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

Chlorhexidine 2%

Answer

EDTA 17%

Answer

Normal saline

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

To improve visibility of the operating field

Answer

To retract soft tissues away from the tooth

Answer

To reduce patient anxiety during the procedure

Question 3

Which feature best distinguishes symptomatic irreversible pulpitis from reversible pulpitis?

Accepted Answer

Spontaneous pain and lingering pain after stimulus removal

Answer

Sharp pain on cold stimulation

Answer

Mild aching aggravated by biting

Answer

Sensitivity to sweet foods only

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

By calculating the tooth length from a digital radiograph

Answer

By detecting temperature changes at the canal terminus

Answer

By measuring the resistance of dentin to file penetration

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

To kill anaerobic bacteria within the root canal

Answer

To dissolve necrotic organic tissue

Answer

To bleach discoloured dentine tubules

Question 6

Which cells are responsible for producing reactionary (secondary) dentine in response to pulpal irritation?

Accepted Answer

Odontoblasts

Answer

Cementoblasts

Answer

Ameloblasts

Answer

Fibroblasts

Question 7

What is the most appropriate immediate management for an acute apical abscess with spreading cellulitis and systemic signs of infection?

Accepted Answer

Drainage, systemic antibiotics, and definitive endodontic treatment or extraction

Answer

Definitive root canal treatment in a single visit

Answer

Analgesics only and review in 48 hours

Answer

Prescribe antibiotics alone without intraoral intervention