The Fluoridation of Nonstoichiometric Calcium Hydroxyapatite. An Infrared Study

Amberg, C. H.; Luk, H. C.; Wagstaff, K. P.

doi:10.1139/v74-597

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…At all the ageing times, the prominent feature observed for wTC progressively weakened going to FTC and F10TC. According to a previous study (Amberg et al. 1974), this trend suggests that the apatite deposit on FTC and F10TC contained increasing amounts of fluoride in the lattice.…”

Section: Resultsmentioning

confidence: 54%

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Fluoride-containing nanoporous calcium-silicate MTA cements for endodontics and oral surgery: early fluorapatite formation in a phosphate-containing solution

Gandolfi

Taddei

Siboni

et al. 2011

International Endodontic Journal

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The addition of sodium fluoride accelerated apatite formation on calcium silicate cements. Fluoride-doped calcium silicate cements had higher bioactivity and earlier formation of fluorapatite. Sodium fluoride may be introduced in the formulation of mineral trioxide aggregate cements to enhance their biological behaviour. F-doped calcium silicate cements are promising bone cements for clinical endodontic use.

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Section: Resultsmentioning

confidence: 54%

“…It is well known that the fluoridation mechanism involves a hydroxyl substitution and a subsequent adjacent hydroxyl rearrangement. As a consequence, the intensity of the OH bending mode at about 630 cm −1 has been reported to decrease as the extent of fluoridation increases (Amberg et al. 1974).…”

Section: Discussionmentioning

confidence: 99%

Fluoride-containing nanoporous calcium-silicate MTA cements for endodontics and oral surgery: early fluorapatite formation in a phosphate-containing solution

Gandolfi

Taddei

Siboni

et al. 2011

International Endodontic Journal

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“…Model II Apatites of the non-stoichiometric type (non-stoichiometric in Ca, P 0 4 and OH) have been studied intensively by Amberg et al [1974] while the existence of such a ma terial in human enamel has been proposed by Arends and Davidson [1975]. We will presume in this model that in enamel H P042_ ions and strongly bound or caged water are present in the general form of non-stoichiometric apatites of the type:…”

Section: Temperature Range 150-400 °Cmentioning

confidence: 99%

“…For sound enamel we have used the for mula proposed by Amberg et al [1974] which is equivalent to formula II with x = y. Substitution of the experimental data for sound enamel, that the H P042~ ion concen tration is 6 wt°/o, formula II becomes:…”

Section: Temperature Range 150-400 °Cmentioning

confidence: 99%

Thermal Analysis Studies on Sound and Artificially Decalcified Tooth Enamel

Davidson¹,

Arends²

1977

Caries Res

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Sound and artificially decalcified enamel has been studied by dynamic and static thermal analysis. Weight losses mainly due to water release occur in 3 temperature ranges: 20–150, 150–400 and 400–550 °C. Special attention has been given to water release occurring in the range 150–400 °C. Here the weight losses for sound and carious enamel are 1.9 ± 0.3 and 4.5 ± 0.9%, respectively. Possible models for HPO₄²^–– and H₂O incorporation are discussed. The experimental thermal analysis studies, combined with infrared and X-ray data indicate that the mineral phase in sound enamel and carious enamel can be approximated by the formulae of water-containing non-stoichiometric apatites. In the temperature range 150–400 °C, the (firmly bound) H₂O content in sound and carious enamel is comparable. The significant difference in weight loss between sound and carious enamel is caused by the differences in HPO₄^2–– content.

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“…In nature, the ionic bond between Ca 2+ and OH – allows for various anionic substitutions including fluoride and carbonate. 41 Incorporation of F – into Ca-HAP has been postulated to occur by a number of mechanisms including substitution for the OH – group. 41 The ionic radius of an anion predicts whether it will fit into the crystal matrix of Ca-HAP.…”

Section: Fate Of Ca-hap Deposited In the Arterial Wall And Subsequentmentioning

confidence: 99%

Atherosclerosis: Viewing the Problem from a Different Perspective Including Possible Treatment Options

Goldberg

2011

Lipid�Insights

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This paper proposes that atherosclerosis is initiated by a signaling event that deposits calcium hydroxyapatite (Ca-HAP). This event is preceded by a loss of mechanical structure in the arterial wall. After Ca-HAP has been deposited, it is unlikely that it will be reabsorbed because the solubility product constant (K sp ) is very small, and the large stores of Ca ) ions, and it is proposed that anions associated with cholesterol ester hydrolysis and, in very small quantities, the enolate of 7-ketocholesterol could also displace the OH − of Ca-HAP, forming an ionic bond. The free energy of hydration of Ca-HAP at 310 K is most likely negative, and the ionic radii of the anions associated with the hydrolysis of cholesterol ester are compatible with the substitution. Furthermore, examination of the pathology of atherosclerotic lesions by Raman and NMR spectroscopy and confocal microscopy supports deposition of Ca-HAP associated with cholesterol. Investigating the affinity of intermediates of cholesterol hydrolysis for Ca-HAP compared to lipoproteins such as HDL, LDL, and VLDL using isothermic titration calorimetry could add proof of this concept and may lead to the development of a new class of medications targeted at the deposition of cholesterol within Ca-HAP. Treatment of acute ischemic events as a consequence of atherosclerosis with denitrogenation and oxygenation is discussed.

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The Fluoridation of Nonstoichiometric Calcium Hydroxyapatite. An Infrared Study

Cited by 16 publications

References 11 publications

Fluoride-containing nanoporous calcium-silicate MTA cements for endodontics and oral surgery: early fluorapatite formation in a phosphate-containing solution

Fluoride-containing nanoporous calcium-silicate MTA cements for endodontics and oral surgery: early fluorapatite formation in a phosphate-containing solution

Thermal Analysis Studies on Sound and Artificially Decalcified Tooth Enamel

Atherosclerosis: Viewing the Problem from a Different Perspective Including Possible Treatment Options

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