Table 1 Definitions of reference points & planes
Reference planes | Description |
|---|---|
A. Reference planes | |
Horizontal Reference Plane (HRP) | The plane constructed by PoRt. - OrRt. - PoLt. (Frankfort plane) |
Sagittal Reference Plane (SRP) | The plane perpendicular to FH plane & passing through Na – Ba line (Midsagittal plane) |
Coronal Reference Plane (CRP) | The plane perpendicular to FH plane and Midsagittal plane passing through Na (Na - perpendicular plane) |
B. Reference points | |
Na | The most anterior point of nasofrontal suture on sagittal plane |
S | The midpoint of the fossa hypophysealis |
Ba | The midpoint on the anterior border of the foramen magnum |
FRt./FLt. | The most superior point of the (right/left) glenoid fossa |
CoRt./CoLt. | The most superior point of the (right/left) condyle |
LRt./LLt. | The most posterior point on anterior surface of (right/left) condyle |
PoRt./PoLt. | The most superior point of the (right/left) external auditory meatus |
Po’Rt./Po’Lt. | The most inferior point of the (right/left) external auditory meatus |
AmRt./AmLt. | The most inferior point of (right/left) articular eminence |
MDPRt./MDPLt. | The most medial point of (right/left) disc pole |
DDPRt./DDPLt. | The most distal point of (right/left) disc pole |
CoNRt./CoNLt. | The mid-point of (right/left) condylar neck on coronal view |
OrRt./OrLt. | The most inferior point of the (right/left) infraorbital margin |
DRt./DLt. | The intersecting point on posterior surface of condyle and Po - Am line (Right/Left) |