Rod shaped apatite crystals with a specific length-to-width ratio
OwnerRalf Nörenberg, Hans-Josef Sterzel +1inventors
InventorsRalf Nörenberg, Hans-Josef Sterzel, Volker Koch
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Abstract
The rod-shaped apatite crystals of the formula Ca5(PO4)3(OH)xFy have the following features a) the length-to-breadth ratio of the crystals is at least ≧5 and b) x+y=1, where if x or y≠0 the total amount of the crystals is present as a mixture of individual hydroxyapatite crystals and fluoroapatite crystals and/or as mixed crystals, such that, based on the total amount of the crystals, (1−x)·100% of the hydroxide ions present if y=0 are replaced by fluoride ions. The invention furthermore describes dispersions which contain such rod-shaped apatite crystals, and a process for the preparation of the dispersions or of the apatite crystals.
Claims13
A rod-shaped apatite crystal of the formula Ca5(PO4)3(OH)xFy, wherein
- a) the length-to-breadth ratio of the crystals is at least ≧5 and
- b) x+y=1, where if x or y≠0 the total amount of the crystals is present as a mixture of individual hydroxyapatite crystals and fluoroapatite crystals and/or as mixed crystals, such that, based on the total amount of the crystals, (1−x) 100% of the hydroxide ions present if y=0 are replaced by fluoride ions.
Dependencies are inferred from the claim text.