Comparative analysis of linear and angular parameters of the dentitional alveolar arches of the physiological norm

A retrospective analysis of linear and angular parameters of dental and alveolar arches was carried out on 62 pairs of models of the upper and lower jaw with signs of physiological age norm. The construction of diagnostic triangles of dental and alveolar arches was carried out on photographs of jaw models obtained from plaster. The trusal index was determined through the ratio of the arc depth to its width. The central angle of the arcs was determined between the diagonals. It was found that for the mesotrusal type of the upper dental arches, the trusal index ranged from 0.64 to 0.72, and for the alveolar arches, the index ranged from 0.72 to 0.78 units. The value of the central angle of the upper dental triangle in the mesotrusive type of arches ranged from 70 to 74°, and the angle of the upper alveolar triangle in the same type of arch was 62-69°. A decrease or increase in the indicators determined the belonging of the arcs to the protrusive and retrusive variants.