The piezoelectric surgery is an ultrasonic surgery which represents a novel and alternative method to the conventional hard and soft tissue management with rotating instruments in the oral district. The innovation of this technique is mainly due to three major characteristics: a) a micrometric cut of 60 mu to 200 mu, b) a selective cut which works on hard tissues but not on soft tissues, c) a relative blood free surgical field due to the air-water cavitation effect of the ultrasonic device. The final result of these characteristics is a definite clinical advantage with regard to the cut precision, the sparing of vital nervous soft tissues, the better visualisation of the surgical area. The present work shows through a series of case reports the possible use of the piezoelectric surgery in the oral district, presenting observed advantages and disadvantages over a time lag of 18 months. The entire clinical work was performed with the Piezosurgery device Mectron (Mectron Medical Technology, I-16042 Carasco).