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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

Ā 

Moderate

10Ā°ā€“25Ā°

Severe

26Ā°ā€“70Ā°

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

āˆ’ 16.82

7.71

17

āˆ’ 18.82

5.76

0.388***

  1. *Independent t test
  2. **Significant
  3. ***Not significant