ISO 5832-3 Ti6Al4V ELI For Surgical Implants

The selection of materials for medical devices is based on mechanical properties, chemical composition and biocompatibility. Technical Standard ASTM F-136/ISO 5832-3 covers the mechanical properties and chemical composition requirements for Ti Grade 23 (Ti–6Al–4V ELI, extra low interstitial) alloy to be used in the manufacture of surgical implants.

Currently, dental implant manufacturers use commercially pure titanium (Ti G2 and Ti G4) and Ti–6Al–4V alloy (Ti G5) with a surface treatment in order to optimize the contact between bone cells and the device. This interaction between bone cells and dental implants surfaces is called osseointegration.

However, Ti G2 and Ti G4 are not used in medical applications that involve high stresses, such as orthopedic prostheses and narrow dental implants. For orthopedic applications, Cr–Co, stainless steel and Ti G5 (Ti–6Al–4V alloy) is the preferred choice due to their high mechanical resistance. These alloys ensure load transmission to bone tissues over a long time, which is necessary when damaged hard tissues are replaced by prostheses.

Ti–6Al–4V ELI alloy has good mechanical properties, but exhibits a possibly toxic effect from released vanadium and aluminum. For this reason, vanadium and aluminum-free Ti-based alloys have been proposed for biomedical applications.

ISO 5832-3 Ti6Al4V/Ti6Al4V ELI Chemical composition

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