Table 2. Analysis of mean working length (mm) comparisons between CBCT and EAL methods, as determined by the dependent t-test, showing the mean (±standard deviation) values in millimeters.

*Statistically significant

WL: working length, EAL: electronic apex locator, PA: periapical radiograph, CBCT: cone beam computed tomography

Root canal ID	Number of measured canals	Mean WL (EAL and PA radiograph)	Mean WL (CBCT)	Mean difference (EAL-CBCT)	P values
Buccal	85	21.06 (±0.24)	21.2 (±0.24)	-0.13 (±0.07)	0.058
Palatal	65	19.2 (±0.28)	19.4 (±0.29)	-0.16 (±0.07)	0.034*
Mesial	3	20.33 (±1.2)	20.44 (±1.49)	-0.4 (±0.28)	0.73
Distal	39	19.1 (±0.32)	19.06 (±0.30)	0.04 (±0.09)	0.68
Mesiobuccal	26	19.08 (±0.36)	19.05 (±0.38)	0.03 (±0.14)	0.835
Mesiolingual	13	18.84 (±0.6)	18.99 (±0.55)	-0.15 (±0.13)	0.28
Distobuccal	17	17.94 (±0.42)	16.9 (±1.13)	1.03 (±1.01)	0.32