Surface Treatments

Application-Specific. Individual. Diverse. 

Today, medical implants must comply with numerous requirements: rapid as possible ingrowth, prevention of bacterial colony formation, increasing biocompatibility, trouble-free explantation after a few months, color-coding, etc. All these criteria can no longer just be met by material selection alone, surface finishing has become a decisive factor for success!

Cendres+Métaux offers the following abrading surface processes in-house:

  • Pressure and injector blasting
  • Structural etching and passivating
  • Anodizing of titanium
  • Polishing and grinding
  • Laser marking

Do you have questions on the individual processes or do you require additional information? Do not hesitate to contact us.

Pressure and injector blasting

The surface treatment of implants to increase the biologically active surface has asserted itself specifically in implant dentistry as basis for good osseointegration. To this end, the implants are first blasted. Two methods are available: pressure and injector blasting.

In injector blasting, the blasting material impacts the items to be processed in a repeated cycle at negative pressure, whereas in pressure blasting, the blasting medium is blasted via a pressure vessel at high force. Once the pressure vessel is empty, it needs to be refilled. This requires a short interruption to the process, however, the advantage is that the single-use of the blasting material assures uniform quality of the blasting material in terms of purity and grain size.

Titanium surfaces can be blasted with various material particles for roughening. Depending on the particle size and the pressure, this allows achieving different surface topographies. The most commonly used materials for blasting particles in the medical field are aluminium oxide, titanium oxide or calcium phosphate.

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Structural etching and passivating

A fine microscopic roughened surface is of advantage in medical implants intended for osseointegration. A sophisticated etching technology results in reproducible, ultra-fine structures which can be clearly separated from areas not to be processed, even for complicated geometries.

Passivating processes create a metallic clean surface on various base materials. Following this chemical treatment, no potential reaction partners continue to be present, the material remains inert in the body.

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Anodizing of titanium

Visual differentiation increases the general safety, in particular for small titanium components. Color-anodizing allows the quick and safe identification of parts without using third party material: the naturally present oxide layer is reinforced through electrolysis in a controlled manner. The thus achieved interferences create a broad color spectrum on the surface, which can be defined and confined without the use of pigments or third party coatings.

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Polishing and grinding

Visual as well as functional requirements for medical devices often require surface finishing. A wide range of machines and abrasives allows us to accommodate specific customer requirements. We can make your products shine using a variety of dry or wet chemical vibratory finishing processes.

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Laser marking

To increase the safety of medical devices, a variety of identification characteristics can be applied to the assembly components. This ranges from orientation aids via item designations to batch numbers. The contact-free material abrasion is minimal, the process is safe and fast. The most commonly used materials are precious metals, steel or titanium.

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