The patient with painful restriction of jaw movements showed CT and MRI of TMJ signs of on-reducing disk displacement of the right TMJ and secondary arthrosis. Signs of occlusion obstacle and compression of the right TMJ structures have been revealed by studying of diagnostic models, MPI, investigation of TMJ with KAVO Arcus Digma II system. The etiological factor proved to be th dystopia of 4.8. Complete recovery of the TMJ function has been noted after removal of tooth 4.8. CT and MRI of TMJ, investigation of occlusion are indicated for patients with non-reducing disk displacement of TMJ. Malposition of third molar can lead to development of internal derangements of TMJ.
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