NBDE Oral Surgery 2

Question 1

Which classification system is most commonly used to assess the predicted difficulty of impacted mandibular third molar removal?

Accepted Answer

Pell and Gregory classification

Answer

The Pell and Gregory classification evaluates the depth of impaction relative to the occlusal plane and the space between the second molar and ramus, predicting surgical difficulty.

Question 2

During extraction of the maxillary first molar, oroantral communication is a recognized risk primarily because:

Accepted Answer

The apices of the roots are in close proximity to the floor of the maxillary sinus

Answer

The roots of the maxillary first molar have a close anatomical relationship with the floor of the maxillary sinus, making inadvertent sinus perforation a risk during extraction.

Question 3

The Caldwell-Luc procedure is a surgical approach primarily used to access which anatomical structure?

Accepted Answer

Maxillary sinus

Answer

The Caldwell-Luc approach creates an opening into the maxillary sinus through the canine fossa (anterior wall) to treat chronic sinusitis, remove foreign bodies, or repair oroantral fistulae.

Question 4

The correct target landmark for the standard inferior alveolar nerve block is approximately:

Accepted Answer

10 mm above the mandibular occlusal plane, medial to the pterygomandibular raphe

Answer

The needle is directed approximately 10 mm above the mandibular occlusal plane, medial to the pterygomandibular raphe, aiming at the mandibular foramen on the lingual aspect of the ramus.

Question 5

A patient develops trismus and dysphagia 2 days after mandibular molar extraction. Which space infection is most likely responsible?

Accepted Answer

Pterygomandibular space abscess

Answer

Pterygomandibular space infection causes trismus (due to medial pterygoid muscle involvement) and dysphagia (due to proximity to the lateral pharyngeal wall), and typically follows lower molar infections.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Oral Surgery 2