Preoperative Estimation of Endodontic Working Length with Cone-Beam Computed Tomography and Standardized Paralleling Technique in comparison to Its Real Length

Table 2

Measurement reproducibility in digital paralleling radiography and CBCT scan closest to the real values, in a range of 0.5 mm and 1 mm.

		Curvature	Total	value
Accurate estimation		Moderate	Severe
CBCT (0.5 mm)	Yes	26 (60.5%)	7 (41.2%)	33 (55%)	0.18
	No	17 (39.5%)	10 (58.8%)	27 (45%)
CBCT (1 mm)	Yes	42 (97.7%)	16 (94.1%)	58 (96.7%)	0.49
	No	1 (2.3%)	1 (5.9%)	2 (3.3%)
Paralleling technique (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%)
Paralleling technique (1 mm)	Yes	36 (83.72%)	15 (88.2%)	51 (85%)	0.85
	No	7 (16.28%)	2 (11.8%)	9 (15%)

Chi-square test. Not significant.