Under the name of DOTimplantSOURCE we are providing integrated outsourcing solutions for Original Equipment Manufacturers and distributors of medical implants and associated instruments... Read more
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Type II Anodisation (DOTIZE®)
The main effects of type II anodising are a decrease in the cold welding, an improvement in the fatigue strength and an increase in the abrasion and corrosion resistance of osteosynthesis products.
Furthermore anodising can decrease protein adsorption during the immediate post operative interaction process between the blood and the implant surface, thereby reducing the adherence of osteoblasts and suppressing the subsequent bone growth onto the implant. This effect reduces the complications related to the removal of trauma implants (e. g. bone nails and -screws).
The DOTIZE® anodising procedure, developed by DOT, replaces the thin natural oxide film present at the implant surface by a thick oxide layer. This is achieved through a spark discharge produced on the surface of the implant whilst it is immersed in an electrolytic bath containing a strong alkaline solution. This discharge melts the implant surface and the oxide layer becomes an integral part of the base material.
The implant dimensions are not changed by the surface treatment. Micro- pores and -cracks in the base material are reduced by the procedure. The DOTIZE® procedure conforms to the standard AMS 2488 (Aerospace Material Specification).
- Coating thickness: max. 5 µm
- Hardened titanium surface
- Reduction of protein adsorption up to 19 %
- Increased resistance to wear compared with untreated titanium alloys
- Good biocompatibility
- Increase of up to 15 % in the fatigue strength compared with untreated base material
- Significant reduction of release of aluminium- and vanadium ions
- no significant changes in implant dimensions
Range of Application
The DOTIZE® procedure is qualified for traumatological implants (bone screws, bone nails etc), which should be removed after a defined time and therefore should not be integrated into bone tissue.
Advantages of the Procedure
- Easier removal of the implants after fracture healing
- Improved fatigue strength of the implants
- Reduction of the risk of cold welding
- Higher pre- loading of threaded connections is possible
- Reduction of the inflammation and allergy risk by reducing the release of aluminium and vanadium ions
- Improves identifiability when compared to stainless steel
Titanium Anodisation [pdf, 4,1MB]