ROD SHAPED APATITE CRYSTALS WITH A SPECIFIC LENGTH-TO-WIDTH RATIO

摘要

The invention relates to rod-shaped apatite crystals of formula Ca5(PO4)3(OH)xFy, comprising the following characteristics: a) the length-to - width-ratio of the crystal is at least >= 5 and b) x + y represent 1, in the case where x or y 0, the total amount of the crystals exist as single hydroxylapatite crystals and fluorapatite crystals and/or as a mixture of mixed crystals, whereby in relation to the total amount of the crystals, (1 - x). 100 % of the hydroxidions are replaced by fluoridions in the case where y = 0. The invention also relates to dispersions which contain said rod-shaped apatite crystals, in addition to a method for producing said dispersions or apatite crystals.