A B C P-value
Buccal wall thickness (mm) 1 (0.77) 0.61 (0.24) 0.51 (0.32) 0.936
Buccal wall bone density
(CBCT-HU) 		571.20 (337.12) 541.28 (221.07) 536.71 (207.55) 0.125
Superior wall thickness (mm) 1.34 (0.41) 0.57 (0.23) 0.50 (0.27) 0.824
Superior wall bone density
(CBCT-HU) 		591.18 (301.89) 561.07 (241.19) 553.36 (207.19) 0.069
Lingual wall thickness (mm) 0.69 (0.29) 0.55 (0.25) 0.44 (0.16) 0.001a
Lingual wall bone density
(CBCT-HU) 		662.73 (207.33) 629.27 (198.27) 611.37 (190.75) 0.045a
Apico-coronal diameter (mm) 2.92 (0.63) 2.77 (0.7) 3.06 (0.77) 0.178
Bucco-lingual diameter (mm) 2.23 (0.47) 2.25 (0.54) 2.47 (0.69) 0.198

aP < 0.05 significant differences between subgroups according to One-Way ANOVA tests.
A = the occlusal plane of the impacted tooth is at the same level as the occlusal plane of the second molar.
B = the occlusal plane of the impacted tooth is between the occlusal plane and the cervical margin of the second molar.
C = the impacted tooth is below the cervical margin of the second molar.
CBCT = cone-beam computed tomography; HU = Hounsfield units.