INBDE Endodontics 2

Question 1

Which material is most commonly used as an intracanal medicament between appointments in root canal therapy?

Accepted Answer

Calcium hydroxide

Answer

Calcium hydroxide is the most widely used intracanal medicament because its high pH (~12.5) is bactericidal, promotes periapical healing, and prevents reinfection between visits.

Question 2

What is the primary purpose of EDTA in root canal treatment?

Accepted Answer

Removal of the smear layer (chelation of inorganic components)

Answer

EDTA (ethylenediaminetetraacetic acid) chelates calcium ions in the smear layer and dentinal walls, removing the inorganic component to open dentinal tubules.

Question 3

A maxillary first molar most commonly has how many canals?

Accepted Answer

4

Answer

The maxillary first molar typically has 3 roots and most commonly 4 canals (2 in the mesiobuccal root — MB1 and MB2, 1 in the distobuccal, 1 in the palatal).

Question 4

Internal root resorption appears radiographically as:

Accepted Answer

A symmetric oval or round radiolucency within the root canal space

Answer

Internal resorption appears as a smooth, round-to-oval radiolucent enlargement within the root canal, caused by clastic cells activated within the pulp.

Question 5

What is the working length in endodontics?

Accepted Answer

The distance from a reference point to the apical constriction where instrumentation ends

Answer

Working length is the measured distance from an occlusal/incisal reference point to the apical stop (apical constriction), establishing the limit of instrumentation.

INBDE - Integrated National Board Dental Exam Practice Test

INBDE - Integrated National Board Dental Exam Practice Test

INBDE Endodontics 2