The purpose of this study — is to study the differences in recurrent indicators based on electroencephalography signals of patients after orthodontic treatment during cognitive tests. Depending on the type of impact (installation of braces or aligners), identify markers in the canals, which can be used to further determine the strength of stress from orthodontic intervention for subsequent correction of treatment.

Methods. Recurrence analysis was used to study electroencephalography data. In particular, recurrent indicators were constructed for each channel of each patient.

Results. The channels in which changes in recurrent indicators with different types of orthodontic influence are the greatest are demonstrated. For these channels, the dynamics of recurrent indicators in them is described to highlight some markers of stress and pain experienced by the patient.

Conclusion. In the course of the study, recurrent indices were constructed based on the electroencephalography data of patients after orthodontic treatment. It was shown that the highest differences in patients of different groups were demonstrated by the temporal and occipital canals (O1, O2, T3, T4, T5, T6). Thus, the value of recurrent indices of this group of indices should be used as a marker of the patient’s condition.