ABE Clinical Endodontics 2

Question 1

A patient presents with a maxillary first molar requiring retreatment. CBCT reveals a separated instrument in the apical third of the MB2 canal. What is the most appropriate initial management?

Accepted Answer

Bypass the fragment and obturate around it if periapical healing is present

Answer

When periapical pathology is absent and bypassing a separated instrument is possible, obturation around it is a viable and often successful approach.

Question 2

Which irrigant is most effective at dissolving necrotic pulp tissue remnants in the root canal system?

Accepted Answer

Sodium hypochlorite 5.25%

Answer

Sodium hypochlorite is the only endodontic irrigant capable of dissolving organic tissue, making it the gold standard for pulp tissue dissolution.

Question 3

A patient has a sinus tract traced to a maxillary lateral incisor with a normal periodontal probing depth but a non-vital pulp. What is the most likely diagnosis?

Accepted Answer

Pulp necrosis with chronic apical abscess

Answer

A sinus tract traced to a tooth with pulp necrosis and normal periodontal probing indicates a chronic apical abscess of endodontic origin.

Question 4

During instrumentation of a mandibular molar, the working length suddenly increases by 3 mm. This most likely indicates:

Accepted Answer

Apical perforation

Answer

A sudden increase in working length during instrumentation is the classic sign of an apical perforation.

Question 5

Which pulp capping material is considered the current gold standard for direct pulp capping in a mature permanent tooth?

Accepted Answer

Mineral trioxide aggregate (MTA)

Answer

MTA is considered the current gold standard for direct pulp capping due to its superior biocompatibility, sealing ability, and dentinal bridge formation.

(ABE) American Board of Endodontics Practice Test

(ABE) American Board of Endodontics Practice Test

ABE Clinical Endodontics 2