What role does bruxism play in TMD pathophysiology?

What role does bruxism play in TMD pathophysiology?

• A. It can contribute to muscle hyperactivity, microtrauma to TMJ structures, and pain; often associated with daytime clenching and nighttime grinding.
• B. It reduces muscle activity and relieves pain.
• C. It has no relation to TMD.
• D. It only affects teeth, not joint tissues.

Answer: (D)

Bruxism is a parafunctional jaw muscle activity that increases the forces exerted on the masticatory system. This heightened muscle activity can cause muscle hyperactivity and transmit excess load to TMJ and surrounding structures, leading to microtrauma of muscles, ligaments, and the articular disc, which manifests as pain and dysfunction. It often occurs with both daytime clenching and nighttime grinding, so its impact spans both muscular and joint tissues, not just the teeth. The option describing bruxism as contributing to muscle hyperactivity, microtrauma to TMJ structures, and pain—and noting its association with daytime clenching and nighttime grinding—best reflects its role in TMD pathophysiology. The other statements contradict what bruxism does or imply it affects only teeth, which isn’t consistent with how parafunctional activity influences the TMJ and masticatory muscles.

Bruxism is a parafunctional jaw muscle activity that increases the forces exerted on the masticatory system. This heightened muscle activity can cause muscle hyperactivity and transmit excess load to TMJ and surrounding structures, leading to microtrauma of muscles, ligaments, and the articular disc, which manifests as pain and dysfunction. It often occurs with both daytime clenching and nighttime grinding, so its impact spans both muscular and joint tissues, not just the teeth. The option describing bruxism as contributing to muscle hyperactivity, microtrauma to TMJ structures, and pain—and noting its association with daytime clenching and nighttime grinding—best reflects its role in TMD pathophysiology. The other statements contradict what bruxism does or imply it affects only teeth, which isn’t consistent with how parafunctional activity influences the TMJ and masticatory muscles.