ABE Endodontic Materials 3

Question 1

EDTA is used as an endodontic irrigant primarily for its ability to:

Accepted Answer

Remove the smear layer by chelating calcium from dentin

Answer

EDTA chelates calcium ions from dentinal hydroxyapatite, effectively removing the inorganic component of the smear layer.

Question 2

The working length of a nickel-titanium rotary file is typically confirmed using:

Accepted Answer

Electronic apex locators and radiographic confirmation

Answer

A combination of electronic apex locators and periapical radiographs provides the most accurate and reliable working length determination.

Question 3

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

Accepted Answer

Sodium hypochlorite 5.25%

Answer

Sodium hypochlorite is the only endodontic irrigant with tissue-dissolving capability, making it superior for removing pulp remnants.

Question 4

Biodentine differs from ProRoot MTA primarily in its:

Accepted Answer

Much faster setting time due to calcium chloride accelerator

Answer

Biodentine contains calcium chloride as an accelerator in its liquid component, reducing setting time to approximately 12 minutes versus several hours for MTA.

Question 5

The alpha phase of gutta-percha differs from the beta phase in that it:

Accepted Answer

Is found in the naturally occurring form in the Palaquium tree

Answer

Alpha-phase gutta-percha occurs naturally in the Palaquium tree and has a higher melting point, while beta-phase is used in clinical endodontic cones.

(ABE) American Board of Endodontics Practice Test

(ABE) American Board of Endodontics Practice Test

ABE Endodontic Materials 3