ORE Part 2 Endodontics

Question 1

Which irrigant is considered the gold standard for root canal disinfection due to its ability to dissolve organic tissue?

Accepted Answer

Sodium hypochlorite 2.5–5.25%

Answer

Sodium hypochlorite is the gold standard root canal irrigant because it has broad antimicrobial activity and is the only irrigant capable of dissolving necrotic pulp tissue.

Question 2

What is the primary reason for using a rubber dam during endodontic treatment?

Accepted Answer

To prevent instrument aspiration and maintain asepsis

Answer

The rubber dam isolates the tooth from oral flora to maintain asepsis and prevents potentially fatal aspiration of endodontic instruments.

Question 3

Which feature best distinguishes symptomatic irreversible pulpitis from reversible pulpitis?

Accepted Answer

Spontaneous pain and lingering pain after stimulus removal

Answer

Symptomatic irreversible pulpitis is characterised by spontaneous pain and pain that lingers for 30 seconds or more after removal of the stimulus, indicating irreversible pulpal damage.

Question 4

How does an electronic apex locator determine the working length of a root canal?

Accepted Answer

By measuring impedance between the file tip and oral mucosa

Answer

Electronic apex locators measure the electrical impedance between an instrument tip in the canal and an electrode placed on the oral mucosa, which changes predictably at the apical constriction.

Question 5

What is the primary function of EDTA in root canal treatment?

Accepted Answer

To remove the smear layer by chelating calcium ions from dentine

Answer

EDTA is a chelating agent that removes the smear layer produced during instrumentation by binding calcium ions from the inorganic dentine component.

ORE Part 2 Practice Test

ORE Part 2 Practice Test

ORE Part 2 Endodontics