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 |