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In spite of the existence of numerous developed methods of cephalometric analysis, which should help to choose the right direction of orthodontic treatment, usually the doctor has to act intuitively, based on his experience, because their development didn’t take into account numerous factors (ethnicity, age, gender, etc.). Improving these techniques, considering the above-mentioned factors, would significantly increase their effectiveness, and hence the quality of providing dental care to the population. The purpose of the work is to construct and analyze a regression model of teleroentgenographic indicators used in the method of C. J. Burstone in young men and women with normal occlusion close to orthognathic bite and harmonic face. Primary side teleroentgenograms of 38 young men (aged 17-21 years) and 55 young women (aged 16-20 years) with normal occlusion close to orthognathic bite and harmonic face, obtained from the Veraviewepocs 3D device, Morita (Japan), taken from the bank data of research center of National Pirogov Memorial Medical University, Vinnytsya. Cephalometric measurements were performed according to the recommendations of C. J. Burstone. All indicators were divided into three groups: 1 - metric characteristics of the skull, which usually do not change during surgical and orthodontic treatment; 2 - indicators of the tooth-jaw system, the definitions of which most often need to be guided by the orthodontic treatment of growing patients and orthodontic surgery, which allows people with already formed bone skeleton to change the width, length, angles and position of the bones of the upper and lower jaws; 3 - indicators that actually characterize the position of each individual tooth relative to each other, to the bony cranial structures and face profile. Regression models of individual teleroentgenographic indicators used in the method of C. J. Burstone, built using the licensed package “Statistica 6.0”. Constructed all 6 reliable models of indicators included in the second group (anterior lower facial height ANS-Gn/Me, maxillary length ANS-PNS, ramus length Ar-Go, mandibular length Go-Pog, anterior upper facial height N-ANS and posterior upper facial height PNS-N) depending on the indicators of the first group (posterior section of cranial base Ar-Pt, anterior skull base length N-CC, angle of the cranial tilt POr-NBa, anterior section of cranial base Pt-N and distance P-PTV); as well as all 7 reliable models of indicators included in the third group (distances 1u-NF, 1l-MP, 6u-NF, 6l-MP and angles OP-HP, Max1-NF/Max1-SpP, Mand1-Mp/Mand1-MeGo) depending on the indicators of the first and second (distance A-B, A-NPog, Gо-CF, Max-Mand, N-A, N-B, N-Pog and Xi-Pm and angles MeGo-NPog, MP-HP, NAPog, N-ANS-Pog, N-CF-A, NPog-POr, POr-CFXi і POr-ANSPNS) groups. It was established that in young men the model of telerentgenographic indices included in the second group depending on the indicators of the first group and included in the third group, depending on the indicators of the first and second groups, have a higher determination coefficient than in young women (R2 from 0.806 to 0.918 in young men and from 0.510 to 0.768 for young women, and from 0.750 to 0.993 for young men and from 0.510 to 0.986 for young women). In the analysis of entering into the regression models of the relevant predictors found that in young men among the teleroentgenographic indicators of the first group included in the models of indicators of the second group most often included - distances P-PTV (33.3%), Pt-N and N-CC (by 25.0%); and in young women– distances N-CC (38.5%) and P-PTV (30.8%). It was also found that among young men among the teleroentgenographic indicators of the first and second groups that were included in the models of the third group of indicators most often included - distance ANS-Gn/Me (12.8%), the magnitude of the angles NAPog, POr-CFXi and POr-ANSPNS (by 9.4%); and in young women– distance ANS-Gn/Me (13.2%), distances А-В and PNS-N and the magnitude of the angle NAPog (by 7.9%).

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In this work, we describe the boundary percentile scope values of transversal characteristics of the dental arch of boys and girls of Podillia, with diagnosed orthognathic bite. The study group consists of individuals with different forms of head and face. Our findings are that, in girls, unlike boys, set differences exist in the transversal dimensions of the upper and lower jaw, both in the distribution of the shape of the head, and the type of face. In boys with different head shape, larger values of transversal size of dental arch are evidenced when contrasted with the corresponding groups of girls, regarding the maxilla in 46.7% of all cases and the mandible in 22.2% of all cases, as well as with different types of faces in 66.7% of cases regarding the maxilla and 55.6% in the mandible.

To date, there are no clear recommendations on the use of a particular indicator, cephalometric method, normative basis for the inhabitants of Ukraine when assessing the cephalometric characteristics of the occlusal plane. The purpose of the study - by studying cephalometric indices and conducting direct stepwise regression analysis - develop in young men and women of Ukraine with orthognathic bite mathematical models of individual characteristics of the position of the occlusal plane. In 38 young men (aged 17-21 years) and 55 young women (aged from 16 to 20 years) with occlusion close to orthognathic bite and balanced faces, lateral teleroentgenograms were obtained using the Veraviewepocs 3D device, Morita (Japan). Cephalometric analysis was performed using OnyxCeph³™ software. Cephalometric points and measurements were performed according to the recommendations of W. B. Downs, J. McNamara, R. A. Holdway, P. F. Schmuth, A. M. Schwarz, C. C. Steiner and C. H. Tweed. In the licensed statistical package "Statistica 6.0", using regression analysis, the following teleroentgenographic characteristics of the position of the occlusal plane were simulated: the angle YGOCLPl, the angle POR_DOP, the angle POR_OCP, and the SN_OSP angle. It was established that in both young men and women, all four possible models with a determination coefficient from 0.808 to 0.998 in young men and from 0.832 to 0.974 in young women were constructed. In the analysis of models of teleroentgenographic characteristics of the position of the occlusal plane, depending on the peculiarities of the metric characteristics of the craniofacial complex, it was found that in young men the most frequent regression equations include - the Wits indicator (21.1% for all four equations), the angle AB_NPOG (15.8%) and the distance PN_POG (10.5%). In young women, most often the regression equations include - Wits indicator (17.4% - also to all 4 equations); angle AB_NPOG, distance AFH, angle MM and angle SN_GoGn (by 8.7%). So, using the method of stepwise regression, among Ukrainians of juvenile, based on the features of teleroentgenographic indicators, reliable models of individual cephalometric characteristics of the occlusal plane were created.

The article describes the differences in peculiarities of somatotype and body weight component composition in patients with acne, the study population being boys and girls of the Podillya region of Ukraine. In the study subjects, regardless of sex, body muscle mass, bone mass and the mesomorphic somatotype component of those with acne were significantly greater, while fat body mass indicators and the endomorphic somatotype component was smaller – in comparison to that of non-afflicted subjects of similar gender. Regarding the ectomorphic component of somatotype, between the surveyed groups of those with and without acne, whether male or female, no significant differences were revealed. For all indicators, whether the somatotype components or the component composition of body weight, between groups of boys or girls with different degrees of severity of acne, again no significant differences were established.