Methods for determining landmarks for the construction of the mandibular plane on radiographs

The mandibular plane on the lateral tele radiography is the main guideline for assessing the gnathic section of the face with occlusion anomalies. In order to develop a method for determining landmarks for the construction of the mandibular plane on orthopantomograms and lateral tele roentgenogram, taking into account the variability of the shape of the lower jaw, this study was carried out. 127 certified tele roentgenogram and corresponding orthopantomograms, which make up the museum fund of the department, were analyzed. The magnitude of the angle of the lower jaw formed by tangential lines to the branch and body was determined. The ratio of the mandibular plane was determined by the relation to the alveolar-occlusive plane, which connected the point of infradentale with the distal tubercle of the second molar. As a result of the study, it was found that the angle of the lower jaw on the tele roentgenogram, as a rule, corresponded to the angles of the orthopantogram formed by the tangent to the body of the jaw, drawn through the most convex points of the body contour. The parallelism of the alveolar-occlusive line of the mandibular plane of the tele roentgenogram was noted. On the orthopantomogram, the alveolar-occlusal line was parallel to the line connecting the "Go" point to the "Me" chin point. Conclusion. The obtained data can be used in the design of the occlusive plane in people with defects of the dental arches large in length in the clinic of prosthetic dentistry and in assessing the effectiveness of orthodontic treatment of anomalies of occlusive ratios.