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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.
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.
