Fig. 4

Sagittal measurement items

1. Anterior joint space (AS, the shortest distance between the anterior edge of the articular fossa and the tangent point from the apex of the articular fossa to the anterior edge of the condyle); 2. Superior joint space (SS, the shortest distance from the apex of the articular fossa to the apex of the condyle); 3. Posterior joint space (RS, the shortest distance between the posterior edge of the articular fossa and the tangent point from the apex of the articular fossa to the posterior edge of the condyle); 4. Joint fossa width (FS, the distance between the lowest points of the external auditory and articular tubercle); 5. Joint fossa depth (FD, the shortest distance between the apex of the articular fossa and the line of the articular fossa); 6. Joint tubercle angle (NA, the angle between the line connecting the apex of the articular fossa and the lowest point of the articular tubercle and Frankfort horizontal plane); 7. Length of anterior slope of condyle (ASL, the distance between the apex and the anterior point of condyle); 8. Length of posterior slope of condyle (PSL, the distance between the apex and the posterior point of condyle); 9. Angle between posterior and anterior slope of condyle (APA, the angle between the anterior slope and the posterior slope of condyle)