Electromyographic characteristics of masticatory muscles in orthopedic treatment of patients with fixed structures made of zirconium dioxide

Abstract

Goal. Electromyographic characteristics of changes in myostatic reflexes m. masseter and m. temporalis when used in orthopedic treatment of aesthetic crowns with complete anatomy of the masticatory surface of zirconium dioxide. Materials and methods. We studied the functional state of m.masseter and m. temporalis in subjects in order to determine the degree of reactivity and characteristics of the potential impact of reducing the number of occlusal contacts in the studied patients. Examination of the bioelectrical activity of the masticatory muscles was performed on the electromyographic complex Neuro-EMG-Micro. The condition of the muscles was studied in a state of relative physiological rest. Patients were divided into 3 groups. In the process of orthopedic treatment, they had fixed crowns on the molars of the lower and upper jaws. The first included 16 patients with metal-plastic crowns on antagonist teeth. Up to 2 — 15 patients with metal-ceramic crowns on antagonist teeth. Group 3 included 14 patients with zirconium dioxide-based crowns on antagonist teeth. The control group (17 patients) are individuals with intact dentitions, without concomitant somatic and dental pathology. Examinations were performed 1, 3, and 6 months after treatment. Conclusions. Digital accuracy of zirconium dioxide-based structures and high abrasion resistance allow to obtain a stable, stable, functional occlusion, which is confirmed by higher EMG values of the masticatory muscle group compared to other groups.