Fluoride and silver concentrations of silver diammine fluoride solutions for dental use

Objective To determine the short‐term stability of free fluoride ion concentrations and acidity (p H values) of three commercially available SDF solutions over time. Methods Three SDF products for caries control were studied: C ariestop‐12%, C ariestop‐30% and S aforide‐38%. Their expected fluoride ion concentrations were 14,200, 35,400 and 44,800 ppm, respectively. The fluoride ion concentrations were determined with an ion‐selective electrode. The acidity was determined with a p H electrode. The measurements were performed when open and at 7 and 28 days. Results The mean fluoride ion concentrations of the freshly opened bottles were 12,525 ± 450, 13,200 ± 2060 and 55,800 ± 2536 ppm, respectively. The mean pH values were 9.4 ± 0.1, 10.4 ± 0.1 and 10.2 ± 0.2, respectively. No significant change ( P  > 0.05) in the fluoride ion concentrations or the acidity was detected after 7 or 28 days. Conclusion The three SDF tested solutions were alkaline. The fluoride ion concentrations of C ariestop‐30% and S aforide‐38% were considerably different. The fluoride ion concentrations and acidity of the products demonstrated a short‐term stability over 28 days.