What is the KSP for hydroxyapatite?
Table of Contents
What is the KSP for hydroxyapatite?
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.
At what pH does hydroxyapatite dissolve?
By these means, it was found7 that the solubility of HAp was only about one-hundredth of that previous reported8, 9, 10, 11, 12, 13, 14, 15 in a simple 100 mM KCl solution at pH 5.
Is calcium hydroxyapatite soluble in water?
The activity product calculated for hydroxyapatite was not constant but varied widely with the ratio of solid—water. The solubility was less when more of the solid had been dissolved. An increase in ionic strength by “spectator” ions, such as NaCl, leads to a decrease in solubility.
Where is hydroxyapatite found in the body?
bone
Hydroxyapatite is present in bone and teeth; bone is made primarily of HA crystals interspersed in a collagen matrix—65 to 70% of the mass of bone is HA. Similarly HA is 70 to 80% of the mass of dentin and enamel in teeth.
What is the density of hydroxyapatite?
3.18 g/ml
Physical and Chemical Properties
| Composition | Ca10(PO4)6(OH)2 |
|---|---|
| CAS | 1306-06-5 |
| Melting Point | 1670 C |
| Density | 3.18 g/ml |
| Molecular Weight | mol. wt. = 1004.69 |
What material is hydroxyapatite?
calcium phosphate mineral
Hydroxyapatite (HA) is a calcium phosphate mineral with the chemical formula Ca10(PO4)6(OH)2. HA-like compounds compose approximately 65% of bone, making it an appealing option for a synthetic bone composite [55].
Is hydroxyapatite and acid or base?
From the desorption process, among the species formed upon CO2 adsorption, those probing the basic sites are eliminated at quite low temperature. This underlines that the hydroxyapatite system exhibits weak basic sites.
Is N ha as good as fluoride?
In terms of restorative and preventive dentistry, nano-hydroxyapatite has significant remineralizing effects on initial enamel lesions, certainly superior to conventional fluoride, and good results on the sensitivity of the teeth.
What is the difference between hydroxyapatite and calcium phosphate?
Hydroxyapatite. Hydroxyapatite (HAP) has been widely used in bone regeneration. It is a naturally occurring form of calcium phosphate that constitutes the largest amount of inorganic components in human bones [63]. The chemical formula of HAP is Ca10(PO4)6(OH)2 with a Ca/P ratio of 1.67 [52, 64].
Can I use fluoride and hydroxyapatite?
The present study confirmed that a fluoride-free oral care gel with 15% hydroxyapatite is as effective in remineralizing initial caries lesions as a highly concentrated fluoride oral care gel with 12,500 ppm F−, and neither gel is inferior to the other with respect to remineralizing initial caries lesions.
