Formation of alkali-soluble fluoride on the surface of human dental enamel after treatment with fluoridated gels: influence of the pH variation and of the treatment time

J Clin Pediatr Dent. 2000 Summer;24(4):303-7. doi: 10.17796/jcpd.24.4.1l437256773n453u.

Abstract

The aim of this study was to quantify, in vitro, the formation of CaF2 after the application of three fluoridated gels: one neutral, one acidulated and another highly acidulated, on a bovine enamel dental surface treated with a Dijkman's demineralizing solution (1990). 145 sections were utilized, obtained from 145 sound teeth and divided into seven groups: C (enamel without treatment); FN1 (enamel demineralized and treated with neutral gel for 1 minute); FN4 (enamel demineralized and treated with neutral gel for 4 minutes); FFA1 (enamel demineralized and treated with acidulated gel for 1 minute); FFA4 (enamel demineralized and treated with acidulated gel for 4 minutes); FAA1 (enamel demineralized and treated with highly acidulated gel for 1 minute) and FAA4 (enamel demineralized and treated with highly acidulated gel for 4 minutes). The formation of CaF2 was analyzed by SEM and chemically by Caslavska's method (1975). The average and standard deviations from the groups studied were respectively: C-0.63; 0.38; FN1-23.06; 16.52; FFA1-54.11; 49.00; FAA1-43.87; 32.66; FN4-34.92; 23.00; FFA4-67.91; 42.36; FAA4-56.03; 38.96. (Mann-Whitney non-parametric test). The time of application did not interfere in the CaF2 formation from the acidulated and highly-acidulated gels. A minor concentration of fluoride and amount of pH from highly-acidulated gel did not affect the higher formation from the CaF2 in relation to the acidulated gel in both cases when the application was evaluated.

Publication types

  • Comparative Study

MeSH terms

  • Acidulated Phosphate Fluoride / administration & dosage
  • Acidulated Phosphate Fluoride / chemistry
  • Animals
  • Calcium Fluoride / analysis*
  • Cattle
  • Dental Enamel
  • Fluorides, Topical / administration & dosage
  • Fluorides, Topical / chemistry*
  • Gels
  • Humans
  • Hydrogen-Ion Concentration
  • Microscopy, Electron, Scanning
  • Sodium Fluoride / administration & dosage
  • Sodium Fluoride / chemistry
  • Statistics, Nonparametric
  • Time Factors

Substances

  • Fluorides, Topical
  • Gels
  • Acidulated Phosphate Fluoride
  • Sodium Fluoride
  • Calcium Fluoride