[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.

[Three-dimensional assessment of positional changes of the mandibular condyles following orthognathic surgery]. / Trekhmernaya otsenka izmeneniya polozheniya sustavoobrazuyushchikh elementov nizhnei chelyusti v rezul'tate ortognaticheskoi operatsii.

THE AIM THE STUDY: This study aims to assess the postoperative condylar displacement after orthognathic surgery using three-dimensional analysis of computed tomography. MATERIAL AND METHODS: This retrospective study included 64 condyles from 32 patients with skeletal Class II (Group 1, n=16) and III (Group 2, n=16) deformities. All patients underwent a bimaxillary surgery. The three-dimensional CT images were evaluated to assess condylar displacement. RESULTS: The condyle exhibited mainly superior and lateral torque immediately after surgery. Posterior displaced condyles were found in two cases in group 1 (Class II malocclusion). CONCLUSION: The present study found the condyle displacement that can be mistaken as posterior displacement of condyle in analysis of sagittal sections of CT scans.

[Condylar displacement following orthognathic surgery]. / Dislokatsiya sustavnykh golovok nizhnei chelyusti v rezul'tate ortognaticheskoi operatsii.

The overview of the current literature in the research of mandibular condyle displacement after orthognathic surgeries was done. The correct postoperative mandibular condyle position is considered as one of the determinants of the stability of treatment results.

[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.