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The Bone Matrix

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...

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Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering

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Biomimetic Nacre-like Hydroxyapatite/Polymer Composites for Bone Implants.

Parinaz Tabrizian¹, Huijun Sun¹, Urangua Jargalsaikhan²

¹Biomaterials Engineering Group, Bristol Dental School, University of Bristol, Bristol BS1 2LY, UK.

Journal of Functional Biomaterials

|August 25, 2023

Summary

Researchers developed nacre-like hydroxyapatite/polymer composites for stronger bone implants. This bio-inspired material mimics natural structures to enhance mechanical strength and fracture toughness, reducing implant failure risks.

Keywords:

bi-directional freeze-casting bioactive biomimetic bone implants fracture toughness hydroxyapatite mechanical properties nacre nacre-like composite

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Published on: August 8, 2022

Area of Science:

Biomaterials Science
Materials Engineering
Orthopedic Research

Background:

Bone implants require enhanced bioactivity, mechanical properties, and durability to minimize revision surgeries.
Hydroxyapatite (HA) offers biocompatibility but lacks mechanical strength.
Natural bone's hierarchical structure provides exceptional strength and toughness, serving as a model for advanced implants.

Purpose of the Study:

To create nacre-like hydroxyapatite/polymer composites that mimic natural bone's layered structure.
To improve the mechanical strength, toughness, and bioactivity of bone implant materials.
To reduce the incidence of implant fracture and enhance long-term stability.

Main Methods:

Bi-directional freeze-casting technique to produce elongated lamellar hydroxyapatite.
Densification and polymer infiltration to create nacre-like HA/polymer composites.
Mechanical characterization including flexural strength, Young's modulus, and fracture toughness testing.

Main Results:

Nacre-like HA/polymer composites exhibited enhanced strength and toughness compared to traditional HA/PMMA.
Composites with 80 vol.% ceramic fraction showed improved flexural strength (158 MPa) and Young's modulus (24 GPa).
Fracture toughness increased significantly with higher ceramic content, reaching 5.27 MPa·m^1/2 at 80 vol.% HA.

Conclusions:

Nacre-like layered structures in HA/polymer composites effectively enhance mechanical properties.
The developed composites show potential for improved bone implant performance and longevity.
This bio-inspired approach offers a promising strategy for next-generation orthopedic implants.