Maintaining the Head Extension by an Assistant Decreases Dental Contact

Maintaining the Head Extension by an Assistant Decreases Dental Contact Between Laryngoscope Blade and Maxillary Incisors During Direct Laryngoscopy

The purpose of this study is to determine whether the head extension by an assistant decreases dental contact between laryngoscope blade and maxillary incisors during direct laryngoscopy

Inclusion Criteria:

• patients undergoing surgery that requires general anesthesia

Exclusion Criteria:

• disease or injury of cervical spine
• dentoalveolar injury
• history of difficult intubation
• anatomical anomaly of face or airway