Prevalence and Morphology of C-Shaped Canals in Mandibular First and Second Molars of an Iranian Population: A Cone-Beam Computed Tomography Assessment

Table 1

Frequency of different types of C-shaped canals of mandibular first and second molars in different levels.

Type of C-shaped canal	Orifice		Coronal		Middle		Apical
	First molar	Second molar	First molar	Second molar	First molar	Second molar	First molar	Second molar
C1	2 (6.5%)	6 (19.4%)	0	3 (9.7%)	0	1 (3.2%)	0	1 (3.2%)
C2	9 (29.0%)	8 (25.8%)	11 (35.5%)	9 (29.0%)	7 (22.6%)	9 (29.0%)	4 (12.9%)	4 (12.9%)
C3	0	4 (12.9%)	0	6 (19.4%)	4 (12.9%)	7 (22.6%)	2 (6.5%)	8 (25.8%)
C4	0	2 (6.5%)	0	2 (6.5%)	0	3 (9.7%)	5 (16.1%)	7 (22.6%)
value	0.085		0.011		0.568		0.505

was considered statistically significant.