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TMJ & TMD: What’s the Difference?
People commonly mistake referring to conditions affecting the jaw as “TMJ”. TMJ actually refers to the jaw joint itself, or the temporomandibular joint. The correct reference to conditions limiting or affecting the natural function of the jaw is TMD, or temporomandibular disorder. TMD interferes with the normal movement of the jaw, limiting or restricting opening and/or closing of the mouth, which can affect talking, eating, and/or yawning. TMD is so common a disorder that current statistics has it affecting more than 10 million people in the US. TMD affects more women than men, and is more common among people aged 20 to 40.
Causes for TMD vary greatly. The most common is the result of chronic grinding, excessive jaw clenching, jaw locking due to the jaw muscles going into spasm from the mouth being open too long (commonly seen after extensive dental work), and poor teeth alignment (called malocclusion) that may also require braces, mouth guards or mouth splints. Less common is direct forceful trauma (bruise or fracture) to the jaw itself, and even after healing, joint pain and stiffness may result.
Poor posture plays a big role in TMD causing strain to the jaw and neck structures. Issues with the neck play a significant role in TMD. Not every person with a neck problem has TMD, but most people experiencing TMD have issues with their neck. Arthritis in the jaw may result from TMD or be a cause of TMD resulting in painful inflammation. And surgeries to the face and especially to the jaw may restrict joint mobility resulting in TMD.