Shaping ability of ProTaper gold and WaveOne gold nickel-titanium rotary file in different canal configurations

Objective: This study compared the shaping ability of the ProTaper Gold (PTG) and WaveOne Gold (WOG) systems in simulated L-and S-shaped root canals. Materials and Methods: Forty L-and S-shaped root canals in resin blocks were randomly divided into four groups ( n = 10). Each canal was prepared to the standard working length (16 mm) and enlarged to an apical size 25 using PTG set of files in the sequence S1, S2, F1, and F2 at a speed of 300 rpm and a torque of 2.5 N cm until each file reached the working length. For WOG, primary file was used in a reciprocating motion until the working length was achieved. The canals were photographed before and after instrumentation using different colors. The two images were superimposed, five points were selected, and canal widths were measured with image analysis software. The preparation time, instrument failure, and presence of aberrations were noted and compared between systems. Results: Findings revealed a highly significant difference ( P < 0.001) in preparation time between instruments. A total of nine aberrations in the danger zones of PTG/L-shaped (1), PTG/S-shaped (4), WOG/L-shaped (1), and WOG/S-shaped (3), canals were noted. WOG/L-shaped canals were wider at the canal orifice than PTG/L-shaped canals ( P < 0.05), but PTG use resulted in a greater width at the halfway point of the straight section and the beginning of the curve than WOG ( P < 0.05). PTG/S-shaped root canals were wider at the beginning of the first curve of the prepared canal ( P < 0.05). Conclusions: The WOG system demonstrated better shaping ability, fewer canal aberrations, and more rapid preparation than the PTG system. All files straightened the curvature of multicurved canals in the apical region.