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The temporomandibular joint (TMJ) is the hinge joint that connects the lower jaw (mandible) to the temporal bone of the skull. Temporomandibular disorders (TMD) occur as a result of problems with the jaw, jaw joint, and surrounding facial muscles that control chewing and moving the jaw.
This joint is immediately in front of the ear on each side of your head. The joints are flexible, allowing the jaw to move smoothly up and down and side to side and enabling you to talk, chew, and yawn. Muscles attached to and surrounding the jaw joint control its position and movement.
What Causes TMD?
The cause of TMD is not clear, but dentists believe that symptoms arise from problems with the muscles of the jaw or with the parts of the joint itself.
Injury to the jaw, temporomandibular joint, or muscles of the head and neck such as from a heavy blow or whiplash can cause TMD. Other possible causes include:
What Are the Symptoms of TMD?
People with TMD can experience severe pain and discomfort that can be temporary or last for many years. More women than men experience TMD and TMD is seen most commonly in people between the ages of 20 and 40.
Common symptoms of TMD include:
How Is TMD Diagnosed?
Because many other conditions can cause similar symptoms including a toothache, sinus problems, arthritis, or gum disease your dentist will conduct a careful patient history and clinical examination to determine the cause of your symptoms.
He or she will examine your temporomandibular joints for pain or tenderness; listen for clicking, popping or grating sounds during jaw movement; look for limited motion or locking of the jaw while opening or closing the mouth; and examine bite and facial muscle function. Sometimes panoramic X-rays will be taken. These full face X-rays allow your dentist to view the entire jaws, TMJ, and teeth to make sure other problems aren’t causing the symptoms. Sometimes other imaging tests, such as magnetic resonance imaging (MRI) or a computer tomography (CT), are needed. The MRI views the soft tissue such as the TMJ disc to see if it is in the proper position as the jaw moves. A CT scan helps view the bony detail of the joint.
Your dentist may decide to send you to an oral surgeon (also called an oral and maxillofacial surgeon) for further care and treatment. This oral healthcare professional specializes in surgical procedures in and about the entire face, mouth and jaw area.
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