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Table 2 Estimation accuracy of working length measurement closest to real values in a range of 0.5mm tolerance level recorded on CBCT and digital 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

Tolerance level   Degree of curvature Total
%
P value*
Moderate
10°–25°
Severe
26°–70°
CBCT image 0.5 mm Yes 26
60.5%
7
41.2%
33
55%
0.18**
No 17
39.5%
10
58.8%
27
45%
Digital image 0.5 mm Yes 25
48.8%
7
41.18%
32
53.3%
0.92**
No 18
51.2%
10
58.82%
28
46.7%
  1. *Chi- square test
  2. **Not significant