Apical transportation of ProGlider and ProTaper Next activated with different motions

Abstract

Purpose: the aim of this study was to investigate the apical transportation of the ProGlider and ProTaper Next using 3 different motions (150 degrees clockwise [CW]; 0 degrees counter clockwise [CCW], 270 degrees CW-30 degrees CCW; and [360 degrees CW] continuous rotation). Materials and methods: 36 simulated, curved, plastic training blocks were randomly distributed into 3 groups for treatment according to the movement kinematics used for ProGlider (Dentsply Maillefer) followed by ProTaper Next (Dentsply Maillefer) instruments (n = 12): 150 degrees CW-30 degrees CCW, 270 degrees CW-30 degrees CCW, and 360 degrees CW (continuous rotation). Pre- and post-instrumentation photographs were taken from the root canals in a standardized manner. Root canal transportation was calculated at 1, 2, 3, 4, and 5 mm from the apical terminus of the canal. Data were analyzed using a Kruskal-Walis H test (p =.05). Results: At the 1- and 2-mm levels, both reciprocating motions (150 degrees CW-30 degrees CCW and 270 degrees CW-30 degrees CCW) resulted in less transportation than those of continuous rotation (p<.05). However, there were no significant differences between the groups at the 3-, 4-, and 5-mm levels (p>.05). Conclusions: Both reciprocating motions were found to have less canal transportation than the continuous rotation group at the 1- and 2-mm levels. This is the first study about the use of the ProGlider and ProTaper Next activated by different motions. Reciprocating motion can be beneficial for ProGlider and ProTaper Next to reduce transportation of root canals.