During the past few decades, endodontic treatment has benefited from the development of new techniques and equipments, which have improved the outcome and predictability of the treatment. Important attributes in equipments, materials and techniques such as operating microscope and ultrasonic instruments have found indispensable applications in a number of dental procedures in periodontology, to a much lesser extent in restorative dentistry, while being very prominently used in endodontics. Ultrasonic in endodontics has enhanced the quality of treatment and represents an important adjunct in the treatment of difficult cases. Since its introduction, ultrasonic has become increasingly more useful in applications such as gaining access to canal openings, cleaning and shaping, obturation of root canals, removal of intracanal materials and obstructions and endodontic surgery.