Posterior dislocation of the mandible: causes, symptoms, diagnosis, treatment
Last reviewed: 23.04.2024
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Dislocations of the lower jaw posteriorly occur as a result of a stroke in the chin at the time of a small retraction of the jaw, with removal of the lower large molars with the use of great force, with convulsive yawning. As a result, the head of the lower jaw is placed between the mandibular fossa and the mastoid process of the temporal bone, under the lower wall of the osseous part of the auditory tube.
Sometimes the front (bony) wall of the external auditory canal is broken , which is manifested by the following signs:
- reduction of jaws;
- inability to open the mouth;
- chin chamfering posteriorly;
- disruption of contact between molar antagonists due to the fact that the lower incisors rest against the mucosa of the hard palate. With macroglossia, the posterior dislocation can lead to tongue laxity and difficulty breathing.
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Technique for eliminating the posterior dislocation of the jaw
The thumbs of the hands are inserted into the mouth of the mouth and placed on the outer surface of the alveolar processes of the wisdom teeth and on the oblique lines of the lower jaw. The other fingers cover the body of the jaw. Pressing the thumbs down and pushing the lower jaw forward the joint heads are set to the correct position. After eliminating the dislocation, use an immobilizing bandage for 2.5-3 weeks.
Outcomes of treatment are usually favorable, in some cases, some stiffness in the joint, usually eliminated by physiotherapy and mechanotherapy of the joint. Sometimes it is necessary to resort to arthroplasty due to the development of ankylosis of the temporomandibular joint.