SPECIFIC FEATURES OF GRINDER TEETH ROTATION AT PHYSIOLOGICAL OCCLUSION OF VARIOUS GNATHIC DENTAL ARCHES

a B s t r a C t -The article offers a view on the outcomes of analyzing the convergence angles of conditional occlusal midlines passing through the middle of the occlusal surface and intersecting with the median sagittal plane, which allows determining the specifics of the upper and lower jaws grinder teeth rotation. The subject of the study was the cast models of the jaws obtained from 64 persons with physiological occlusion, a full set of permanent teeth and various gnathic (mesognathia, brachygnathia, dolichognathia), and dental (macrodontia, normodontia, microdontia) types of dental arches. Detailed examination of the data regarding grinder teeth rotation in view of the gnathic and dental type of dental arches in people with physiological occlusion, allowed us to develop, substantiate and test an examination algorithm for patients with torsioversion to be found in almost all types of anomalies and deformations of dental arches. This algorithm allowed increasing the reliability of measurements (linear, angular) in the transversal plane; identifying the degree of complexity, and selecting the treatment tactics; describing the variability of the convergence angles for grinder teeth with different gnathic and dental types of dental arches, and evaluating the effectiveness of orthodontic treatment in patients featuring dentition abnormalities and deformations. K E Y w o r d s -teeth torsioversion; physiological occlusion; tooth convergence angle; gnathic, dental type of