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 5

Comparison between Korean and Han nationality in terms of the shortest distance between the mandibular canal and the root tip of MTM in different types of impaction (n (%)).

	Korean nationality	Han nationality	Z
Below the root
Vertical	0 (0–1.940)	0.330 (0–2.640)	−0.632	0.527
Mesial	0 (0–1.830)	0 (0–0)	−1.581	0.114
Horizontal	0 (0–1.000)	0 (0–1.740)	−1.537	0.124
Buccal side
Vertical	1.090 (0–4.350)	0 (0–1.915)	−0.685	0.493
Mesial	0 (0–0.370)	0 (0–2.150)	−2.029	0.042
Horizontal	0 (0–0)	1.090 (0–3.030)	−2.647	0.008

Note. means statistical significance.