Study of the profile of the soft tissues of the face, taking into account the individual typological features of the dental arches

Abstract

Based on the results of the analysis of profile photostatic images of 96 people aged 18–25 years with physiological types of bite, the main anthropometric landmarks were determined and the position of the lips relative to the nasal line passing through the “n” point (nasion) and the “sn” point (subnasale) was studied. Depending on the size of the interincisal angle of the antagonistic medial incisors, which determine whether they belong to the trusive type of dental arches, patients were divided into three groups with mesotrusion (n=37), protrusive (n=34) and retrusion (n=25) types of dental arches. It was found that in almost all patients of the first group, the upper lip touches the nasal line, and the lower lip recedes slightly backwards, while the average value of the incisal angle is 135.24±3.09°. In most patients of the second group, the upper and lower lips are located anterior to the nasal line, and the average inter-incisal angle is 116.24±3.02°. Mostly in patients of the third group, the upper and lower lips were located behind the nasal line, and the average values of the incisal angle were 146.24±3.34°. The data obtained expand the understanding of the topography of the facies contour of the upper and lower lips with various types of dental arches, are of applied importance for assessing the harmony of the aesthetic profile of the soft tissues of the face, and are also criteria for the effectiveness of the rehabilitation of patients with dentoalveolar pathology, taking into account the individual characteristics of the maxillofacial region.