Determination of cephalometric parameters according to the COGS method, which characterize the position of individual teeth relative to cranial structures depending on the types of faces in Ukrainian young men and young women with an orthognathic bite

Abstract

An aesthetically pleasing face is one of the main goals of orthodontic treatment. However, in the case of severe pathology, in order to achieve the harmony of the complex of soft and hard tissues of the face, it is necessary to carry out not only orthodontic but also surgical intervention, i.e. orthognathic surgery. A cephalometric analysis for orthognathic surgery (COGS) is an effective element necessary for planning such treatment. The purpose of the study is to establish the peculiarities of cephalometric parameters that characterize the position of individual teeth relative to cranial structures according to the COGS method in Ukrainian young men and young women with an orthognathic bite, depending on the type of face. 46 young men (aged 17 to 21) and 72 young women (aged 16 to 20) who belonged in three generations to residents of Ukraine of the Caucasian race and had an orthognathic bite, underwent cephalometry according to the COGS method. OnyxCeph³™ software, version 3DPro, Image Instruments GmbH, Germany, was used for cephalometric analysis of indicators characterizing the position of individual teeth relative to cranial structures. According to the value of Garson's morphological index, the type of face was determined. Statistical processing of the obtained results was carried out in the license package “Statistica 6.0” using non-parametric estimation methods. Between young women with different types of face, the following reliable or trends of differences in linear and angular indicators, which characterize the position of individual teeth relative to cranial structures according to the COGS method, were established: in young women with a very wide face type, smaller values of the distances 1u-NF, 1l-MP, 6u-NF and the OP-HP angle (compared to medium and narrow face types), as well as the 6l-MP distance (compared only to the medium face type); young women with an average face type have larger values of the 6l-MP distance (compared to narrow face types), as well as the OP-HP angle (compared to wide and narrow face types). Between young men with different types of faces, there are practically no reliable or trends of differences in linear and angular indicators that characterize the position of individual teeth relative to cranial structures according to the COGS method. Manifestations of sexual dimorphism of linear and angular indicators, which characterize the position of individual teeth relative to cranial structures according to the COGS method, have been established: in young men, the values of most linear dimensions are higher in representatives with very wide, wide and narrow face types; young women with different types of faces have larger values of the OP-HP angle. The obtained results will allow dentists to provide the necessary assistance to the patient at a modern level, taking into account not only the age, sex and ethnic characteristics of a person, but also the type of his face.