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Aim. To study the condition of the autonomic nervous system in groups of adolescents in the period of retention after active orthodontic treatment with non-removable equipment. Methods. Examined were 100 adolescents aged 13-17 years in the period of retention after active orthodontic treatment. The baseline autonomic tone was assessed according to the combined table of sympathetic and parasympathetic reactions (Wayne A., 1981) in the modification of N.A. Belokon’ et al. (1986) for children and adolescents, taken into account were the heart rate, respiratory rate, systolic and diastolic blood pressure. In order to evaluate the adaptation of the organism used was a mathematical analysis of the heart rhythm (cardiointervalography), determined was the mode (Mo), the amplitude of the mode (AMo), and the variational span (ΔX). Results. Revealed were two groups of patients with different variants of the course of retention: favorable course without recurrence (53%) and unfavorable course with recurrences (47%). In the group of patients with recurrences cardiointervalography most frequently showed a asympaticotonic (41.7%) or hypersympaticotonic (58.3%) type of autonomic reactivity. In all patients of the group with recurrences noted was a disturbance of the adaptation processes. The state of adaptation is regarded as unsatisfactory in 72.6% of cases, as the complete adaptation failure - in 27.4%. Conclusion. A recurrence during the period of retention after active orthodontic treatment occurs significantly more frequently in the group of patients with high constraint and overload of the autonomic reactivity, with a mismatch of cardiac rhythm management processes, with a reduction of the adaptive capacity of the organism to the level of complete failure of adaptation; patients who have expressed sympathicotonia, are at risk for destructive periodontal disease and require special attention during the retention period.

The nature of the course of the retention period in adolescents after orthodontic treatment depending on the state of the autonomic nervous system