Abstract
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.
Highlights
The issue of dentitions occlusion in scientific and practical literature have a lot of attention
The analysis of teleroentgenograms and the results of their researches for Ukrainian young men and women is described in detail and set out in a number of previous articles [7,8,9,10, 17, 18]
A. and Martins R.P. [2] suggested the use of a Functional Aesthetic Occlusal Plane (FAOP), which passes through the point of closure of the lips and the midpoint of the contact between the molars of the upper and lower jaws as a benchmark
Summary
The issue of dentitions occlusion in scientific and practical literature have a lot of attention. The existence of different philosophies, techniques, often lack of common definitions - constantly encourages scientists and practitioners to conduct new research in this field. With the development of science, there is more and more issues related to the functioning of the tooth-jaw system and its impact on other organs and systems. One of the main functions of the teeth and jaws is chewing function, which is implemented when closing the dental rows of the upper and lower jaws. The closure occurs in certain occlusion contact points, the totality of which forms the actual occlusion plane. Depending on the shape and nature of the closure, different contact groups are formed
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