Correlations of basal cranial structures characteristics determined by Bjork and Jarabak methods with teleradiographic parameters of the upper and lower jaws and tooth location in young men and young women with orthognathic occlusion

Abstract

The widespread use of methods of cephalometric analysis in practical orthodontics requires the adaptation of normative indicators for members of the local ethnic group. It is also important to study the relationships between cranial and odontometric parameters to understand the effects of these components on each other. The aim of the study was to establish the peculiarities of correlations between the characteristics of basal cranial structures determined by Bjork and Jarabak methods with teleradiographic parameters of the upper and lower jaws and the location of teeth in Ukrainian young men and young women with orthognathic occlusion. Teleradiography was performed in the mode of cephalometric examination of 49 young men (aged 17 to 21 years) and 76 young women (aged 16 to 20 years) who had a physiological bite as close as possible to orthognathic. Cephalometric analysis according to modifications of Jarabak J. R. – Roth-Jarabak and Bjork A. – CFT-Bjork methods, performed using OnyxCeph³™ software, 3DPro version, Image Instruments GmbH, Germany (software license № URSQ-1799). All indicators were divided into three groups according to Dmitriev M. O. (2017): the first group included metric characteristics of the skull, which are used as basic indicators in the methods of cephalometric analysis; to the second group – dental-maxillary in which the skeleton has already been formed and which surgical methods can change the length, width, angles and positions of the upper and lower jaws; to the third group – indicators that actually characterize the position of each individual tooth relative to each other, cranial structures and the profile of the soft tissues of the face. Correlation assessment was performed in the license package "Statistica 6.0" using the non-parametric Spearman method. As a result of the conducted researches in Ukrainian young men and young women with orthognathic occlusion the peculiarities of multiple correlations of characteristics of basal cranial structures determined by CFT-Bjork and Roth-Jarabak methods with teleradiographic parameters of upper and lower jaws and tooth location were established. Both the CFT-Bjork method and the Roth-Jarabak method have more reliable correlations in both young men and young women between the first and second groups (23.3 % for young men and 50.0 % for young women for CFT-Bjork and 48.4 % for young men and 41.1% for young women according to Roth-Jarabak) than between the indicators of the first and third groups (respectively 12.8 % for young men and 7.7 % for young women for CFT-Bjork and 22.5 % for young men and 12.5 % for young women for Roth-Jarabak). The expressed manifestations of sexual dimorphism of the received correlations between the indicators defined by CFT-Bjork and Roth-Jarabak methods both on quantity and force, and in some cases on a direction of correlations are established.

Correlations of teleradiographic parameters of teeth location determined by the methods of Bjork, Jarabak and Sassouni with the parameters of the upper and lower jaws in young men and young women with orthognathic occlusion

“…A quantitative analysis of significant correlations between the indicators of the second group with the indicators of the third group according to the CFT-Bjork method in Ukrainian young men and young women with orthognathic occlusion revealed the following distribution of correlations: in young men -61 correlations out of 130 possible (46.9 %), of which, 5.4 % direct strong, 18.5 % direct medium strength and 2.3 % direct weak and 2.3 % reverse strong, It should be noted that in previous studies in the analysis of the correlations between the characteristics of basal cranial structures (first group) with teleradiographic parameters of the upper and lower jaws (second group) and the location of teeth (third group) by CFT-Bjork in young men on average 18.1 % direct average correlations, and young women -an average of 28.9 % evenly direct and inverse average correlations [28].…”

“…In previous studies, the analysis of the correlations between the characteristics of basal cranial structures (first group) with teleradiographic parameters of the upper and lower jaws (second group) and the location of teeth (third group) by the Roth-Jarabak method in young men found an average of 35.5 % feedback, and in young women -on average 26.8% are also mostly of medium strength direct and feedback [28].…”

Regression models of teleradiographic parameters according to the Jarabak method in young men and young women with orthognathic occlusion

“…Cephalometric measurements by the method of Jarabak included the determination of the following parameters [22,23]:…”

Regression models of teleradiographic parameters according to the Bjork method in young men and young women with orthognathic occlusion

“…Cephalometric measurements according to the Bjork method included the determination of the following parameters [21,22]: the first group -the angle N-S-Ar, characterizes the position of the temporomandibular joint (°); angle N-S-Ba, characterizes the angle of the skull base (°); the ratio N-S:S-Ar', characterizes the position of the projection of the temporomandibular joint on the line N-S (conventional units);…”