Centering Ability of a New Nickel-Titanium Rotary Instruments with a Peculiar Flat-side Design: An Study.

AIM

The aim of the present study was to investigate the role of the flat design compared with a non-flat designed instrument on the centering ability in a simulated root canal system.

MATERIALS AND METHODS

Two file systems were chosen: the F-One (Fanta Dental, Shanghai, China) and a prototype with the same design but without the flat-side design. A total of 50 simulated L-shaped root canals in resin blocks were shaped with a new instrument each. Pre- and postcanal preparation images were captured and superimposed to measure and compare the canal transportation and evaluate the centering ability of each file. The test was performed and the level of significance was set at < 0.05.

RESULTS

Prototype files removed significantly less resin from the inner and the outer parts of the canal and showed significantly higher mean transportation values.

CONCLUSION

It can be concluded that the F-One file system demonstrated better shaping ability compared with the prototype file system in L-shaped resin-simulated canals.

CLINICAL RELEVANCE

The present study showed the safety of the flat-side design, minimizing the risk of iatrogenic errors such as ledging, perforation, or zipping of the root canal.