The purpose of this study is to determinate if there is a difference in performance provided by three laryngoscope blades: plastic single use, metallic single use and metallic reusable blades.

Primary outcome: success of intubation at the first attempt

Secondary outcomes: quality of laryngeal exposition (Cormack and Lehanne modify grade), duration to success intubation, Intubation difficult Scale and result of intubation procedure

Inclusion Criteria:

• patient age over 18 who need general anesthesia with orothracheal intubation

Exclusion Criteria:

• patient age under 18 or major assist
• presence of upper airway malformation or abnormality
• cervical or facial trauma
• previous difficult intubation known
• no use of curare
• Body Mass Index over 30kg/m2 if crush induction use