Related Experiment Video
Updated: Dec 26, 2025
14:49
Direct and Indirect Culture Methods for Studying Biodegradable Implant Materials In Vitro
Published on: April 15, 2022
5.5K
Biodegradable Magnesium Bone Implants Coated with a Novel Bioceramic Nanocomposite
Mehdi Razavi1,2,3,4, Mohammadhossein Fathi3,4, Omid Savabi5
1BiionixTM (Bionic Materials, Implants & Interfaces) Cluster, Department of Internal Medicine, College of Medicine, University of Central Florida, Orlando, FL 32827, USA.
Materials (Basel, Switzerland)
|March 19, 2020
Summary
This study developed a double-layer coating for magnesium (Mg) implants to reduce corrosion. The enhanced AZ91 Mg implants showed improved bone formation and reduced inflammation, making them promising biodegradable biomaterials.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Orthopedic Research
Background:
- Magnesium (Mg) alloys offer bone-like mechanical properties for biodegradable implants.
- Rapid corrosion of Mg alloys in vivo limits their clinical application before bone healing.
- A protective coating is essential to control Mg alloy degradation and enhance biocompatibility.
Purpose of the Study:
- To develop a double protective layer on AZ91 magnesium alloy to reduce corrosion rate.
- To enhance the bioactivity and osseointegration of biodegradable Mg implants.
- To evaluate the in vivo performance of the coated Mg implant.
Main Methods:
- Surface treatment of AZ91 Mg alloy using micro-arc oxidation (MAO) to form an intermediate layer.
- Coating the MAO-treated surface with a bioceramic nanocomposite (diopside, bredigite, fluoridated hydroxyapatite) via electrophoretic deposition (EPD).
- In vivo evaluation of the coated and uncoated AZ91 implants, including corrosion assessment and histological analysis.
Main Results:
- The MAO/EPD bioceramic nanocomposite coating significantly reduced the corrosion rate of AZ91 Mg implants.
- Coated implants exhibited enhanced bioactivity and improved new bone formation compared to uncoated controls.
- A notable reduction in hydrogen bubble release and surrounding tissue inflammation was observed with the coated implants.
Conclusions:
- The developed MAO/EPD bioceramic nanocomposite coating effectively reduces the corrosion of AZ91 Mg implants.
- This double-layer strategy significantly improves the bioactivity and osseointegration of biodegradable Mg implants.
- The diopside-bredigite-FHA coated AZ91 Mg alloy shows great potential for orthopedic applications.
