[Fretting in modular design implant systems]

Fretting is a problem of load-bearing implants (hip, knee) especially when modular in design and employing different materials. In contrast, fretting has not yet been observed in dental implants. In the case of ceramic femoral heads and cups (e.g. BIOLOX) no problems with fretting have so far been reported. The state-of-the-art is discussed and assessed.