Effect of Weakening of Ipsilateral Depressor Anguli Oris on Smile Symmetry in Postparalysis Facial Palsy

What Is This Study About?

This study demonstrated that weakening the depressor anguli oris muscle (which pulls the corner of the mouth down) on the affected side improves smile symmetry in patients with post-paralytic facial palsy. The technique addresses a common cause of asymmetric smiling after nerve recovery.

Key Findings

• Selective weakening of the depressor anguli oris improved smile symmetry
• Effective for patients with post-paralytic syndrome who have recovered some movement
• Can be performed with botulinum toxin or selective neurectomy

What This Means for Patients

Patients with recovered but asymmetric smiles can achieve improved symmetry through this targeted approach, which addresses overactive muscles that pull the mouth corner downward.