BACKGROUND - Rotary bur is a conventionally used device for bone cutting during surgical removal of impacted molar. The use of rotary bur for bone cutting has numerous complications. To overcome these; piezosurgery was introduced. It is based on ultrasonic micro-vibration for precise cutting of the bone, without insulting the surrounding soft tissues. MATERIALS AND METHODS - 16 healthy patients with bilateral impacted mandibular third molars with similar difficulty were included in the study. 32 imp acted mandibular molars were divided (split-mouth design) into a control group(n=16) and a study group(n=16). In control group, the mandibular third molar were extracted surgically using conventional rotary bur whereas piezoelectric surgical unit was used in the study group. The duration of surgery was recorded from the point of placement of incision till the last suture. Facial measurement, mouth opening and were recorded preoperatively as baseline measurement and were noted postoperatively at fixed intervals, on 1st, 3rd and 7th day. RESULTS - The post-operative sequelae such as pain swelling and trismus were significantly high in the bur group while the duration of surgery was longer in the piezo group. CONCLUSION - Piezosurgery is superior than the conventional bur osteotomy in terms of post-operative sequelae. KEYWORDS; peizosurgery, rotary, impacted, mandibular third molar