Alternative Names: Temporomandibular Disorder, TMD.
"TMJ" stands for temporomandibular joint, or the jaw joint. The TMJs are the small joints in front of each ear that attach the lower jaw (mandible) to the skull. They allow you to perform such functions as opening and closing your mouth, chewing, speaking, swallowing, etc.
TMJ disorder is collection of symptoms which result when the chewing muscles and jaw joints do not work together correctly. TMJ diseases and disorders refer to a complex and poorly understood set of conditions, manifested by pain the the area of the jaw and associated muscles and limitations in the ability to make the normal movements of speech, facial expression, eating, chewing, and swallowing. Conditions that routinely affect other joints in the body, such as arthritis and trauma, also affect the TM joint.
When normal relationships between the condyle, the disc, the fossa and the eminence are altered or distracted for whatever reason, the result is called "internal joint derangement". Internal derangement includes cartilage disc displacements, clicking, popping, stretched or torn ligaments, perforated discs, infection/inflammation of the capsule or tissues, and adhesions of the cartilage to the socket of the jawbone.
Medical research has not yet defined all the causes of the various TMJ diseases/disorders. Some patients report having TMJ symptoms following dental procedures, the insertion of a breathing tube prior to surgery, trauma, or oral habits such as clenching or grinding the teeth. Conditions that occur in other joints in the body, such as arthritis, can also precipitate or aggravate TMJ pain and dysfunction.
Pain lasting for a week or less may not require medical/dental attention. Popping and clicking sounds in the joint have been considered symptoms of a TMJ problem; however experts observe that many perfectly healthy joints make noise. Jaw noises unaccompanied by pain or decreased mobility do not mean you have a TMJ problem.
Those with the symptoms listed above often report additional ones as well, such as ringing in the ears, ear pain, diminished hearing, dizziness or vertigo, and visual disturbances. These symptoms may be a facet of TMJ disease or a different disease process occurring simultaneously.
People with TMJ implants are a subgroup of patients whose jaw problems led to surgery to replace all or part of the jaw joint. The devices failed in a large number of these patients who then experienced serious complications requiring further treatments and often additional surgeries. These patients have reported a variety of signs, symptoms and other medical problems, which may be related to their jaw implants and some of which may have occurred independently. The TMJ Association lists these symptoms because TMJ implant patients frequently report them:
These interventions include application of heat and cold, prolotherapy, injections of a local anesthetic into muscle trigger points, passive and active jaw exercises, medications such as muscle relaxants and anti-inflammatories, multivitamins, neuromuscular orthotics, biofeedback and acupuncture, transcutaneous electrical neural stimulation, coronoplasty, and cortisone injections.
Sometimes TMJ problems resolve over time with patients taking mild pain-relieving drugs and using heat, cold or other palliative measures. At present, there are more than 50 treatments in use ranging from very conservative, reversible therapies to more aggressive, invasive approaches. None of the surgical treatments for severe cases have been proven effective in long-term controlled clinical trials.
The Resultant Force Vector Technique is able to reduce abnormal muscle tension and to restore balance within the body by correcting bite and establishing physiological function of TMJ. Through this technique it is claimed that stress-related headaches have been relieved 90-95% of the time in the absence of complicating medical problems. Those suffering from weekly or daily headaches, who are also taking medications without knowing when the headaches will cease, should evaluate such alternatives.
Dr. Wesley Shankland, Past President of the American Academy of Craniofacial Pain recommends three criteria be satisfied before TM Joint surgery is tried. The criteria are:
Despite some patients experiencing symptomatic relief, others have suffered more after surgery. The procedure was irreversible and there was nothing much to do except medicate to control the pain. Because of the severity of pain and the side-effects of drugs, both patients and doctors struggled.
These days, better non-surgical techniques and drugs have been developed, and both surgeons and non-surgeons consider surgery as the last treatment modality option.
Post-surgical symptoms are categorized as "chronic pain symptoms" and must be treated/managed accordingly.
Missing teeth should be replaced in order to prevent shifting and therefore misalignment of the remaining teeth, which can lead to TMJ.
A study of twenty patients with tinnitus found that ten tested positive for TMJ dysfunction in all diagnostic tests used, and nine more tested positive to one or more of the diagnostic procedures. Only one patient of the twenty had no positive evidence of any jaw joint dysfunction. Dr. Morgan's findings were published in The Journal of Craniomandibular Practice. ["Tinnitus of TMJ Origin: A Preliminary Report," Vol.10, No.2]
Another research project was headed by Richard L. Goode, MD, professor of ENT and Head and Neck surgery at Stanford University's School of Medicine. Drs Morgan and Goode were able to establish the mechanical connection between the ossicles in the middle ear and the capsule and disk of the TMJ. ["The TMJ-Ear Connection", Journal of Craniomandibular Practice, Vol. 13, No.1).]
You may get an idea if the tinnitus is connected to your TMJ in some way, by:
Dental conditions such as a high filling or displaced teeth due to tooth loss can cause TMJ. When teeth shift due to earlier loss of teeth, this can result in tooth/jaw misalignment.
Although the link is not clear, stresses on the jaw caused by bruxism can lead to TMJ dysfunction. The muscles that stabilize the joint become fatigued from frequent clenching and/or grinding of teeth.
If the TMJ is affected by rheumatoid arthritis, it is usually one of the last joints involved. RA affects the TMJ in almost 20% of cases. Pain, swelling, and limited movement are the most common symptoms.
Improper denture support and function can upset the jaw mechanism if the teeth are not being properly aligned with the chewing muscles. This can, in serious cases, lead to a TMJ disorder.