A 3D finite element model of the mandible dentition was developed, including 14 teeth, a periodontal ligament (PDL), and a splint made of polymethylmethacrylate (PMMA). The study considered three design options: 1—the case of splint absence; 2—the case of the splint presence installed after manufacture; and 3—the case of splint presence installed after correction (grinding) performed to ensure a uniform distribution of occlusal force between the teeth. For cases of absence and presence of splint, three measurements of the functional load were performed using the T-Scan III software and hardware complex (TekScan, Boston, MA, USA). It was found that the presence of a splint led to a decrease in the total value of the occlusive load and to a uniform distribution between all the mandible teeth. The occlusal force was considered as a static vertical force evenly distributed between the nodes belonging to the occlusive surface of the corresponding tooth for the first design option and the occlusal surface of the splint for the second and third ones, respectively. As a result of the study, it was concluded that the splint usage was effective in order to change the distribution of the functional load during the treatment of proved masticatory muscles’ parafunction; the safety of using a splint for teeth and surrounding tissues under the influence of the considered functional load was shown; the potential applicability of PMMA as a structural material of a splint that had been used for the treatment of masticatory muscles’ parafunction was established.

Article describes electromyographic studies as an important part in the structure of diagnostics and orthopedic dental treatment of patients with increased erasure of teeth. The results of the correlations between elecrocromyography revealed strong reliable connections during the work of the actual chewing and temporal muscles on the right and left. It is confirmed that muscle dysfunction does not occur in the area of only one isolated group, but involves muscles on both sides and often depends on the parafunctional habits of the patient and the use of one side or another during chewing.

Clinical and instrumental diagnostics, including electromyographic (EMG) and axiographic (EA) study of 24 patients to improve the efficiency of planning and predicting the results of their dental treatment was carried out. Correlation links were studied both within EMG and EA studies, and between them. There were no significant correlations between the parameters of EMG and EA of the methods of investigation. Therefore, for full dental rehabilitation ofpatients with tooth wear in the diagnosis and monitoring of the stages and results of treatment, it is necessary to carry out both methods, since they do not exclude each other, but supplement

The author’s technique of instrumental precision diagnostics of the area offacets of increased erasure and erosion of hard tooth tissues is proposed. The aim of the study was to calculate the occlusal contact area in patients with tooth wear and in persons with a conditional norm (attrition by forces of normal mastication) with the help of occlusiograms (T-Scan) and Adobe Photoshop. We examined 13 patients with tooth wear and 20 persons with a conventional norm. We performed occlusiography with T-Scan, then processed the digital image of occlusal contacts using a special program, keeping the data in a single resolution. Prepared graphics were opened in the Adobe Photoshop program, scaled, calculated the number ofpixels in 1 mm2. Then, the total area of the facets of erasure was calculated taking into account the color indexation, which reflects the degree of intensity of the occlusal contacts.