  • nHAp and conventional hydroxyapatite (HAp) microspheres, with and without rhBMP-2, were implanted into rat femoral bone defects for 4 and 8 weeks.

Main Results:

  • nHAp microspheres exhibited enhanced adsorption of BMP-2 and reduced initial burst release compared to conventional HAp.
  • Three-dimensional micro-computed tomography (CT) and histomorphometric analyses revealed significantly improved osteogenesis in defects treated with nHAp microspheres combined with rhBMP-2.
  • The nanostructured surface of nHAp microspheres effectively facilitated bone formation.

Conclusions:

  • The nanostructured surface of nHAp microspheres, combined with rhBMP-2, significantly enhances osteogenesis and promotes rapid bone formation.
  • These nHAp microspheres demonstrate considerable potential as effective carriers for bone tissue regeneration applications.