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Table 3 The mean and standard deviation (SD) values of the change in the canal curvature angles after shaping in both moderate and sever curvature groups, calculated on CBCT images

From: Root canal curvature as a prognostic factor influencing the diagnostic accuracy of radiographic working length determination and postoperative canal axis modification: an in vitro comparative study

  Moderate
10°–25°
Severe
26°–70°
P-value*
N Mean SD N Mean SD
Before instrumentation 43 21.32 4.26 17 29.95 4.143 0.688**
After instrumentation 43 18.541 4.143 17 22.84 2.693 0.1**
Curvature change 43 -12.721 10.016 17 -23.202 10.131 0.691**
  1. * Independent t test
  2. ** Not significant