Determination of the calcium fluoride formed from in vitro exposure of human enamel to fluoride solutions
| Autor: | E.C. Moreno, V. Caslavska, F. Brudevold |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
Scanning electron microscope
Surface Properties Inorganic chemistry chemistry.chemical_element Acidulated Phosphate Fluoride chemistry.chemical_compound Fluorides Apatites parasitic diseases Hydroxides Humans Fluorides Topical Solubility Dental Enamel General Dentistry Dissolution Electrodes Enamel paint Spectrophotometry Atomic Fluorapatite Phosphorus Cell Biology General Medicine Hypochlorous Acid Calcium Fluoride Otorhinolaryngology chemistry Spectrophotometry visual_art visual_art.visual_art_medium Fluorine Potassium Calcium Fluoride Nuclear chemistry |
| Zdroj: | Archives of oral biology. 20(5-6) |
| ISSN: | 0003-9969 |
| Popis: | Equilibration in 1M KOH for 24 hr of from 0.6 to 30 μg ml−1 of CaF2 and different amounts of fluorapatite resulted in dissolution of the CaF2 while the fluorapatite remained intact. CaF2 was also selectively dissolved from mixtures of CaF2 and pre-fluoridated powdered human enamel. No fluoride was dissolved from blocks of intact enamel treated in 10 ml of KOH for 24 hr, but most of the fluoride deposited from topical treatments was lost by this treatment. Findings on enamel blocks treated with topical solutions of acidulated phosphate fluoride and NH4F showed that the fluoride retained after exposure to KOH was not related to the initial uptake. Scanning electron microscopic examinations of F-treated enamel surfaces verified the removal of CaF2 by KOH. The concentrations of Ca, P and F in the KOH solution after equilibration with different amounts of CaF2, hydroxyapatite and fluorapatite showed that rapid release of F and Ca from CaF2 depressed dissolution of the apatites, and that the system was governed by the solubility products of CaF2 and Ca(OH)2. It is concluded that 1M KOH can be used for the assessment of the CaF2 formed from topical treatments in in vitro systems. |
| Databáze: | OpenAIRE |
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