Modelling of the linear dimensions of dental arches in Ukrainian young men and young women with physiological occlusion and a wide facial type depending on the characteristics of Burstone cephalometric indicators and computed tomography tooth dimensions

Abstract

The variability of the linear parameters of dental arches may be determined by craniofacial characteristics and tooth sizes. Conducting a study that will allow a more accurate description of the interaction, i.e., the relationships of these three structures within a specific population, will make it possible to increase the validity of orthodontic diagnosis and treatment. The selection of Burstone cephalometric parameters is the most appropriate, given the limited number of studies using this analysis in the Ukrainian population. The aim of the study – development and analysis of regression models of the linear dimensions of dental arches in Ukrainian young men and young women with physiological occlusion and a wide facial type depending on the characteristics of Burstone cephalometric indicators and computed tomography tooth dimensions. On primary computed tomography scans and cephalograms of 25 Ukrainian young men and 25 young women with physiological occlusion and a wide facial type, obtained from the databank of the Research Center and the Department of Pediatric Dentistry of the National Pirogov Memorial Medical University, Vinnytsia, measurements of linear and angular indicators by the Burstone method and the dimensions of teeth and dental arches were performed. Regression models of dental arch dimensions depending on cephalometric indicators and computed tomography tooth dimensions were built using the licensed package “Statistica 6.0”. It was established that in young men and young women with physiological occlusion and a wide facial type, all 18 possible significant models of linear parameters necessary for constructing the correct shape of dental arches were built depending on the characteristics of Burstone cephalometric indicators and computed tomography tooth dimensions, with a coefficient of determination (R2) greater than 0.6 (in young men R2= from 0.829 to 0.980, p<0.001 in all cases; in young women R2= from 0.680 to 0.962, p<0.001 in all cases). Analysis of the frequency of inclusion of computed tomography tooth dimensions and Burstone cephalometric indicators in the models showed: in young men, cephalometric indicators were included most often (23.70 %), the width of the crown part of the corresponding teeth in the mesiodistal plane (20.74 %), and the width of the crown part of the corresponding teeth in the vestibulo-oral plane (17.04 %); in young women, cephalometric indicators were included most often (27.21 %), the width of the crown part of the corresponding teeth in the mesiodistal plane (13.24 %), the width of the crown part of the corresponding teeth in the vestibulo-oral plane (11.03 %), and the width of the cervical part of the corresponding teeth in the vestibulo-oral plane (10.29 %). Analysis of the frequency of inclusion of the corresponding teeth in the models showed: in young men, maxillary lateral incisors and canines were included most often (13.59 % each), maxillary central incisors (11.65 %), and mandibular canines (10.68 %); in young women, maxillary central incisors were included most often (23.23 %), mandibular canines (14.14 %), mandibular lateral incisors (13.13 %), maxillary lateral incisors (12.12 %), mandibular central incisors (11.11 %), and maxillary canines (10.10 %).