ORE Part 2 Endodontics 3

Question 1

What is the recommended treatment for an immature permanent tooth with pulp necrosis and an open (blunderbuss) apex?

Accepted Answer

Apexification with calcium hydroxide or a single-visit MTA apical plug

Answer

Conventional root canal obturation with warm gutta-percha

Answer

Extraction and implant placement once growth is complete

Answer

Pulpotomy with calcium hydroxide and monitoring

Question 2

Which root of the maxillary first molar most commonly contains two root canals, making it the most clinically significant anatomical variant?

Accepted Answer

Mesiobuccal root

Answer

Palatal root

Answer

Distobuccal root

Answer

All three roots with equal frequency

Question 3

What is the typical outline form of the access cavity prepared for a maxillary central incisor?

Accepted Answer

Triangular in the incisal third of the lingual surface

Answer

Oval, centred over the cingulum

Answer

Rectangular, extending from cingulum to incisal edge

Answer

Circular at the junction of the middle and incisal thirds

Question 4

How does internal root resorption appear on a periapical radiograph?

Accepted Answer

Well-defined oval or round radiolucent enlargement within the root canal

Answer

Periapical radiolucency at the root tip

Answer

Irregular shortening and blunting of the root apex

Answer

Radiopaque deposit within the pulp chamber

Question 5

What is the recommended final irrigation sequence to remove the smear layer and ensure effective disinfection before obturation?

Accepted Answer

NaOCl → EDTA → NaOCl

Answer

Saline → NaOCl → EDTA

Answer

EDTA → NaOCl → Chlorhexidine

Answer

Chlorhexidine → EDTA → Saline

Question 6

What is the clinical significance of the apical constriction in endodontic treatment?

Accepted Answer

It is the ideal terminus for both canal preparation and obturation

Answer

It marks the external surface of the root at the anatomical apex

Answer

It identifies where coronal flaring should terminate

Answer

It represents the cemento-enamel junction of the root

Question 7

In a replanted avulsed permanent tooth where extra-oral dry time exceeded 60 minutes, which type of root resorption is the most likely long-term sequela?

Accepted Answer

External replacement resorption (ankylosis)

Answer

Internal inflammatory resorption

Answer

External cervical resorption

Answer

External surface resorption