Stannous Source in Toothpastes Leads to Differences in Their Antimicrobial Efficacy

Area of Science:

• Microbiology
• Dental Materials Science
• Antimicrobial Agents

Background:

• Streptococcus mutans is a primary etiological agent of dental caries.
• Stannous fluoride (SnF2) and stannous chloride (SnCl2) are known for their antimicrobial properties in oral care products.
• Amine fluoride (AmF) is commonly used in toothpaste formulations for caries prevention.

Purpose of the Study:

• To evaluate and compare the in-vitro antimicrobial efficacy of experimental toothpastes utilizing different stannous sources.
• To assess the impact of stannous chloride versus stannous fluoride on Streptococcus mutans biofilm activity.

Main Methods:

• In-vitro study using Streptococcus mutans biofilms grown on glass disks.
• Exposure of biofilms to experimental toothpaste slurries containing varying stannous sources (SnCl2, SnF2) and amine fluoride (AmF).
• Assessment of biofilm metabolic activity via isothermal microcalorimetry over 96 hours, analyzing growth rate and lag time.

Main Results:

• All tested toothpastes significantly increased biofilm lag time and reduced growth rate compared to the control.
• Toothpastes containing stannous fluoride (SnF2) demonstrated significantly greater antimicrobial efficacy than those with stannous chloride (SnCl2).
• Specific SnF2 formulations achieved up to 61.9% reduction in active biofilm, outperforming SnCl2 formulations.

Conclusions:

• Toothpastes combining stannous fluoride (SnF2) with amine fluoride (AmF) exhibit the highest antimicrobial efficacy.
• The source of stannous ion significantly influences the antimicrobial performance of toothpaste formulations.
• These findings support the use of SnF2-based toothpastes for enhanced control of Streptococcus mutans biofilms.