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Published on: July 11, 2012
Safety-constrained evaluation of antibacterial multicomponent borate glasses
Christine Andrea1, Daniel Boyd2
1School of Biomedical Engineering, Dalhousie University, Halifax B3H 4R2, NS, Canada.
Biomaterials and Biosystems
|May 29, 2026
Summary
Designing soluble, ion-releasing glasses for toothpaste requires balancing efficacy and safety. This study developed a framework to optimize multi-ion glass compositions for effective antibacterial activity against Streptococcus mutans while ensuring safety under realistic use conditions.
Area of Science:
- Biomaterials Science
- Dental Materials
- Materials Chemistry
Background:
- Soluble ion-releasing materials for transient applications need to balance performance and safety.
- Designing effective and safe multi-ion delivery systems requires understanding complex compositional effects.
Purpose of the Study:
- To develop a clinically parameterized framework for designing multi-ion, soluble glasses for toothpaste.
- To integrate a Design-of-Mixtures approach with brushing-relevant extraction conditions.
- To evaluate the dissolution, ion release, and antibacterial activity of glasses against Streptococcus mutans.
Main Methods:
- Synthesized and characterized glasses within a constrained Ag2O-NaF-CaO design domain.
- Evaluated 2-minute aqueous extracts for dissolution, ion release, and antibacterial activity.
- Applied an ISO 10993-17-aligned toxicological risk assessment for safety evaluation.
Main Results:
- Calcium release established a remineralization-relevant baseline.
- Silver-mediated antibacterial activity was non-monotonic and composition-dependent.
- Identified Ag2O-NaF interaction effects supporting fluoride availability and antimicrobial performance.
Conclusions:
- Engineered antibacterial potency through controlled dissolution rather than increased silver loading.
- Provided a safety-constrained framework for evaluating antibacterial ion-releasing glasses.
- Demonstrated a workflow for assessing transient, multi-ion delivery materials under realistic conditions.
