Prevalence and Management of Instrument Fracture in the Postgraduate Endodontic Program at the Dental School of Athens: A Five-year Retrospective Clinical Study

Defects in Nickel-Titanium Instruments after Clinical Use. Part 3: A 4-Year Retrospective Study from an Undergraduate Clinic

“…A small number of studies have focused on NiTi instruments coming from postgraduate endodontic programs (4,14). The mean clinical fracture frequency of NiTi rotary instruments is approximately 1.0%, with a range of 0.4% to 3.7% (2, 18 -21).…”

“…This benefits both experienced and inexperienced operators (1)(2)(3)(4). Some surveys in dental schools showed that the perception of students using NiTi rotary instruments was positive in the majority of dental facilities.…”

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

“…They are increasingly used by generalists and specialists to facilitate the cleaning and shaping of root canals. Despite their undeniably favorable qualities, there is a potential risk of ''unexpected'' fracture with NiTi instruments (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). Even though there have been considerable improvements in the file design and manufacturing methods on endodontic rotary instruments made of NiTi alloys, rotary instrument intracanal separation caused by cyclic fatigue remains a concern, especially in root canals with severe curvatures (11)(12)(13)(14)(15)(16).…”

Removal of Broken Files from Root Canals by Using Ultrasonic Techniques Combined with Dental Microscope: A Retrospective Analysis of Treatment Outcome

“…Retrieval or bypass of the fractured instruments in the apical third was less successful (37). The deeper the instrument was located at the root canal, the greater the risk of perforation was (20).…”