Fig. 1. Picture of skull illustrates the value of main parameters of IOF and AIOF with reference to the horizontal line from ANS to Z (unit: millimeters). A, distance from ANS to Z; AIOF, accessory infraorbital foramen; ANS, anterior nasal spine; B, vertical distance from the middle-upper edge of IOF to the line A; C, vertical distance from the middle-upper edge of AIOF to line A; D, horizontal distance from ANS to the intersecting point of the vertical line from IOF with line A; D:A, percentage of the ratio of distance D to distance A; E, horizontal distance from ANS to the intersecting point of the vertical line from AIOF with line A; E:A, percentage of the ratio of distance E to distance A; IOF, infraorbital foramen; X, horizontal distance between IOF and AIOF; Y, vertical distance between IOF and AIOF; Z, the lowest point of zygomaticomaxillary junction.
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