TMJ
Disc Displacement Disorders
Temporomadibular Disorder
TMD
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Temporomandibular disorder (TMD) is a condition affecting the movement of the mandible. It's not usually serious and generally gets better on its own. Symptoms of temporomandibular disorder include stiffness and pain around the jaw and a clicking or grinding noise when moving the jaw to speak or eat.
Though it usually gets better on its own. You can ease pain with painkillers, ice packs and gentle massage.
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NHS
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Temporomandibular Disorders
This summary video shows some 3D animated models with temporomandibular disorders including disc displacement with reduction, disc displacement without reduction & deflection.
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Disc Displacement With Reduction
Disc displacement with reduction is one of the most common intra-articular disorders of the temporomandibular joint, it is characterized by the progressive displacement of the articular disc against the mandibular condyle and the articular eminence, accompanied by clicking sounds or crepitus, pain, and in some cases presents a limitation of mandibular movement. Some treatment proposals include physical therapy and occlusal splints; if it is not treated in some cases it can become disc displacement without reduction.
Disc Displacement Without Reduction
Temporomandibular joint disc displacement without reduction (DDwoR) is a specific temporomandibular disorder that can cause TMJ pain and limited mouth opening (painful locking), sometimes called a “closed lock”. DDwoR can be acute or chronic depending on the duration of locking. Its incidence among TMD patients is estimated at 2% to 8%.
Deflection
Deflection of the mandible is movement away from the midline during opening without return to center during the movement. Deviation of the mandible is movement away from midline followed by a return to center and is often described as roughly a “C” or “S” pattern. This model shows deflection.
Deflection
Deviation
Dislocation of the Mandible
A 3D Model and Illustration
Temporomandibular joint (TMJ) dislocation occurs when the condyle of the jaw moves forward, out of its functional position within the glenoid fossa and posterior articular eminence into a position in front of these structures. This usually happens when the mouth opens too wide from yawning, eating or shouting. It then stretches the ligaments and muscles, provoking intense local orofacial pain.
Dislocation Reduction procedure
The standard treatment for acute TMJ dislocation is reduction of the mandible, a technique by which the dislocated jaw is pushed downward and backward into its normal position. TMJ reduction frequently takes place in emergency rooms under sedation or general anesthesia.
