Which finding would most strongly suggest a non-TMD diagnosis?

Which finding would most strongly suggest a non-TMD diagnosis?

• A. Unilateral facial paralysis
• B. Jaw joint noise
• C. Limited mouth opening
• D. Tinnitus

Answer: (A)

The key idea is that true TMD signs are localized to the jaw and masticatory muscles, not to facial nerve function. TMD typically causes jaw pain or tenderness, joint noises during movement, and sometimes limited mouth opening; tinnitus can occur but is not a definitive non-TMD sign. Unilateral facial paralysis, on the other hand, indicates weakness of the facial nerve (cranial nerve VII) affecting muscles of facial expression on one side. That presentation points to a neurologic or otologic process such as Bell palsy or a central lesion, not a primary TMJ disorder. So this finding most strongly suggests a non-TMD diagnosis.

The key idea is that true TMD signs are localized to the jaw and masticatory muscles, not to facial nerve function. TMD typically causes jaw pain or tenderness, joint noises during movement, and sometimes limited mouth opening; tinnitus can occur but is not a definitive non-TMD sign. Unilateral facial paralysis, on the other hand, indicates weakness of the facial nerve (cranial nerve VII) affecting muscles of facial expression on one side. That presentation points to a neurologic or otologic process such as Bell palsy or a central lesion, not a primary TMJ disorder. So this finding most strongly suggests a non-TMD diagnosis.