Regression models of individual cephalometric indicators used in the method of R. M. Ricketts

Abstract

It is proved that in the analysis of lateral teleroentgenograms according to different methods distances and angles have their normative indices which differ for persons of different ethnic, gender and age belongings. Therefore, for a full use in the orthodontics R.M. Ricketts method, similar studies are needed in Ukraine. The purpose of the work -in boys and girls with normal occlusion close to the orthognathic bite and harmonious face construct and analyze the regression models of teleroentgenographic indicators used in the method of R. M. Ricketts. Primary lateral teleroentgenograms of 38 young men (aged 17-21 years) and 55 young women (aged from 16 to 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 R. M. Ricketts. All indicators were divided into three groups: 1 -metric characteristics of the skull, which usually do not change during surgical and orthodontic treatment; 2 -tooth-jaw indicators, the definition of which most often guided by performing orthodontic manipulations of patients in children and adolescents, as well as those with already formed bone skeleton when orthodontic surgery can change the width, length, angles and position of the bones of the upper and lower jaws; 3 -indicators that characterize the position of each individual tooth relative to each other, to the bony cranial structures and face profile. The regression models of individual teleroentgenographic indicators used in the R.M. Ricketts methodology are constructed using the "Statistica 6.0" licensing package. Constructed all 2 reliable models of the indicators included in the second group (distance Go-CF and Xi-Pm), depending on the indicators of the first group (in young men R 2 = 0.884 and 0.928, and in young women -0.735 and 0.719); as well as in young men, 7 out of 8 possible reliable models (R 2 = 0.568 to 0.887) of the indicators included in the third group (the magnitude of the distances 6u-6l, Overjet, Overbite, 6u-PTV, 1l-APog, 1u-APog and Xi-OcP ) depending on the indicators of the first and second groups; and only 5 models for young women (6u-PTV, 1l-APog, 1u-APog and Xi-OcP distances, and the magnitude of the Max1-APog angle). In the analysis of entering into the regression models of the relevant predictors, it was found that in young men, among the teleroentgenographic indicators of the first group included in the two models of the second group, is the distance P-PTV, and in young women the front length of the base of the skull N-CC and the back of the skull base Ar-Pt It was also found that among young men among the teleroentgenographic indicators of the first and second groups, which were included in the models of the third group, the most frequent is the value of the distance B-Pog (11.1%); while in young women -distance B-Pog (15.6%) and an angle DC-X...

Regression Models of Individual Cephalometric Parameters in Ukrainian Young Men and Young Women With Different Facial Profiles According to Schwarz A.M., Which Can Be Adjusted During Surgery Depending on the Parameters That Usually Do Not Change

“…It should be noted that the N-CC distance, according to other researchers, was also among the indicators of the first group of basic cephalometric parameters, which were most often included into the models of the second group, both young men and young women when use Burstone C. J. [16], Harvold E. P. [12] analysis and was included into all constructed models in young women according to the method of Ricketts R. M. [13].…”

“…A number of researchers have simulated teleroentgenographic parameters of craniofacial structures in Ukrainian young men and young women with orthognathic occlusion, which are used in various methods of teleroentgenographic analysis. Thus, regression models of a number of teleroentgenographic indicators of the dental system were created, which should be determined when performing orthodontic treatment of patients, depending on the basic cephalometric indicators by the method of Charles J. Burstone [16] (by 6 models out of 14 possible with a coefficient of determination from 0.806 to 0.918 in young men and from 0.510 to 0.768 in young women), according to method of R. M. Ricketts [13] (by 2 models out of 13 possible with a coefficient of determination of 0.884 and 0.928 in young men and 0.735 and 0.719 in young women), according to method of E. P. Harvold [12] (young men -4 models out of 5 possible with a coefficient of determination from 0.616 to 0.940, and young women -3 models with a coefficient of determination from 0.571 to 0.857). At the same time, according to Dmitriev M. O. et al [14], who performed modeling of gnatometric parameters depending on the parameters of basal cranial structures in Ukrainian adolescents with orthognathic occlusion, in young men from 43 possible regression models built only 4 reliable models with a coefficient of determination greater than 0.5 (for indicators effective length of the upper jaw, the length of the upper jaw, the angle SND and the distance S_L), and in young women -no model with a coefficient of determination greater than 0.5.…”

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.

“…According to the results of the same modeling of TRG indicators using the R. M. Ricketts method, 2 possible models of indicators of the second group (distances Go-CF and Xi-Pm) were created for both young men and young women, depending on the indicators of the first group (respectively, R 2 = 0.884 and 0.928 and R 2 = 0.735 and 0.719) and 7 of the 8 possible reliable models in young men of the indicators included in the third group (distances 6u-6l, Overjet, Overbite, 6u-PTV, 1l-APog, 1u-APog and Xi-OcP) depending on the indicators of the first and second groups. Instead, only 5 such models of indicators of the third group were built for young women (distances 6u-PTV, 1l-APog, 1u-APog and Xi-OcP and angle Max1-APog) [5].…”

“…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].…”

Regression models of individual teleradiographic indicators according to Ricketts method in Ukrainian young men and young women with different face types

“…In the studies of Chernysh A. V. [8] in boys and girls with orthognathic occlusion without division into facial types according to the Ricketts method, only 2 models of teleradiographic indicators were included in the second group depending on the indicators of the first group (respectively R 2 = 0.884 and 0.928 and R2 = 0.735 and 0.719), as well as 7 in boys and 5 in girls models of indicators included in the third group depending on the indicators of the first and second groups (respectively R2 = from 0.568 to 0.887, and R 2 = from 0.515 to 0.880). Both boys and girls most often include the B-Pog distance in the constructed models of indicators included in the third group, depending on the indicators of the first and second groups (11.1 % for boys and 15.6 % for girls).…”