Macrotrauma to the craniofacial region can precipitate TMD; which of the following is an example?

• A. Blow to the chin
• B. Chronic sleep disturbance
• C. Low-impact repetitive chewing
• D. Soft tissue massage

Answer: (A)

Macrotrauma means a single, high-force event that injures the jaw structures. A direct blow to the chin fits this because the impact is transmitted through the mandible to the temporomandibular joint, which can disrupt the articular disc, ligaments, or condyle and trigger TMD symptoms like pain and limited movement.

Chronic sleep disturbance relates more to sleep-related parafunctional activity that can contribute to TMD over time, not an acute traumatic event. Low‑impact repetitive chewing causes microtrauma from repeated use rather than a single major injury. Soft tissue massage is a therapeutic technique, not a traumatic precipitant of TMD.