Canal Central Ability of Four Different Endodontic Single-File Systems in Simulated L-Shaped Resin Canals

The aim of the present study was to compare the canal central ability of four different single-file instruments: WaveOne (Dentsply Maillefer), Reciproc (VDW), One Shape (Micro Mega) and F360 (Komet). Sixty-four L- shaped canals in resin blocks were instrumented to an apical end using one of the four single-file instruments (size 25) described above (each group, n=16). Preoperative and postoperative images were obtained with a digital camera and superimposed in 2distinctive layers. The amount of resin removed from both the inner and the outer sides of the canal was measured at five different sites: the orifice; the half way of the orifice; the beginning of the curve; the apex of the curve; and the apical end. The amount of resin removed by each instrument was measured using image analysis software. The resin removal was statistically analyzed using a paired t-test, analysis of variance, and Tukey's post hoc test. The WaveOne and Reciproc instruments both removed significantly more amounts of resin from the inner side at the beginning and apex of the curve (P <0.05). Canals prepared with the F360 and One Shape instruments were more centered in their cutting compared with the Reciproc and WaveOne instruments. All the investigated single-file instruments effectively and safely prepared the simulated canals. Instruments with less taper like F360 and One Shape preserve canal anatomy to a greater extent than larger taper instruments.