[Evaluation of acid diffusion and fluoride selective electrode to measure the total fluoride in toothpastes].
OBJECTIVE
To evaluate the reliability of a method of measuring the total fluoride in fluoride-containing toothpastes with acid diffusion and fluoride selective electrode.


METHODS
Four brands of commercially available non-fluoride toothpastes and fluoride-containing toothpastes were sampled. Fluoride was extracted from the toothpastes in 2 mol/L HC10(4) at room temperature overnight and then subjected to the measurement with fluoride electrode.


RESULTS
Fluoride recovery of the non-fluoride toothpastes containing calcium as abrasive by this method was 99.5%-100.5%, more than 94% of total fluoride was measured from the marketed fluoride toothpastes, and the variation coefficient of this method was less than 1.54%. While the abrasive was silicon, the fluoride recovery of the non-fluoride toothpastes was 83.4%, and 89.7% of total fluoride was measured from the marketed fluoride-containing toothpastes.


CONCLUSIONS
The amount of total fluoride in the calcium containing toothpaste can be detected simply and accurately measured by acid diffusion and fluoride selective electrode.
Wang
Xiao-Ling
XL
Dept. of Preventive Dentistry, Peking University School of Stomatology, Beijing 100081, China.
Cheng
Chuo-Yue
CY
Ge
Yao
Y
Wang
Qin
Q
D002118:Calcium; D004566:Electrodes; D005459:Fluorides; D010710:Phosphates; D015203:Reproducibility of Results; D012969:Sodium Fluoride; D014100:Toothpastes
D010710:Phosphates; D014100:Toothpastes; C012980:fluorophosphate; D012969:Sodium Fluoride; D005459:Fluorides; D002118:Calcium