Final Answer:
Bruxism is the most common stress-related cause of temporomandibular joint (TMJ) malfunction, characterized by teeth grinding or clenching. Thus the correct option is A.
Step-by-step explanation:
Bruxism, characterized by teeth grinding or clenching, is the most common stress-related cause of temporomandibular joint (TMJ) malfunction. The constant pressure and strain placed on the joint during bruxism can lead to TMJ disorders.
Bruxism, often a subconscious response to stress or anxiety, results in excessive pressure on the TMJ. This repetitive action can strain the muscles, ligaments, and the joint itself, leading to pain, stiffness, and dysfunction.
Over time, untreated bruxism can exacerbate TMJ issues, causing discomfort and affecting jaw movement. Managing stress and seeking treatment for bruxism can help alleviate TMJ-related problems by reducing the strain placed on the joint and associated structures.
Therefore, the correct option is A.