Shaping Force and Torque Values during Canal Shaping using XP Shaper and OneCurve Systems

Abstract Background The aim of this in vitro study was to evaluate the magnitude of shaping forces and dynamic torques developed with XP shaper (XPS) and OneCurve (OC) systems during canal shaping of extracted teeth.Methods Thirty-two single-canalled mandibular premolars were divided into two groups: XPS and OC (n=16 each). In XPS and OC, the canals were shaped with their dedicated file inserted three times until it reached the canal length. The experiment was performed while the test sample was surrounded by water under controlled simulated intracanal temperature. The real-time shaping forces and torques induced during canal shaping were observed. The inward and outward peak shaping forces and the peak torques were recorded and used for statistical analysis by using the Mann-Whitney test. The statistical significance was set at 5%.Results In both groups, the developed shaping forces in both directions and the torques increased with the successive file insertions. The inward and outward peak forces of the XPS and OC groups ranged from 0.33 to 3.12 N and from 0.09 to 1.96 N, respectively. The peak torque developed in both groups ranged from 0.12 to 1.52 N.cm. In the three insertions, the XPS showed significantly lower peak forces in both directions (P=0.00). For the peak torque, XPS had significantly lower values in all the insertions (P=0.00).Conclusions The XPS system had significantly lower shaping forces and lower dynamic torque values during canal shaping compared with the OC system.