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Aiming to help clinicians choose the best instrument system for the specific endodontic case, researchers from Wuhan University in China have assessed the shaping ability of three different NiTi rotary systems. (Photograph: Radu Bercan/Shutterstock)
0 Comments Feb 14, 2017 | News Asia Pacific

NiTi rotary instrument with reciprocating motion stands out in Chinese study

Post a comment by Dental Tribune International

WUHAN, China: Using a rotary instrument that is most effective in preparing the root canal is crucial for successful endodontic treatment. In an evaluation of the shaping abilities of three nickel–titanium (NiTi) rotary systems, a team of Chinese researchers has found that a single-file system with a reciprocating motion produced the greatest volumetric change in the apical third of the canal. In addition, the system had the fastest canal preparation time of the three systems tested.

The systems analysed in the study were ProTaper Universal (Dentsply Sirona), the RECIPROC single-file system (VDW) and the K3XF rotary system (Kerr Dental). To evaluate the shaping characteristics of each system, the researchers simulated 30 root canals with a curvature of 60° in a clear resin block (Endo Training Bloc, Dentsply Sirona). The canals had a 16.5 mm length and a 10 mm straight section before the curve. Each block was randomly assigned to one of the three instrument groups.

The researchers then used micro-computed tomography for 3-D evaluation of the instruments’ shaping ability, canal transportation, volumetric change and centring ability, as well as the basic geometric parameters of the tooth’s internal morphology.

They found that RECIPROC produced enhanced apical volumetric changes in the canals, compared with ProTaper Universal and K3XF. The K3XF system, in contrast, exhibited less transportation and better centring ability at 2 and 3 mm from the apical foramen than the other two systems. However, there were no significant differences in the centring ratio and transportation between ProTaper Universal and RECIPROC.

Although the canal preparation time was the shortest with RECIPROC, this may have been because, being a single-file system, the instrument generally requires less instrumentation time, the researchers pointed out. Overall, all of the files shaped the simulated canals without any significant shaping error, they concluded.

The study, titled “A comparison of the shaping ability of three nickel-titanium rotary instruments: A micro-computed tomography study via a contrast radiopaque technique in vitro”, was published online on 9 January in the BMC Oral Health journal.

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