Features of determining the trusive types of dental arches of physiological occlusion and their main characteristics

Determining the types of dental arches is a relevant topic of scientific and practical research. Purpose. Development of research methods and determination of the features of trusal types of dental arches of physiological occlusion. Material and methods. A retrospective cahort study of 62 pairs of plaster models of jaws, the occlusal status of which corresponds to the physiological norm, was carried out. To distribute the material according to the types of trusal arches, the recommendations of specialists were used with the measurement of the distal transversal and odontometry of 14 teeth of the upper and lower jaw. In the photographs of the models, central and distal points were established, which were connected by diagonal lines that formed a diagnostic triangle. When determining the angular parameters, the sine of the angles was mathematically calculated and measured using a protractor. Outcomes. The value of the index for the mesotrusive type was (0.68 ± 0.04) units, the value of the index less than 0.63 units is characteristic of the dental arches of the retrusive type, and more than 0.72 units is characteristic of incisor protrusion The value of the incisal angle, for the mesotrusive type, ranged from 70 to 78°. An increase in the central angle of more than 79° determined the belonging of the dental arch to the retrusive types, and a value of less than 69° is characteristic of the protrusive arches. Conclusion. Thus, the resulting determination of the size of the trusal type and the incisal angle of the dental triangles of both jaws can be used to assess the features of the dental arches and their distribution according to the trusive type.