title: 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.
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.
authors: Pediatric Dentistry, School of Dentistry, State University of Feira de Santana, Feira de Santana, BA, Brazil.
authors: A R
authors: AR
authors: Guimarães
authors: A
authors: A
authors: Modesto
authors: A R
authors: AR
authors: Vieira
mesh_terms: D000149:Acidulated Phosphate Fluoride / Q000008:administration & dosage / Q000737:chemistry; D000818:Animals; D002124:Calcium Fluoride / Q000032:analysis*; D002417:Cattle; D003743:Dental Enamel; D005460:Fluorides, Topical / Q000008:administration & dosage / Q000737:chemistry*; D005782:Gels; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D012969:Sodium Fluoride / Q000008:administration & dosage / Q000737:chemistry; D018709:Statistics, Nonparametric; D013997:Time Factors
chemical_list: D005460:Fluorides, Topical; D005782:Gels; D000149:Acidulated Phosphate Fluoride; D012969:Sodium Fluoride; D002124:Calcium Fluoride