Postoperative Analgesia Following Wisdom Teeth Removal: Ropivacaine Versus Placebo

Inclusion Criteria: * The patient must have given his/her informed and signed consent * The patient must be insured or beneficiary of a health insurance plan * The patient is available for 3 months of follow-up * American Society of Anesthesiology (ASA) score of 1, 2 or 3 * Patient programmed for surgical removal of all 4 wisdom teeth, excluding all other teeth, under general anesthesia Exclusion Criteria: * The patient is participating in another study * The patient is in an exclusion period determined by a previous study * The patient is over 18 years old and under judicial protection, under tutorship or curatorship * The patient (or legal representative)refuses to sign the consent * It is impossible to correctly inform the patient * The patient is pregnant, parturient, or breastfeeding * Ineffective contraceptive * Addiction or chronic pain treated with morphine * Contra-indication for regional anesthesia (eg congenital or acquired coagulopathy, infection, allergy) * Contra-indication to local anesthetics, general anesthetics and analgesics used in the protocol. * Difficult cooperation, psychiatric disorders that could interfere with assessments * Hypersensitivity to ropivacaine or other local anesthetics with amide links * Contra-indication for the use of NaCl 0.9%: all states of sodium and water retention (especially heart failure, edema and ascites syndrome associated with cirrhosis)