the purpose of this study is to clarify the rationale for the choice of the upper or lower jaw for positioning the occlusal splint

After being informed about the study and potential risks, all patients are giving written informed consent. Occlusal splints for the upper and lower jaws are made for each of the patients. An assessment is made of the relative values and distribution of chewing forces in two cases:

1. "maxillary occlusal splint - lower dentition";
2. "mandibular occlusal splint - upper dentition". The obtained values are used in the final elemental analysis of the stress-strain state and the degree of displacement of the dentition in both indicated cases.

Inclusion Criteria:

• continuous dentition
• diagnosis (by ICD*-10): K03.0 Excessive attrition of teeth
• diagnosis (by ICD-10): K07.6 Temporomandibular joint disorders
• complaints of nocturnal bruxism
• complaints of discomfort in the area of the chewing muscles
• no history of orthopedic and / or orthodontic treatment
• absence of concomitant general somatic pathologies in the stage of decompensation
• no history of psychogenic and psychosomatic disorders
• no history of cancer *ICD - Classification of Diseases

Exclusion Criteria:

• refusal of the patient during the clinical trial from further treatment

Data obtained through this study may be provided to qualified researchers with academic interest in temporomandibular joint disorders.

Data or samples shared will be coded, with no protected health information included.

Approval of the request and execution of all applicable agreements (i.e. a material transfer agreement) are prerequisites to the sharing of data with the requesting party.

Request will be evaluated under common conditions by Interuniversity Ethics Committee (A.I. Evdokimov Moscow State University of Medicine and Dentistry)

Data requests can be submitted starting 6 months after article publication.

Access to trial IPD (individual participant data) can be requested by qualified researchers engaging in independent scientific research, and will be provided following review and approval of a research proposal and Statistical Analysis Plan (SAP) and execution of a Data Sharing Agreement (DSA).