Fig. (1) Ultrasonic surgery device and the used tips.a. Ultrasonic device with the vibrating handpiece. Peak power is 90 W at level 9; at level 5 out of 9, power is 72 W.b. The vibrating tips that have been used to remove the necrotic bone. From above, the bone scraper tip; the straight saw to cut on the vestibular and lingual/palatal sites; the orthogonal saw to cut on the mesial and distal sites of the sequestrum; the angled round tip to smoothen the occlusal sites of the alveolar ridge after removal of the sequestrum; the long straight round tip for an easier access of the posterior area on the vestibular and lingual sides. All tips are made of titanium aluminum vanadium alloy (Ti gr 5).