Cone-Beam Computed Tomography Analysis on the Relationship between the Mandibular Third Molar and the Position of the Mandibular Canal in Koreans from the Yanbian Area and the Han People

Table 7

Ordered logistic regression analysis results of different nationalities, impaction type, depth, number of roots, and cortical bone state.

Features			Cortical bone state
			Cortical bone is intact without contact	Cortical bone is intact with contact	Cortical bone disruption
Nationality		Han	69	41	103		1
		Korean	53	39	116	0.094	1.366 (0.948–1.967)
Impaction type	Vertical	Han	16	11	15		1
		Korean	13	6	15	0.678	1.194 (0.516–2.766)
	Mesial	Han	19	15	46		1
		Korean	22	16	56	0.824	1.069 (0.596–1.917)
	Horizontal	Han	33	11	36		1
		Korean	14	16	40	0.031	1.980 (1.066–3.676)
Impaction depth	High position	Han	40	15	50		1
		Korean	35	21	50	0.744	1.088 (0.654–1.811)
	Median position	Han	27	22	41		1
		Korean	16	12	44	0.068	1.749 (0.960–3.188)
	Low position	Han	2	4	12		1
		Korean	2	6	22	0.588	1.413 (0.404–4.945)
Number of roots	Single root	Han	11	10	13		1
		Korean	9	6	22	0.127	1.997 (0.821–4.857)
	Double roots	Han	54	30	82		1
		Korean	42	30	77	0.531	1.143 (0.752–1.739)
	Three roots	Han	4	1	8		1
		Korean	2	2	16	0.198	2.761 (0.589–12.944)
	Four roots	Han	0	0	0
		Korean	0	1	1		1

Note. means statistical significance.