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AIMThe 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 METHODSTwo 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 t test was performed and the level of significance was set at p < 0.05.RESULTSPrototype files removed significantly less resin from the inner and the outer parts of the canal and showed significantly higher mean transportation values.CONCLUSIONIt 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 RELEVANCEThe 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.

Centering Ability of a New Nickel&ndash;Titanium Rotary Instruments with a Peculiar Flat-side Design: An In Vitro Study

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