Morphometric features of the parameters of the mandibular segments and chin protrusion in normal and occlusive pathology

Variability in the parameters of the mandibular incisal segments is evaluated using various morphometric methods that require improvement for use in clinical practice. Purpose. To develop a method for determining the vertical and sagittal dimensions of the mandibular incisor segments in physiological and pathological occlusion on native specimens and teleradiographs and to assess its significance in clinical dentistry. Materials and methods. Measurements were carried out on 19 native specimens of the dentofacial segments of the mandibular incisors, on 36 teleradiographs with signs of physiological occlusion, and 28 radiographs with pathological occlusion variants. A method for studying dentition-maxillary segments is proposed, which was carried out on scaled photographs. The height and width of the segment in the dentalveolar and chin parts of the segment, which was divided into two sections by the conditional median vertical of the lower incisor, were determined. The division of the segment at the level of the apical point of the incisor made it possible to assess the parameters of the dentoalveolar and chin parts. Results and discussion. When assessing the vertical parameters of the chin protrusion, it was found that its variability was determined by high rates of representativeness error and sigmal deviation. Crown and root heights were less variable, as reflected in the assessment of dentalveolar segment height. Variability in sagittal sizes was also noted, especially in the apical and chin regions.