Fluoride uptake by partially-decalcified enamel: a study of possible involvement of acid phosphate ions.
Ionic fluoride and HPO(2-)4 concentrations were determined in partially-decalcified enamels before and after exposure to NaF or MFP toothpastes, to determine whether fluoride uptake could be attributed to reactions with HPO(2-)4. Acid phosphate concentrations did not alter upon exposure to fluoride, even though large uptake of fluoride did occur. Infra-red spectroscopy showed HPO(2-)4 in artificially decalcified enamel to be adsorbed rather than present as a discrete secondary orthophosphate.
D000818:Animals; D002417:Cattle; D003461:Crystallography; D003743:Dental Enamel / Q000187:drug effects / Q000378:metabolism*; D004164:Diphosphonates; D005459:Fluorides / Q000378:metabolism*; D007773:Lactates; D010710:Phosphates / Q000378:metabolism; D010756:Phosphoric Acids / Q000378:metabolism / Q000494:pharmacology*; D012969:Sodium Fluoride / Q000378:metabolism; D013055:Spectrophotometry, Infrared; D014100:Toothpastes
D004164:Diphosphonates; D007773:Lactates; D010710:Phosphates; D010756:Phosphoric Acids; D014100:Toothpastes; C012980:fluorophosphate; C029285:hydroxymethanediphosphonic acid; D012969:Sodium Fluoride; D005459:Fluorides