Features of the Spee curve on radiographs and its changes in the treatment of patients with the "straight" arc technique

Автор: Shkarin V.V., Dmitrienko T.D., Mikhalchenko A.D.

Журнал: Волгоградский научно-медицинский журнал @bulletin-volgmed

Статья в выпуске: 3 т.22, 2025 года.

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Determining the features of the Spee occlusal curve is an urgent task in prosthetic dentistry and orthodontics. In most cases, the curvature of the occlusal plane is determined on plaster models of the jaws. At the same time, there is very little information about the methods of constructing the Spee occlusal curve on the TRG in the lateral projection. Purpose. To develop a method for constructing the Spee curve on a lateral telerentgenogram and to analyze it in people with physiological and pathological occlusion, as well as to evaluate the change in the occlusal curve in the treatment of patients with the "straight" arc technique. Materials and methods. The study was multifaceted and included the analysis of telerentgenograms and orthopantomograms of young people with physiological variants of the occlusal relationship of antagonists. This study was a retrospective cohort study. The distance between the anterior and posterior occlusal points through which the occlusal line passed was measured. Using PowerPoint programs, it was possible to draw a circle along the line of closure of the teeth through the occlusal points. The radius of the circle was measured. The ratio of the radius of the circle to the length of the sagittal size of the occlusal line was evaluated. The depth of the occlusal curve was measured from the point of the largest bulge to the occlusal line. The statistical analysis included the calculation of averages (M) and the error of representativeness (±m). Results and discussion. In the course of the analysis, a method was developed for constructing the Spee curve on the TRG in a lateral projection based on the proportionality of the sagittal size of the occlusal line, measured between the anterior and posterior occlusal points of the inferior dental arch and the radius of the occlusal circle. The radius exceeded the sagittal distance of the occlusal line by an amount corresponding to the Fibonacci number (1.618) and the golden ratio principle. The performed treatment with the "straight" arc technique contributed to the normalization of occlusal balance and the anterior teeth edge, however, it did not correspond to the optimal occlusal status characterizing physiological occlusion. Conclusion. The data obtained formed the basis for the differential diagnosis of physiological and pathological variants of the Spee curve. It should be noted that the treatment of patients with the "straight" (flat) arc technique, regardless of the severity of the Spee curve before treatment, does not correspond to achieving the optimal occlusal status characterizing physiological occlusion.

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Physiological occlusion, telerentgenography, distal occlusion, straight arc technique, golden section

Короткий адрес: https://sciup.org/142245921

IDR: 142245921   |   УДК: 616.314-089.23   |   DOI: 10.19163/2658-4514-2025-22-3-81-89