In soft tissue treatment for TMJ issues, which muscle is primarily targeted if there's pain upon loading?

• A. Temporalis
• B. Masseter
• C. Lateral pterygoid
• D. Medial pterygoid

Answer: (B)

In the context of TMJ issues, the masseter muscle is primarily targeted when there is pain upon loading because it plays a significant role in the elevation and compression of the jaw during chewing and biting. This muscle is one of the main muscles involved in mastication and can become overly tight due to excessive use or stress, resulting in pain upon loading.

When patients experience pain during activities that load the jaw, such as biting down or clenching, it often suggests that the masseter is involved. Manual therapy techniques or interventions aimed at the masseter can help alleviate tension and restore function, making it a primary focus for treatment in these scenarios.

While the other muscles listed, such as the temporalis, lateral pterygoid, and medial pterygoid, also contribute to jaw movement and can be implicated in TMJ disorders, the masseter is the most directly associated with pain experienced during loading activities due to its primary role in jaw function. Addressing this muscle can have a significant impact on reducing pain and improving overall TMJ function.