Retreatment with Nickel-Titanium Rotary Instruments

Nickel-titanium rotary instrument systems are used widely in endodontic practice. The clinical success of these systems have been shown in many studies. Retreatment is the one of the most challenging endodontic treatment procedures. Conventional nickel-titanium rotary instrument systems had been used for retreatment before, however problems associated with the clinical use of these systems have forced many companies to produce nickel-titanium systems specially for the retreatment. This article reviews the current nickel-titanium retreatment systems, the technical characteristics of these systems, clinical application protocol and the studies investigating these systems.