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Biomedical Porous Shape Memory Alloys for Hard-Tissue Replacement Materials.
Bin Yuan1,2, Min Zhu3,4, Chi Yuen Chung5
1School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China. apsheng@scut.edu.cn.
Materials (Basel, Switzerland)
|September 16, 2018
Summary
Porous shape memory alloys (SMAs) show promise for hard-tissue replacements due to their superelasticity and biocompatibility. Research focuses on optimizing their structure and surface for improved clinical applications.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Orthopedic Research
Background:
- Porous shape memory alloys (SMAs), including NiTi and Ni-free Ti-based alloys, offer unique properties like superelasticity (SE), biocompatibility, and low elastic modulus for hard-tissue replacements.
- Challenges include Ni ion release from porous NiTi SMAs and lower SE in porous Ni-free SMAs, hindering clinical use.
- This review focuses on advancements in porous SMAs for hard-tissue replacements, addressing synthesis and surface modification.
Purpose of the Study:
- To review recent research on porous NiTi and Ni-free SMAs for hard-tissue replacements.
- To highlight progress in synthesizing porous SMAs with tailored properties.
- To discuss surface modifications for enhanced biocompatibility and reduced Ni ion release.
Main Methods:
- Review of recent literature on porous shape memory alloys.
- Analysis of synthesis techniques for controlling porous structure, microstructure, and mechanical/biological properties.
- Evaluation of surface modification strategies for bio-inert or bio-active surfaces.
Main Results:
- Porous SMAs can be fabricated with controlled porosity (30-85%) and pore sizes.
- Achieved properties include elastic modulus of 0.4-15 GPa and SE > 2.5%, with good cell and tissue biocompatibility.
- Applications include maxillofacial repair, dental implants, and spinal fusion.
Conclusions:
- Optimized porous SMAs with tailored structures and bioactive surfaces are competitive candidates for hard-tissue replacements.
- Further research on structure-property relationships and surface modifications is recommended.
- Porous SMAs demonstrate significant potential for various orthopedic and dental applications.
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