RESUMO
BACKGROUND: Myofunctional condition of the temporomandibular joint (TMJ) in everyday orthodontic practice is an important diagnostic criterion for evaluating the quality of orthodontic treatment. Pre-orthodontic preparation is often a necessary stage of orthodontic treatment. OBJECTIVE: To evaluate and compare the adaptation of the masticatory muscles of patients during pre-orthodontic preparation based on interference electromyography of the masticatory and temporal muscles with the data of patients after orthodontic treatment without preparation and with the indicators in the control group. MATERIALS AND METHODS: Electromyography indicators of the masticatory and temporal muscles of 82 patients aged 18 to 35 were obtained. Patients were divided into 3groups: 1st - with signs of TMJ dysfunction at the stage of pre-orthodontic preparation and orthodontic treatment; 2nd - patients after orthodontic treatment, having dissatisfaction with the state of the dentition; 3rd - a control group was compared composed of patients without signs of myofunctional dysfunction. RESULTS: Patients who have complaints after orthodontic treatment have different electromyography of the masticatory and temporal muscles in comparison with the control group. In patients with signs of TMJ dysfunction at the stage of preorthodontic preparation, after using a device of their own design, the structures of the temporomandibular joint were adapted to a new functional position. CONCLUSION: After using the device of its own design, myofunctional adaptation to a new functional position was obtained, which is confirmed by electromyographic studies.
