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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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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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Bone Structure01:55

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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
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Bone Formation by Intramembranous Ossification01:29

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Bone Cells and Tissue01:30

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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An introduction to bone tissue engineering.

Željka Perić Kačarević1, Patrick Rider2, Said Alkildani3

  • 1Department of Anatomy Histology, Embryology, Pathology Anatomy and Pathology Histology, Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia.

The International Journal of Artificial Organs
|September 24, 2019
PubMed
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Critical-sized bone defects hinder natural regeneration, necessitating advanced bone scaffolds. This review explores bone tissue engineering scaffolds, their materials, and methods for enhanced bone regeneration.

Keywords:
Bone tissue engineeringbone remodellingmacrophagesosteoconductiveosteoinductive

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Engineering

Background:

  • Bone tissue possesses intrinsic regenerative capacity, but critical-sized defects impede this process, requiring therapeutic intervention.
  • Traditional bone grafting materials (autograft, allograft) present limitations including rapid degradation, poor bioactivity, and disease transmission risks.
  • Bone tissue engineering offers a promising alternative for regenerating functional bone tissue.

Purpose of the Study:

  • To review the fundamental requirements for bone tissue engineering scaffolds.
  • To explore various biomaterials and manufacturing techniques for scaffold development.
  • To discuss the integration of bioactive molecules, growth factors, and cells into scaffolds.

Main Methods:

  • Literature review of bone regeneration processes and scaffold requirements.
  • Analysis of different biomaterials used in bone scaffold fabrication.
  • Examination of scaffold design principles for osteoconduction, mechanical stability, and degradation.

Main Results:

  • Scaffolds must support osteoconduction, provide mechanical integrity, and possess appropriate degradation kinetics.
  • Diverse biomaterials offer unique advantages and disadvantages for bone regeneration applications.
  • Incorporation of bioactive factors and cells can significantly enhance scaffold performance.

Conclusions:

  • Effective bone tissue engineering scaffolds require careful consideration of material properties, design, and biological integration.
  • Advancements in biomaterials and fabrication techniques are crucial for overcoming limitations of current bone regeneration strategies.
  • Future research should focus on optimizing scaffold-induced osteogenesis and long-term integration for clinical success.