This trial is planned to estimate the size of nasotracheal tube (NTT) by calculating the diameter of both nasal cavity in radiological images of nose (CT scan/MRI) at the level below the inferior turbinate and floor of nose in coronal planes. Smallest diameter will be considered to calculate the outer diameter of NTT, hence the size .

The planned trial will estimate the size of nasotracheal tube (NTT) by calculating the diameter of both nasal cavity in radiological images of nose (CT scan/MRI) at the level below the inferior turbinate and floor of nose at different levels in coronal planes. Smallest diameter will be considered to calculate the outer diameter of NTT, hence the size. The side of nasotracheal intubation will be decided after view the radiological images and the estimated size of NTT will be used. Finally the ease of intubation and complications will be recorded.

Inclusion Criteria:

1. patients requiring nasal intubation for oromaxillofacial surgeries

   Exclusion Criteria:

   • 1. Midface instability

2. Coagulopathy

3. Suspected basilar skull fractures

4. Large nasal polyps

5. Suspected nasal foreign bodies

6. Recent nasal surgery

7. History of frequent episodes of epistaxis

8. Prosthetic heart valves (increased risk of bacteremia during the insertion).

9. Patients with deranged liver and renal functions.

oncosurgical patients with oral malignancies who required nasotracheal intubation for COMMANDO surgeries.