A review of the latest developments in rotary NiTi technology and root canal preparation

Abstract

The introduction of nickel‐titanium (NiTi) mechanical instruments dramatically changed clinical endodontics over the last few decades. Before NiTi, it was necessary to use more instruments to create an ideal root canal shape, and many approaches, sequences and techniques were developed over the years. Recently, NiTi endodontic instruments have undergone a series of changes brought about by modifications in design, surface treatments, and thermal treatments to improve their root canal preparation outcomes and reduce associated canal preparation risks during root canal treatment. Heat treatment is one of the most fundamental approaches to improving the fatigue resistance and flexibility of NiTi endodontic instruments. In addition, new kinematics have been developed to offer greater safety and efficiency. This narrative review describes the general properties and manufacturing of NiTi instruments, and the mechanical system evolution of NiTi instruments.

Root Canal Instrumentation: Current Trends and Future Perspectives

“…The primary cause of instrument fracture still stems from continuous rotational movement. To effectively mitigate the risk of torsional fracture, an alternative approach involving an alternating clockwise and counter-clockwise movement with varying angles, known as reciprocating movement, has been reintroduced in recent years [36]. Modern reciprocation involves a combined movement that includes a cutting phase in one direction of rotation, immediately followed by a phase where the instrument engages in the opposite rotational movement.…”

Local Elements Content on Working Surfaces of Five Different New Ni-Ti Rotary Endodontic Files: SEM-EDS Study

“…Ni-Ti rotary instruments have changed workflow of endodontic treatment by optimizing clinical process, decreasing number of needed files and improving outcome of interventions provided within root canals [1][2][3]. Nowadays development of Ni-Ti rotary files has not stopped and still ongoing, while including improvements within their mechanical and metallurgical characteristics [4]. Gambarini et al highlighted that novel strategy of Ni-Ti files development focused over improved approaches of their thermomechanical processing [5].…”

Avaliação da região apical do sistema de canais radiculares

“…Previous studies that evaluated the root canal anatomy used various methods, including histological sectioning, clearing techniques and radiological examination (De . In endodontics, microcomputed tomography (micro-CT) has frequently been used as reference standard due to a high spatial resolution, which allows the evaluation of teeth's fine anatomical details without destruction of the sample; however, this imaging method can only be used for research purposes because of high radiation dose (Grande et al 2012, Zuolo et al 2016, Zhang et al 2017, Kales & Keskin 2018. To date, resources available for clinical use consist of periapical radiography and cone-beam computed tomography (CBCT).…”