Plasma Sprayed HA Coatings
Technology
DOT applies the plasma sprayed HA coating to the implants in a vacuum chamber using the VPS vacuum technique.
HA Coatings - PDF: 400 KB
Range of Application
- Joint implants: hip joint, knee joint, ankle joint, shoulder joint, wrist joint, finger implants and spinal implants
Advantages of the Procedure
- Surface enlargement
- High primary stability of the implant due to rough surface
- Long-time stability due to bone ingrowth into the porous HA layer
- Improved fatigue strength of the implants compared with sintering techniques
- Application of VPS technique leads to increased purity and adhesive strength in comparison to other methods (e.g. APS - Atmospheric Plasma Spray)
Properties
- Colour: light grey/white
- Coating thickness: 70–150 µm
- Roughness Ra: 5–13 µm
- Porosity: 10–20 %
- Adhesive strength: ≥ 15 MPa
- Ca/P ratio: 1.67–1.76
- Phase composition: ≥ 85 % HA/≤ 15 % a-TCP, ß-TCP, TTCPP
- Porous, crystalline surface
- Crystallinity of the HA layer: > 65 %
- Very good biocompatibility
SEM pictures of the HA sprayed surface
BONIT®
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BONIT®-HA
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