INBDE Endodontics

Question 1

Which test is most reliable for diagnosing pulp necrosis?

Accepted Answer

Electric pulp test

Answer

The electric pulp test (EPT) is used to assess pulp vitality and is most reliable for identifying pulp necrosis; a necrotic pulp will show no response.

Question 2

The apical constriction (minor diameter) of the canal is located approximately:

Accepted Answer

0.5–1.0 mm coronal to the anatomic apex

Answer

The apical constriction, where the canal is narrowest, is located approximately 0.5–1.0 mm coronal to the anatomic apex and is the ideal endpoint for canal instrumentation.

Question 3

Sodium hypochlorite (NaOCl) is used as an irrigant in root canal therapy primarily because it:

Accepted Answer

Dissolves organic tissue and has broad antimicrobial activity

Answer

Sodium hypochlorite is the primary root canal irrigant due to its ability to dissolve pulp tissue and its potent antimicrobial activity against endodontic pathogens.

Question 4

Vertical root fracture is most commonly associated with:

Accepted Answer

Excessive lateral condensation during obturation

Answer

Excessive lateral condensation pressure during cold lateral compaction of gutta-percha is a major cause of vertical root fracture.

Question 5

Gutta-percha is primarily composed of which material?

Accepted Answer

Trans-polyisoprene (rubber), zinc oxide, and barium sulfate

Answer

Gutta-percha points consist primarily of trans-polyisoprene (gutta-percha resin), zinc oxide (filler), barium sulfate (radiopacifier), and waxes/resins.

INBDE - Integrated National Board Dental Exam Practice Test

INBDE - Integrated National Board Dental Exam Practice Test

INBDE Endodontics