ORE Part 2 Endodontics 2

Question 1

What is considered the most common biological cause of post-treatment endodontic failure?

Accepted Answer

Residual bacteria persisting within the root canal system

Answer

Residual bacteria surviving within the complex root canal anatomy after treatment is the primary biological cause of persistent periapical pathology and endodontic failure.

Question 2

Which obturation material remains the gold standard for filling root canals in conventional endodontic treatment?

Accepted Answer

Gutta-percha with a root canal sealer

Answer

Gutta-percha combined with a root canal sealer is the gold standard obturation material due to its biocompatibility, dimensional stability, radiopacity, and ease of removal if retreatment is required.

Question 3

What is a 'ledge' as a complication in endodontic treatment?

Accepted Answer

An artificial step created in the canal wall preventing further instrument progress

Answer

A ledge is an iatrogenic shelf or false pathway created on the canal wall, most often in curved canals, which prevents instruments from reaching the established working length.

Question 4

If a sodium hypochlorite injection accident occurs with extrusion beyond the apex, what is the most appropriate immediate management?

Accepted Answer

Stop irrigation immediately and manage pain and swelling conservatively

Answer

Immediate management involves stopping irrigation, providing pain relief, applying ice to reduce swelling, and monitoring; most cases resolve with conservative management, with hospital referral reserved for severe or progressive cases.

Question 5

What is the principle behind the step-back technique in root canal preparation?

Accepted Answer

Preparing the apex first then using progressively larger files coronally to create a taper

Answer

The step-back technique involves establishing the working length and preparing the apical third first, then 'stepping back' with successively larger files coronally to develop a funnel-shaped taper.

ORE Part 2 Practice Test

ORE Part 2 Practice Test

ORE Part 2 Endodontics 2