Written in English
|Other titles||Fluoroapatite reactions, Study of|
|The Physical Object|
|Number of Pages||97|
REACTIONS OF FLUORIDE ION WITH HYDROXYAPATITE BY HAROLD G. MCCANN A problem of long standing in the study of dentin and enamel is the exact nature and structure of the inorganic material in these tissues. A review of these studies from the time of Berzelius in up to has fluorapatite. If reaction with phosphate occurs somewhat. Silver doped fluorapatite nanopowders were synthesised by neutralization method, which consists of dissolving Ag 2 O in solution of HF and H 3 PO 4 and addition to suspension of Ca(OH) 2. prevention. Fluorapatite belongs to the spatial group P6 3 /m (C 6h 2) and consists of 3 ions: F-, Ca2+, PO 4 In the present paper, we have carried out a crystallographic study of the fluorapatite structure and of the changes induced by the substitutions. The fluorapatite structure and the presence of a large number of ionic bonds make. The objective of the study is to analyze the solid state reactions leading to the precipitation of fluoroapatite, Ca 5 (PO 4) 3 F, in two different functional glass-ceramic systems (labeled A and B) of interest for restorative dentistry. Combined X-ray diffraction (XRD), electron microscopy (SEM and TEM) and solid state nuclear magnetic resonance (NMR) are used to characterize the solid state.
Abstract: In the present study, a simple method of regenerating microstructure of human tooth under near-physiological conditions (pH , 37 °C, 1 atm) was developed. Commercial gelatin was used as matrix materials in this method, which nucleated the formation of fluorapatite (FA) nanocrystals and regulated the growth of nanocrystals. The principal material in the phosphate ores is composed of calcium fluorapatite Ca10(PO4)6F2, in which the various components have been partially substituted by magnesium, sodium, carbonate, and hydroxyl ions. These substitutions affect the stability of the material and its reactivity toward the acid attack. The present chapter reports the influence of carbonates and magnesium on these. Finally, the white solid of cadmium fluorapatite obtained was carefully washed using ultrapure water and dried at 70[degrees]C for 48 h. Characterization. A quantity of g of the synthetic cadmium fluorapatite (Cd-FAP) was dissolved in L of 1 M HN solution and diluted to L in a volumetric flask with ultrapure water. 3. The reaction of CaF; with primary orthophos- phate ions as the pH is increased according to the reaction CaF; + 9Ca2+ + W^O^ ^2Ca.,F(PO^ +6^ The addition of a calcium complexor will inhibit this reaction, and also reaction 4. 4. The direct precipitation of fluoroapatite on residual hydroxyapatite substrate.
A procedure is proposed for studying acid decomposition of solid materials with the use of ion-selective electrodes, with the experimental data recorded and processed with a personal computer. Variation of the H3O+, F-, and Ca2 + concentrations in reaction of fluorapatite concentrate with nitric, sulfuric, and orthophosphoric acids and also the effect of particle size on the rate of solid. Some Physical and Chemical Methods in the Study of I. Electrodeposited Nickel and II. The Dental Enamel-Fluorapatite System, Ph.D. Thesis, Indiana University, Google Scholar. Synthetically prepared maghemite and fluorapatite, characterized with BET, SEM, XRD, FT-IR, and FT-Raman, are used to investigate the protolytic properties and surface characteristics in a mixed system of maghemite and fluorapatite by means of potentiometric titrations and surface complex modeling. Titrations were performed in the pH range of − at 25 ± °C in ionic media of Search the world's most comprehensive index of full-text books. My library.