Region Number
(sample size) 		Mean (SD)
Retromolar 255 252.38 (254.13)
Second molar - distal root 291 338.5 (234.92)
Second molar - furcation 91 383.71 (236.82)
Second molar - mesial root 252 347.31 (279.53)
First molar - distal root 640 377 (277.05)
First molar - furcation 515 379.64 (237.44)
First molar - mesial root 569 330.68 (280.22)
Second premolar 877 409.8 (252.92)
First premolar 1008 510.3 (254.21)
Canine 1094 562.76 (241.8)
Lateral incisor 1081 626.18 (309.41)
Central incisor 1086 669.26 (379.62)

CBCT = cone-beam computed tomography; HU = Hounsfield unit; SD = standard deviation.