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Table 1 Definitions of the cephalometric variables investigated in this study

From: Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion

Variable

Definition

SNA(°)

the sagittal relationship of the maxilla to the cranial base

SNB(°)

the sagittal relationship of the mandible to the cranial base

ANB(°)

the sagittal relationship between the maxilla and mandible relative to the cranial base

U1-NA(°)

the angle between the long axis of the upper central incisor and the NA line

SN-OP(°)

the angle between the cranial base and the occlusal plane

L1-NB(°)

the angle between the long axis of the lower central incisor and the NB line

U1-L1(°)

the angle between the long axis of the upper central incisor and the long axis of the lower central incisor

U1-SN(°)

the angle between the long axis of the upper central incisor and the cranial base

MP-SN(°)

the angle between the mandibular plane and the cranial base

FH-MP(°)

the angle between the mandibular plane and the Frankfort plane

MIA(°)

the angle between the MA and IA; MA:the long axis of the mandibular symphysis; IA:the long axis of the lower central incisor; when the IA is to the labial side of the MA, the MIA is a positive value

IMPA(°)

the angle between the long axis of the lower central incisor and the mandibular plane