The hydroxyapatite solubility product of human dental enamel as a function of pH in the range 4.6–7.6 at 20 °C

Larsen, Mona; Jensen, Stig Jorgo

doi:10.1016/0003-9969(89)90052-6

Cited by 42 publications

(21 citation statements)

References 25 publications

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“…While the solubility product increases by a factor of approximately 10 4 , the absolute values of solubility product are extremely low across the pH scale i.e., HAP is practically insoluble. This suggests that any changes to the apatite structure due to dissolution into solution would be negligible, which is confirmed by the identical XRD spectra recorded for all samples from pH 4.6 to 7.6 and the absence of any other calcium phosphate phases [29]. In another study, the solubility product of HAP (Ca:P ratio 1.664) was found to be constant over the pH range 4.56-9.67, although no XRD results were included [30].…”

Section: Ph Stabilitysupporting

confidence: 66%

Mechanical, pH and Thermal Stability of Mesoporous Hydroxyapatite

Kamieniak

Kelly

Banks

et al. 2017

J Inorg Organomet Polym

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Section: Ph Stabilitysupporting

confidence: 66%

Mechanical, pH and Thermal Stability of Mesoporous Hydroxyapatite

Kamieniak

Kelly

Banks

et al. 2017

J Inorg Organomet Polym

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“…10 A decrease of solubility product of dental enamel hydroxyReferences apatite 30 with a decrease in pH also could be explained as the effect of a positive adsorption mechanism be-…”

Section: Discussionmentioning

confidence: 98%

Solubility product of OH-carbonated hydroxyapatite

Ito¹,

Maekawa

Tsutsumi

et al. 1997

J. Biomed. Mater. Res.

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Information on the solubility of OH-carbonated hydroxyapatite, Ca10(PO4)6(CO3)x(OH)2-2x, previously has not been available. In the present study the solubility product (Ksp) of OH-carbonated hydroxyapatite was measured in a 0.1 M acetic acid and sodium acetate buffer solution in a pH range of 4.0-5.8 at a CO2 partial pressure of 10(-3.52) atm. The equilibrium solubility increased with the increase of carbonate content. The Ksp values decreased with the decrease of pH. For example, Ksps were 10(-119), 10(-123), and 10(-130) for pure hydroxyapatite at pH 4.9, 4.5, and 4.1, respectively. The decrease of Ksp was not accounted for by calcium-carbonate complexation. Ksp measured at isoelectric points (L) was expressed as pL = 118.65 - 0.47316 x (CO2 wt%)2.4176. From this formula, the L values were calculated for pure and fully carbonated hydroxyapatite as 10(-118.7) and 10(102.8), respectively. The L value for pure hydroxyapatite agreed with values measured under carbonate-free conditions. Therefore, the L values were regarded as the Ksp for OH-carbonated hydroxyapatite excluding errors arising from carbonate contamination in the solution.

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“…Ion activity products were calculated and the degrees of saturation were determined as described elsewhere [Larsen, 1986]. The following negative logarithms of the solubility products were used: pK.HAp 56.0 [Patel andBrown, 1975: Larsen andJensen, 1989] and pK, Ap 59.6 [McCann, 1968].…”

Section: Methodsmentioning

confidence: 99%

On the Chemical and Physical Nature of Erosions and Caries Lesions in Dental Enamel

Larsen¹

1991

Caries Res

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The aim of the present paper was to study the relation between the development of enamel erosion and caries lesion. Intact teeth were exposed to a gently agitated 50 mM acetate buffer, with or without fluoride for various periods of time. Further, intact teeth were exposed to an agitated 0.2 M HCl solution. It was found that irrespective of experimental conditions the aqueous phase was initially unsaturated with respect to both hydroxyapatite and fluorapatite during which period fluorhydroxyapatite was dissolved. Histological examination showed that the dissolving apatite originated from the enamel surface and the resulting lesion exhibited the signs of a dental erosion. The depth of the erosive lesion was found to be a direct function of the amount of mineral dissolved before the aqueous phase became saturated with respect to fluorapatite. The calcium, phosphate and fluoride dissolved made the aqueous phase first saturated and later supersaturated with respect to fluorapatite and a reuptake of fluoride in the enamel began, now under development of a caries-like lesion with preservation of the surface layer over a subsurface demineralizing zone. The demineralization depended on the volume of the aqueous phase. In conclusion, in a closed system with a limited amount of unsaturated solution a double lesion, an erosion over a caries lesion, will develop according to the changing saturation with respect to fluorapatite.

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The hydroxyapatite solubility product of human dental enamel as a function of pH in the range 4.6–7.6 at 20 °C

Cited by 42 publications

References 25 publications

Mechanical, pH and Thermal Stability of Mesoporous Hydroxyapatite

Mechanical, pH and Thermal Stability of Mesoporous Hydroxyapatite

Solubility product of OH-carbonated hydroxyapatite

On the Chemical and Physical Nature of Erosions and Caries Lesions in Dental Enamel

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