The asymmetry of young men’s faces upper and middle parts do not depend on its shape and the skull shape

The human face plays an important role in the process of interpersonal communication and is the object of research by specialists in various fields, including anatomists and anthropologists. Currently, significant experience has been accumulated in studying the morphometric parameters of the face of different population groups, however, there is no information in the literature on the bilateral dimorphism of these parameters in the upper and middle parts of the face depending on the shape of the skull and the shape of the face itself. The purpose of the study is to determine the limits of variability of differences (asymmetry) in the morphometric parameters of the contralateral halves of the upper and middle parts of the face of young men in the frontal norm depending on the anatomical shape of their skull and face. The study involved 140 young men whose average age was 19.1 ± 0.7 years. After determining the shape of the skull and the shape of the face of the young men, photogrammetry of similar parameters of the upper and middle parts of the face in the frontal norm was performed. To determine the morphometric parameters, the following cephalometric points were used: trichion (tr), glabella (gl), nasion (n), subnasale (sn), zygion (zy), exocanthion (ex), endocanthion (en), pupilla (p), alare (al), as well as points p1 and p2, located at the intersection of the horizontal line with the facial contour drawn through the subnasale point. When comparing similar facial dimensions, the difference ("diff") between their average values was determined. According to the obtained results, in dolichocephalic young men (n=45) statistically significant differences were noted when comparing the distances gl-zy on the left and right (respectively 76.5±3.72 mm and 78.5±4.15 mm, diff=-2.02 mm; p=0.017), gl-р2 and gl-р1 (respectively 91.8±4.72 mm and 93.9±5.04 mm, diff=-2.06 mm, p=0.049), as well as n-zy and n-zy_dext (respectively 71.2±3.54 mm and 73.7±3.92 mm, diff=-2.55 mm, p=0.002). Similar results were obtained when studying other groups of young men. The results of the study of the morphometric parameters of the upper and middle parts of the face of young men in the frontal norm demonstrate the predominance of the values of the sizes of the right half of the face over similar parameters of its left half. At the same time, these differences do not depend on the shape of the skull and the shape of the face.