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 4

Comparison between Korean and Han nationality in terms of the relative positional relationship between the mandibular canal and MTM in different impaction types (n (%)).

	Korean nationality	Han nationality	χ^2/Fisher
Vertical
Below the root	19 (55.9)	16 (38.1)	2.393	0.122
Buccal side	7 (20.6)	16 (38.1)	2.729	0.099
Lingual side	7 (20.6)	8 (19.0)	0.028	0.867
Between roots	1 (2.9)	2 (4.8)	—	1.000
Mesial
Below the root	39 (41.5)	23 (28.7)	3.058	0.080
Buccal side	24 (25.5)	31 (38.8)	3.493	0.062
Lingual side	10 (10.6)	18 (22.5)	4.504	0.034
Between roots	21 (22.3)	8 (10.0)	4.739	0.029
Horizontal
Below the root	43 (61.4)	48 (60.0)	0.032	0.858
Buccal side	11 (15.7)	21 (26.3)	2.469	0.116
Lingual side	8 (11.4)	10 (12.5)	0.041	0.840
Between roots	8 (11.4)	1 (1.3)	6.858	0.009

Note. means statistical significance.