The AEI was measured on lateral digital skull images as the angle between the best fit line drawn along the posterior wall of the articular eminence and the Frankfurt horizontal plane.
The AEI was measured in relation to the Frankfurt horizontal plane.
Data was collected from lateral cephalometric radiograph taken with the patient's Frankfurt horizontal
plane parallel to floor, mandible in centric occlusion and lips at rest.
Control the Frankfurt horizontal
plane which runs from the lower left orbit to the upper margin of the external auditory canal (a correct exposure shows a slight smile).
The skull underwent a standard PA radiograph according to Caldwell's technique, which consists of positioning the Frankfurt horizontal
plane parallel to the floor (0[degrees]).