Mandibular incisors with two canals are associated with the presence of the distolingual root in mandibular first molars: a cone-beam computed tomographic study

Table 4 Distribution of DLR of mandibular first molar according to canal system of mandibular incisors on the same side

	Non-DLR	DLR	Total	p* value	Odds ratio (p**)
Mandibular first molar, left
Lateral incisor, left
Single-canal	81 (54.0%)	14 (9.3%)	95 (63.3%)	< 0.001	3.86 (0.001)
Two-canal	33 (41.8%)	22 (14.7%)	55 (36.7%)
Central incisor, left
Single-canal	102 (68.0%)	24 (16.0%)	126 (84.0%)	0.001	4.25 (0.002)
Two-canal	12 (8.0%)	12 (8.0%)	24 (16.0%)
Total	114 (76.0%)	36 (24.0%)	150 (100%)
Mandibular first molar, right
Lateral incisor, right
Single-canal	77 (51.3%)	20 (13.3%)	97 (64.7%)	0.001	3.44 (0.001)
Two-canal	28 (18.7%)	25 (16.7%)	53 (35.3)
Central incisor, right
Single-canal	95 (63.3%)	32 (21.3%)	127 (84.7%)	0.003	3.86 (0.004)
Two-canal	10 (6.7%)	13 (8.7%)	23 (15.3%)
Total	105 (70.0%)	45 (30.0%)	150 (100%)

p* value obtained using Chi-square test. p** value and odds ratio obtained binary logistic regression The level of statistical significance was set at p < .05

ISSN: 1472-6831