A cephalometric analysis was performed (in OnyxCeph³™ software, version 3DPro, Image Instruments GmbH, Germany) according to the Steiner, Ricketts and Downs methods of 46 young men (YM) (aged 17 to 21) and 72 young women (YW) (aged 16 to 20) with different types of face, which had a physiological bite as close as possible to orthognathic (hereinafter orthognathic). For the first time, in Ukrainian YM and YW with an orthognathic bite with different facial types, the limits of the percentile range of teleroentgenographic indicators of the first group, determined by the methods of Bjork, Burstone, Jarabak, Ricketts, Schwarz and Steiner, as well as the arch and third groups, determined by the methods of Steiner, Ricketts and Downs were established, which can serve as standards for young Ukrainians. Expressed manifestations of sexual dimorphism of the linear cephalometric parameters of the first group were established for the first time: in YM with different types of faces, the values of the distances N-S according to Jarabak, Ar-Go according to Burstone, N-Se according to Schwarz and N-CC are significantly greater than in YW with the corresponding types of faces by Ricketts (compared to very wide, wide, medium and narrow face types), P-PTV by Ricketts (compared to very wide, wide and narrow face types), S-Ar by Jarabak (compared to both wide and narrow face types) and S-E by Schwarz (compared to narrow face). Practically no reliable differences in the indicators of the first group were established between YM or between YW with different types of face. For the first time, between Ukrainian YM or YW with an orthognathic bite with different facial types: reliable or trends of differences in cephalometric indicators of the second and third groups determined by Steiner, Ricketts and Downs methods were established; manifestations of sexual dimorphism of cephalometric indicators of the second and third groups determined by Steiner methods were established (larger values for linear and angular indicators of the third group in YW and larger values only for linear indicators of the second group in YM), Ricketts (mainly higher values in YM of linear indicators of the second group, and in YW – angular indicators of the second group) and Downs (insignificant manifestations of sexual differences). For the first time in Ukrainian YM with a wide face and YW with very wide and wide face types with an orthognathic bite, reliable regression models were developed and analyzed (with a coefficient of determination R2 > 0.6) individual cephalometric indicators of the second group depending on the indicators of the first group and models of appropriate individual cephalometric indicators of the third group depending on the indicators of the first and second groups used in Steiner, Ricketts and Downs methods.
