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In all the patients treated, the characteristics of the ultrasonic frequencies allowed rapid and easy intraoperative management, without any visible injury to the adjacent soft tissue. No side effects were detected.

The piezoelectric device is a new and revolutionary bony scalpel using the microvibrations at ultrasonic frequency so that soft tissue will not be damaged even on accidental contact with the cutting tip; this renders the piezoelectric device ideal for otologic bone surgery.

Piezosurgery proved effective in sclerotic and pneumatic mastoid. This approach results in significantly less operative blood loss and better visibility in the surgical field compared with conventional methods. Its safety as regards soft tissues was confirmed: no side effects were detected during unintentional contact with the nerve. All patients presented a complete recovery from facial paralysis at the last follow-up.