Rod-shaped apatite crystals having a specific...

Details Rod-shaped apatite crystals having a specific... Rod-shaped apatite crystals having a specific...

2008-01-22

2008-01-22

Wood, Elizabeth D. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Dental

C501S001000, C423S301000, C423S308000, C424S057000, C424S602000

Reexamination Certificate

active

07320728

ABSTRACT:
The rod-shaped apatite crystals of the formula Ca5(PO4)3(OH)xFyhave the following featuresa) the length-to-breadth ratio of the crystals is at least ≧5 andb) 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.

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N. Senamaud, et al., “Calcination and sintering of hydroxyfluorapatite powders”, Solid State Ionics, v. 101-103, No. 2002, pp. 1357-1362, Nov. 1, 1997.
Database Inspec Online! The Insstitution of Electrical Engineers, Stevenage, GB; K. Kamiya, et al., “Effects of the addition of F/sub -/ ions on the properties of fibrous hydroxyapetite grown in the gel system”. Database accession No. 3584777 XP002215622 & Materials Research Bulletin, Jan. 1990, USA, v. 25, No. 1, pp. 63-70, ISSN: 0025-5408.

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