الفهرس 
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Abstract
Aim: The current research aimed to estimate the prevalence of facial asymmetry among the Egyptian population, Determining the type of asymmetry (whether related to chin or nose or eye) and its relation to gender (male or female).
Methodology: One hundred and fifty frontal photographic image were recruited from the orthodontic department clinics of multiple universities (Cairo, Ain shams, Alexandria و Al-Azhar and Mansora Universities). For standardization, only photos of patients properly oriented in a natural head position
were admitted. To achieve this posture precisely, all subjects’ heads had to be centered and fixed on a cephalostat. Fourteen points and ten lines connecting between the midsagittal line and the horizontal line were drawn to assess asymmetry.
Results: Six percent of subjects had linear chin deviation more than 6 mm and all of which were males. Linear chin deviation in 60% of the subjects was towards the left side and overall mean value of linear chin deviation in males was higher than females
with a statistically significant difference. The mean value of nose tip deviation in left side was significantly higher than right side. Nose tip linear deviation in 75% of the
subjects was less than 2 mm and 78% of the subjects had angular nose deviation less than 2 degrees. Angular nose deviation in females was significantly higher than males.10% of the subjects undergo angular nose deviation more than 2.9 degree.
Conclusions:
About six percent of the Egyptian population showed linear chin deviation above the perceptive threshold (6mm).3.92% of Egyptian population showed nose tip linear deviation above perceptive threshold (4mm).9% of Egyptian population had nose tip angular deviation above perceptive threshold (2.9 degrees).23.3% of the Egyptian population had eye canting above perceptive threshold (|2.3 degrees).9.8% of the Egyptian population showed asymmetry in oral commissure above perceptive threshold(3mm).