iajabmsIAJABMSIAJABMS2709-3298https://doi.org/10.47310/iajabms.2021.v02i01.015Study Concerning the Cyclical Fatigue of Endodontic Instruments of the Reciproc SystemSauloValença de FariasBarbosaLucianoBarretoSilvaPauloMaurício Reis de MeloJúniorIn routine endodontic practice, attempts are made to reach a file system for biochemical preparation of the root canals which provides better conditions for the irrigating solution to clean and disinfect the root canals, trying as much as possible to preserve the quality of the preparation. The root canal shaping time has been drastically decreased with the aid of mechanized instrumentation, especially with the reciprocal movement of a single file, providing much more comfort for the patient as for the professionals involved in the process. Nevertheless, the concern with the capacity to withstand cyclic fatigue still remains, since once within the root canals all instruments may be prone to fracture. This study aimed to review the current literature concerning the cyclic fatigue of endodontic instruments in the Reciproc system. For the accomplishment of this work, PubMed database was used, and the set of cyclic fatigue descriptors as well, namely: Reciproc, NiTi and their similars, only in English. The readings of the abstracts were conducted according to the inclusion criteria, which was the gathering of the journals which carried out experimental studies in vitro, with instruments belonging to the Reciproc system, from the periods ranging from 2012 and 2019. It was concluded that the reciprocating instruments from Reciproc System (VDW, Munich, Germany) that presented the best performance quality, after scrutinizing several aspects, was the Reciproc Blue R25 instrument (25/0.8).