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

Apexification creates an apical barrier using calcium hydroxide dressings over time or a single-visit MTA plug, allowing obturation of a canal that cannot otherwise be adequately sealed.

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

The mesiobuccal root of the maxillary first molar has a second canal (MB2) in approximately 60–95% of cases, and missing this canal is a common cause of endodontic failure.

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

The access cavity for a maxillary central incisor is triangular in outline and placed in the incisal third of the lingual surface, reflecting the shape of the wide incisal pulp horn.

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

Internal resorption appears as a well-defined, symmetrical, oval or round radiolucent widening of the root canal lumen caused by clastic activity originating from within the pulp.

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

NaOCl first dissolves organic debris, EDTA then chelates the inorganic smear layer component, and a final NaOCl flush disinfects the clean dentinal surface before obturation.

ORE Part 2 Practice Test

ORE Part 2 Practice Test

ORE Part 2 Endodontics 3