الفهرس 
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Abstract
Objectives: The objective of this study is to determine the normal values of the facial soft tissue of Egyptian adolescent and to determine the presence of any gender differences.
Materials and Methods: Subjects were scanned using Planmeca ProMax 3D ProFace unit. The subject`s head was oriented before imaging in the natural head position. Three-dimensional soft tissue assessment was performed using 3D facial photogrammetry by Exo CAD Matera 2019 software where 22 soft tissue facial landmarks were identified in the frontal and lateral views. The soft tissue facial analysis in this study was divided into: A- Total face: which included the anterior facial height, morphological facial height, forehead height, lower facial height, chin height, facial width, facial convexity and mandibular width. B- Middle face: which included nasal height, nasal width, nasal depth, nasolabial angle, intercanthal width and eye width. C- Lower face: which included height and prominence of the upper and lower lips, width of the mouth and the labiomental angle.
Results:
The mean lower face height (Sn-Gn’) showed that males had significantly longer lower facial heights than females. When measuring the chin height (Sl-Gn’), males had significantly longer chins than females. The mean width of the mandible (Go-Go) measurement revealed that males had statistically significant wider mandibles than females. The mean ratio of the lower face height to the morphological facial height (Sn-Gn’ /N’-Gn’) for the total sample showed thatmales had significantly a higher ratio than females. The mean width of the nose showed that males had significantly wider nose than females. When measuring the mean of Nasolabiale angle, males had significantly higher nasolabial angle than females. The mean eye fissure length (Ex-Ex) revealed that females had statistically significant wider eye fissure length. The mean inter canthal width (En-En) measurement was revealed that males had statistically significant greater inter canthal width than females. The mean right eye width (En-Ex Rt) measurement showed that females had significantly wider right eyes than males. The mean left eye width (En-Ex Lt) showed females had significantly wider left eyes than males. The mean lower lip length (Stom-Sl) revealed that males had statistically significant longer lower lips than females. In the mean lower vermilion measurement (Sto-Li), females had significantly longer lower vermilion height. The mean width of the mouth (Ch-Ch) showed that females had significantly wider mouths than males.
Conclusion: The anterior facial height, morphological height, height of the forehead, facial index and the facial width did not show statistically significant difference between both sexes, Egyptian adolescent males showed longer lower facial heights, chin height and wider mandibular widths when compared to females. The width of the nose was significantly greater in males however, the facial convexity, nasal protrusion and nasal height did not show any sexual dimorphism. Males had a significantly larger nasolabial angle but females had wider eyes and mouths. All lip measurements were nearly equal except lower lip length which was significantly longer in males in contrast to the lower vermilion height which was longer in females. Most of the facial measurements of Egyptian adolescents were similar to those of Italians and Americans. However, there were few differences when compared with West African, Malaysian and Iranian adolescents.