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Surface characterization of silver-doped bioactive glass
E Vernè1, S Di Nunzio, M Bosetti
1Materials Science and Chemical Engineering Department, Polytechnic of Turin C.so Duca degli Abruzzi 24 10129 Turin, Italy.
Biomaterials
|March 29, 2005
Summary
Silver-doped bioactive glass shows enhanced bioactivity and antimicrobial properties. This material is bioactive and non-cytotoxic, making it suitable for bone regeneration applications.
Area of Science:
- Biomaterials Science
- Materials Chemistry
- Biomedical Engineering
Background:
- Bioactive glasses (BGs) are known for their ability to bond with bone tissue.
- Incorporating antimicrobial agents into BGs can prevent implant-associated infections.
- Silver (Ag) is a well-established antimicrobial agent with low cytotoxicity.
Purpose of the Study:
- To prepare silver-doped bioactive glasses (Ag-BGs) using ion exchange methods.
- To evaluate the bioactivity, antimicrobial efficacy, and cytotoxicity of the Ag-BGs.
- To assess the potential of Ag-BGs for bone regeneration applications.
Main Methods:
- Synthesis of SiO(2)-CaO-Na(2)O bioactive glass.
- Silver ion doping via molten salt and aqueous solution ion exchange.
- Characterization using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy-Dispersive Spectroscopy (EDS).
- Bioactivity assessment via simulated body fluid (SBF) immersion.
- Silver ion release analysis using Graphite Furnace Atomic Absorption Spectroscopy (GFAAS).
- Cytotoxicity evaluation on osteogenic cells.
Main Results:
- Surface silver doping was successfully achieved using both molten salt and aqueous solution methods.
- The silver-doped bioactive glasses maintained or improved the bioactivity of the parent glass, indicated by apatite formation.
- Released silver ion concentrations in SBF were within the range reported for antibacterial activity and non-cytotoxicity.
- Preliminary cytotoxicity tests showed favorable osteogenic cell adhesion and proliferation on the doped surfaces.
Conclusions:
- Silver doping is an effective strategy to impart antimicrobial properties to bioactive glasses without compromising their bioactivity.
- The developed Ag-BGs exhibit a promising balance of bioactivity, antimicrobial effect, and low cytotoxicity.
- These findings suggest that silver-doped bioactive glasses are potential candidates for developing next-generation bone regenerative materials with enhanced infection resistance.