Ag-doped 45S5 Bioglass®-based bone scaffolds by molten salt ion exchange: processing and characterisation

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Bone tissue engineering requires scaffolds with both therapeutic and antibacterial properties.
• Silver ions (Ag+) are effective antibacterial agents with broad efficacy against resistant bacteria like MRSA.
• 45S5 Bioglass(®) is a bioactive material suitable for bone regeneration applications.

Purpose of the Study:

• To develop silver-ion-functionalized 45S5 Bioglass(®) scaffolds for bone tissue engineering.
• To evaluate the antibacterial potential and bioactivity of these modified scaffolds.
• To confirm the efficacy of ion exchange for silver incorporation.

Main Methods:

• Fabrication of 45S5 Bioglass(®) scaffolds using the foam replication technique.
• Introduction of silver ions (Ag+) onto scaffold surfaces via an ion exchange method.
• Tailoring ion exchange parameters to control Ag+ ion release.
• In vitro bioactivity testing in simulated body fluid.
• Assessment of human periodontal ligament stromal cell attachment and viability.

Main Results:

• The ion exchange method successfully introduced Ag+ ions onto 45S5 Bioglass(®) scaffolds.
• Scaffold bioactivity and physical properties (e.g., porosity) were maintained post-silver incorporation.
• Controlled and predictable Ag+ ion release behavior was achieved.
• Low concentrations of silver ions supported human cell attachment and viability.
• The modified scaffolds demonstrated therapeutic and antibacterial potential.

Conclusions:

• Ion exchange is an effective technique for incorporating Ag+ ions into 45S5 Bioglass(®) scaffolds.
• The functionalized scaffolds retain essential properties for bone tissue engineering.
• These silver-containing scaffolds show promise for enhanced bone regeneration therapies.