West China Journal of Stomatology

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Evaluation of Acid Diffusion and Fluoride Selective Electrode to Measure the Total Fluoride in Toothpastes

WANG Xiao-ling, CHENG Chuo-yue, GE Yao, WANG Qin   

  1. Dept. of Preventive Dentistry, Peking University School of Stomatology, Beijing 100081, China
  • Received:2006-10-25 Revised:2006-10-25 Online:2006-10-20 Published:2006-10-20

Abstract:

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 HClO4 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. Conclusion  The amount of total
fluoride in the calcium containing toothpaste can be detected simply and accurately measured by acid diffusion and fluoride selective electrode. 

Key words: acid diffusion and fluoride selective electrode, fluoride-containing toothpaste, total fluoride