[Duration of splint therapy in patients with temporomandibular joint disorders]. / Prodolzhitel'nost' splint-terapii u patsientov s sindromom bolevoi disfunktsii visochno-nizhnechelyustnogo sustava.

AIM: Studying the duration of treatment in patients with temporomandibular joint pain dysfunction syndrome, and the relationship of the duration of treatment with the age of the patient at the beginning of therapy. MATERIALS AND METHODS: The study was carried out using information from medical records of dental patients, information from additional examinations of patients who were treated at the National Medical Research Centre for Dentistry and Maxillofacial Surgery of the Ministry of Health of Russia from 2016 to 2022. Statistical research methods: to evaluate the normality of the distribution, graphical methods were used, as well as the Shapiro-Wilk criterion. RESULTS: The duration of splint therapy in patients with temporomandibular joint pain dysfunction syndrome varied from 4 to 27 months. The average duration of treatment of patients using occlusive splints was 10.5±5.3 months. Without abnormal observations, the average duration of splint therapy in patients with TMJ pain syndrome was 9.6±4.1 months. The obtained data allow stating the absence of a correlation between the age of patients and the duration of splint-therapy. CONCLUSION: The majority of patients (68.4%) complete the splint therapy stage within 1 year, and a very small part (1.8%) are treated for more than 1.5 years. The duration of treatment of patients with temporomandibular joint pain dysfunction syndrome does not depend on age or gender.

[The effects of a total TMJ endoprosthesis on the contralateral condyle]. / Vliyanie dvukhkomponentnogo endoproteza visochno-nizhnechelyustnogo sustava na kontralateral'nyi myshchelkovyi otrostok.

OBJECTIVE: To correlate the magnitude of the amount of translation of prosthesis and the native joint, and the postoperative change in the volume of the contralateral condylar process after unilateral total joint replacement. MATERIAL AND METHODS: The study examined 16 patients with post-traumatic jaw deformation treated with unilateral TMJ replacement using total endoprosthesis. The mandible kinematics was recorded using the Cadiax Diagnostic system and correlated with the remodeling of the native joint. RESULT: On average, the group showed an 8.5% decrease in the volume of the native condylar process. In 13 patients, the amplitude of the native joint movement in the mouth opening and the mandible pro- and laterotrusion markedly deviated quantitatively that combined with the translational movement of the TMJ endoprosthesis in all types of mandibular abduction in all the patients. Correlation analysis showed a moderate negative relationship (r= -0.43) in opening the mouth between the amplitude of movement of the native joint and of the endoprosthesis, as well as a noticeable negative strength of relationship. Also, the correlation analysis showed a moderate positive relationship between the change in the native condylar process volume and movement amplitude when opening the mouth, and an inverse correlation of the high strength of relationship between the change in the native condylar process volume and movement amplitude of the TMJ endoprosthesis. CONCLUSION: Electronic axiography found that patients in the postoperative period could restore some of the translational movements even with the attachment of the lateral pterygoid muscle cut off. The main factor influencing the magnitude of the endoprosthesis translational movement is the design of the fossa component: the ratio of the circumferential surface of the fossa to the diameter of the head of the endoprosthesis, as well as the presence of lateral stoppers. The study showed that unilateral TMJ reconstruction provides changes in the volume of the native joint directly related to the amplitude of the movement of the joint itself and inversely correlated with the amplitude of the movement of the endoprosthesis.

[The use of magnetic sensory system for mandibular movement patterns recording in patients after TMJ reconstruction]. / Ispol'zovanie magnitno-sensornoi sistemy dlya registratsii patternov dvizheniya nizhnei chelyusti u patsientov, perenesshikh rekonstruktsiyu visochno-nizhnechelyustnogo sustava.

OBJECTIVE: The aim of this study was to record mandibular kinematics in patients after total TMJ endoprosthesis using a magnetic sensory system. MATERIAL AND METHODS: The movement of the mandibular was examined in 10 patients who underwent TMJ reconstruction using total endoprostheses. The condylar range of motion, the angle of the transversal condylar inclination (TCI), the speed of joint movement (max S) and the stability distance between the position at the beginning of movement and at the end (Start/end) of TMJ prostheses and native joints were measured 1 week before surgery (T0) and 12 months after (T1). RESULTS: The study showed an increase in the linear distance of the native joint when opening (p=0.004), protrusion (p=0.004), balancing side (p=0.001) and max S of the native joint and endoprosthesis when opening (p=0.009), working side (p=0.008) and balancing side (p=0.001). A decrease in indicators was observed in the Start/end of the native joint when opening (p=0.035), protrusion (p=0.02), working side (p=0.004), as well as the endoprosthesis relative to the pathological joint when opening (p=0.028), protrusion (p=0.001) and balancing side (p=0.003). CONCLUSION: In the present study, in all cases, a slight but clearly defined translational shift on the side of the intervention was detected on the control condylograms, which can be referred to as «pseudotranslation¼.