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Table 1 Median values for torque and maximum torque reached during mesial root canal preparation using WOGP and RBR25 files

From: Analysis of reciprocating system real-time torque variation during root canal preparation

Instrument Third Median of torque Ncm (min–max) Median of maximum torque Ncm (min–max) Time (s)
WOGP Cervical 0.22 (0.20–0.25) 0.30 (0.30–0.30)A,a 53.5 (21–106)
Middle 0.20 (0.10–0.80) 0.55 (0.10–1.40)A,b
Apical 0.30 (0.10–0.65) 0.95 (0.20–1.90)B,c
RBR25 Cervical 0.15 (0.10–0.60) 0.50 (0.30–0.60)A,a 61.5 (20–107)
Middle 0.20 (0.10–0.80) 0.60 (0.10–1.30)A,b
Apical 0.30 (0.10–0.60) 1.25 (0.40–2.20)B,d
  1. Different letters indicate statistically significant differences (p < 0.05). Capital letters indicate comparisons between thirds using the same instrument (intragroup analysis). Lowercase letters indicate paired comparisons between instruments in the same third (intergroup analysis)