Regression models of computed tomography dimensions necessary for constructing the correct shape of the dental arch in Ukrainian young men and young women with physiological occlusion and a wide facial type depending on the characteristics of teleradiometric indicators according to the Steiner or Tweed methods and computed tomography dimensions of the teeth

Abstract

In modern orthodontics, an important task is the individualization of treatment planning taking into account the morphological and cephalometric characteristics of the patient. Of particular interest are indicators that reflect the relationship between bone structures and the position of the teeth in the jaws. The use of regression analysis allows you to create predictive models that increase the accuracy of diagnosis and the effectiveness of therapy. The study of these relationships among young people with certain anthropometric characteristics will contribute to the development of more informed orthodontic decisions by the doctor. The aim of the study is to develop regression models of linear dimensions necessary for constructing the correct shape of the dental arch depending on the features of teleradiometric indicators according to the Steiner or Tweed methods and computed tomography dimensions of teeth in Ukrainian young men (YM) and young women (YW) with physiological occlusion and a wide face type. On the obtained teleradiograms (25 YM and 25 YW with physiological occlusion and a wide face type), measurements were performed using the Steiner S. S. and Tweed C. H. methods, and on computed tomograms – morphometric study of teeth and dental arches. Regression models of linear dimensions necessary for constructing the correct shape of the dental arch were constructed using the “Statistica 6.0” license package. In YM, taking into account the Steiner or Tweed method, all 18 possible reliable models with a coefficient of determination greater than 0.6 were constructed (respectively R2= from 0.835 to 0.973 and R2= from 0.821 to 0.972, p<0.001); and in YW, taking into account the Steiner method, all 18 models (R2= from 0.763 to 0.931, p<0.001) and taking into account the Tweed method, 17 models (R2= from 0.733 to 0.952, p<0.001). When analyzing the frequency of occurrence in the models of computed tomography tooth sizes and teleradiometric indicators according to the Steiner or Tweed methods, it was established: in YM, the width of the crown part of the tooth in the mesio-distal and vestibulo-oral plane, teleradiometric indicators, and also (only when taking into account the indicators according to the Tweed method), the length of the tooth is most often included; in YW – teleradiometric indicators, the width of the crown part of the tooth in the mesio-distal and vestibulo-oral plane and the width of the cervical part of the tooth in the vestibulo-oral plane when taking into account the indicators according to the Steiner method, and when taking into account the indicators according to the Tweed method – teleradiometric indicators, the width of the cervical part of the tooth in the vestibulo-oral and mesio-distal plane and the width of the crown part of the tooth in the mesio-distal and vestibulo-oral plane. When analyzing the frequency of occurrence in the models of the corresponding teeth, it was found that in YM the upper and lower incisors, upper canines and upper premolars are most often included, and in YW – the upper and lower incisors, lower canines, and (only when taking into account the indicators according to the Steiner method), the lower premolars.