[Depressor anguli oris sign (DAO) in facial paresis. How to search it and release the smile (technical note)].
BACKGROUND
After facial paralysis recovery, it is common to note a co-contraction between depressor anguli oris (DAO) muscle and zygomatic muscles. This DAO co-contraction will "obstruct" the patient's smile. The purpose of this technical note is to show how to find the DAO sign and how to free up the smile. TECHNICAL: This co-contraction between the zygomatic muscles and DAO research is placing a finger on marionette line, asking the patient to smile: we perceive a rope under the skin corresponding to the abnormal contraction and powerful DAO. A diagnostic test with lidocaine injection into the DAO can be performed to confirm the diagnosis. The treatment of pathological DAO's contraction can be by injection of botulinum toxin in the DAO, or by surgical myectomy. In all cases, a speech therapy complete the treatment.


CONCLUSIONS
The DAO sign is a semiological entity easy to find. His treatment releases smile without negative effect on the facial expression as the DAO is especially useful in the expression of disgust.
Service de chirurgie maxillofaciale, CHU de Caen, avenue Côte-de-Nacre, Caen, France.
D
D
Labbé
L
L
Bénichou
A
A
Iodice
J-P
JP
Giot
D019274:Botulinum Toxins, Type A / Q000008:administration & dosage*; D004210:Dissection / Q000379:methods*; D005152:Facial Muscles / Q000187:drug effects* / Q000503:physiopathology*; D005158:Facial Paralysis / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D007273:Injections, Intramuscular; D008046:Lip / Q000187:drug effects* / Q000503:physiopathology*; D009119:Muscle Contraction / Q000187:drug effects / Q000502:physiology*; D009122:Muscle Hypertonia / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy*; D009465:Neuromuscular Agents / Q000008:administration & dosage*; D012904:Smiling / Q000502:physiology*
D009465:Neuromuscular Agents; D019274:Botulinum Toxins, Type A