Fully Dense Rod-Like Hydroxyapatite

Hydroxyapatite (HA) whiskers—also referred to as HAp whiskers or hydroxylapatite whiskers—are elongated, rod-like particles composed of pure synthetic hydroxyapatite. Characterized by their high aspect ratio and directional crystallinity, these whiskers offer distinct advantages over spherical or granular HA particles, particularly when used in hard tissue scaffolds or composite systems.

Their incorporation into advanced orthopedic and dental materials allows engineers to enhance both the mechanical strength and biological performance of implantable devices. Within composites, dense HA whiskers improve load transfer, reinforce structural integrity, and promote osteoconductivity—key factors in achieving stable, long-term integration with surrounding bone.

Key characteristics of HA whiskers include:

• High aspect ratio

• Single-crystal structure

• Surface bioactivity

• Phase purity

• Customizable dimensions

• Transparency under light microscopy