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Table 4 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 digital periapical radiographic 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*
No. Mean SD No. Mean SD
Before instrumentation 43 18.24 4.06 17 28.85 2.13 0.013**
After instrumentation 43 15.62 3.82 17 24.75 2.14 0.023**
Curvature change 43 − 16.82 7.71 17 − 18.82 5.76 0.388***
  1. *Independent t test
  2. **Significant
  3. ***Not significant