Regression Models of Individual Linear Sizes of Molars Depending on the Features of Cephalometric Indices in Practically Healthy Men of the Western and Eastern Regions of Ukraine

Abstract

Restoration of missing teeth should be done as close as possible to the natural anatomical features of the person's tooth-jaw apparatus. That is why the problem of aesthetics in dentistry has ceased to be only orthopedic and has shifted towards a constitutional and ethnic odontology. The purpose of the study is to construct and carry out analyzes obtained by regression analysis, models of computed-tomographic size of molars, depending on the features of cephalometric indices of practically healthy men of the Western and Eastern regions of Ukraine. A computed-tomographic study of molars with the following odontometry and cephalometry of 36 practically healthy men of the Western region of Ukraine – residents of Volyn, Rivne, Lviv, Chernivtsi, Ternopil, Khmelnytskyi, Transcarpathian and Ivano-Frankivsk regions and 35 men of the Eastern region of Ukraine - residents of Kharkiv, Donetsk and Luhansk regions was performed with the help of the Dental Cone-ray Tomography Veraviewepocs-3D (Morita, Japan). Regression models of linear sizes of molars, depending on cephalometric indices, were conducted using the statistical software package Statistica 6.1. As a result of the conducted research, reliable models of computed-tomographic size of the upper and lower jaws molars were constructed in practically healthy men of the Western [7 models of mesio-distal dimensions (R2 = 0.532-0.646), most of which include sagittal arc (12.5%), outer-eye width, nose depth, distance between nasion and inter-cutter point, body length of the lower jaw on the left, largest head circumference and maximum head length (by 7.5%); 6 models of vestibular-tongue dimensions (R2 = 0.527-0.646), which most often include nasal depth (20.0%), body length of the lower jaw to the left (16.0%), physiological face length and morphological face length (by 12.0%); 1 model of crown height (R2 = 0.579)] as well as Eastern [3 models of crown height (R2 = 0.538-0.682), which most often include nose depth (15.0%), face type, physiological face length, morphological face length, smallest width head and sagittal arc (by 10.0%); 2 models of mesio-distal sizes (R2 = 0.572 and 0.556), which most often include inter eye fossa width (15.4%)] regions of Ukraine. Thus, in practically healthy men from the Western and Eastern administrative-territorial regions of Ukraine, based on the specifics of cephalometric indicators and face type, reliable regression models (with determination coefficient R2 greater than 0.5) of computed-tomographic size of molars of the upper and lower jaws (out of 40 possible 14 for the western and 5 for the eastern regions of Ukraine).

Relationship of odontometric and cephalometric indicators. Review of literary sources

“…Also, for men, residents of western Ukraine, with a correct bite, reliable models of computer-tomographic dimensions of the large angular teeth of the upper and lower jaws were built. These models most often included such cephalometric indicators as: sagittal arc, external eye width, nose depth, distance between nasion and interincisor point, length of the body of the lower jaw on the left, the largest head circumference and the largest head length [20].…”

Regression models of teleradiographic indicators of the position of teeth and the profile of face soft tissues in ukrainian young men and young women with different face profiles according to Schwarz A. M.

“…Пирогова "Вісник Вінницького національного медичного університету", 2021, Т. 25, №2 ІSSN 1817-7883 eІSSN 2522-9354 number of studies with modeling of individual linear sizes of teeth depending on cephalometric indicators [16,17,22], indicators required for the design of the correct shape of dental arches [20] and modeling of individual cephalometric and gnatometric indicators used in various methods TRG analysis [5,6,8,12].…”