Determination of individual teleroentgenographic characteristics of the lower medial incisors position in Ukrainian young men and young women with orthognathic bite

Abstract

Ethnic, sexual and age features of the incisors positions point to the need for the development of techniques that allow to determine their individual characteristics, since commonly accepted standards recommended for optimal positioning of incisors can only be used as indicative. The purpose of the study – by studying teleroentgenographic indices and conducting direct stepwise regression analysis in young men and young women of Ukraine with orthognathic bite, to develop and analyze the mathematical models of individual characteristics of the position of the lower medial incisors. With the Veraviewepocs 3D device, Morita (Japan) in 38 young men (17 to 21 years of age) and 55 young women (aged from 16 to 20 years) with occlusion close to orthognathic bite and balanced faces received side teleroentgenograms. Cephalometric analysis was performed using OnyxCeph3TM software. Cephalometric points and measurements were performed according to the recommendations of A.M. Schwarz, J. McNamara, W.B. Downs, R.A. Holdway, P.F. Schmuth, C.C. Steiner and C.H. Tweed. According to the above methods, in the licensed package “Statistica 6.0” using direct straight line regression analysis, the teleroentgenographic characteristics of the position of the lower medial incisors (distance 1l_NB, distance 1l_APog, angle 1l_DOP, IMPA angle, Mand1_NB angle, FMIA angle and Mand1_MeIm angle) were performed. In young men with orthognathic bite of 7 possible models of teleroentgenographic characteristics of the lower medial incisors, 5 were constructed with determination coefficient R2 from 0.694 to 0.849, and in young women, all 7 possible models with determination coefficient R2 from 0.595 to 0.794. In young men most often the regression equations included - the angle ANB and facial vertical index GL_SN_S (by 11.5%); lower face height ANS_ME, face angle NBA_PTGN and distance S_E (by 7.7%). In young women most often the regression equations included – the angle of N_POG (16.7%); Wits indicator (13.9%); inclination angle I (8.3%); H-angle, maxillo-mandibular angle MM and angle of facial axis NBA_PTGN (by 5.6%). Thus, in the work with the help of the method of stepwise regression with inclusion, among Ukrainians of juvenile age, on the basis of features teleroentgenographic indicators, the analysis of reliable models of individual teleroentgenographic characteristics of the position of the lower medial incisors was developed and carried out.

Determination of individual linear and angular characteristics of the position of upper central incisors in Ukrainian young men and women with orthognathic bite

“…In the previous study [12], in the simulation of individual teleroentgenographic characteristics of position of the lower central incisors in young women with orthognathic bite of 7 possible regression models was constructed with 5 with a determination coefficient from 0.694 to 0.849, the most frequent (from 7.7 to 11.5%) included were the angle ANB, facial vertical index, lower face height ANS_ME, NBA_PTGN face angle and distance S_E. In young women, all 7 possible models with a determination coefficient from 0.595 to 0.794 (which is also lower than in the models of the position of the upper central incisors) were constructed, which most often (from 5.6 to 16.7%) included the angle N_POG, the Wits indicator, the inclinational angle I, and the H angle, the angle of the MM and the angle of NBa-PtGn (by 5.6%)…”

Regression Models of Individual Linear Dimensions Necessary for Constructing the Correct Form of Dental Arch in Young Women With a Wide Face, Depending on the Features of Odontometric and Cephalometric Indicators

“…It is about creating models that will help doctors create the perfect smile that is harmonious with the particular face of the patient. Works on this topic are already being carried out both in Ukraine and beyond its boundaries [2][3][4][5][6][7], and are based on the study of dependence as certain anthropometric indicators with other indicators, which at first glance may have nothing in common [8], and in some way related structures [9][10][11][12][13]. One such promising area is the study of odontometric and cephalometric indicators and their relationship with the shape of the dental arch in individuals of different sex, age and with different types of faces.…”