Fig. 2

Ultrasonic tips in the set-up, before use and after use. Instrument tips within the experimental set-up (left column) and at high magnification before and after instrumentation. a steel („used“ after 40 × 3 cycles), b PEEK („used“ after 2 × 3 cycles), c titanium („used“ after 4 × 4 cycles), d carbon(„used“ after 2 × 3 cycles), e resin („used“ after 1 × 3 cycles)