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 3

Comparison between Korean and Han nationality in terms of the positional relationship between the mandibular canal and MTM and the rate of cortical bone disruption (n (%)).

	Korean nationality	Han nationality	χ^2
Positional relationship
Below the root	107 (51.4)	94 (44.1)	2.254	0.133
Buccal side	43 (20.7)	70 (32.9)	7.964	0.005
Lingual side	28 (13.5)	38 (17.8)	1.526	0.217
Between roots	30 (14.4)	11 (5.2)	10.263	0.001
Cortical bone disruption rate
Below the root	43 (40.2)	35 (37.2)	0.184	0.668
Buccal side	19 (44.2)	22 (31.4)	1.875	0.171
Lingual side	25 (89.3)	37 (97.4)	—	0.304
Between roots	29 (96.7)	9 (81.8)	—	0.170

Note. means statistical significance.