EFDA Bases, Liners, and Sealants 2

Question 1

Which liner material releases fluoride ions to help prevent secondary caries beneath a restoration?

Accepted Answer

Glass ionomer liner

Answer

Glass ionomer liners release fluoride, which provides ongoing anticaries protection at the tooth-restoration interface.

Question 2

What is the primary purpose of placing a base under a deep amalgam restoration?

Accepted Answer

To provide thermal insulation and pulpal protection

Answer

A base provides thermal insulation to protect the pulp from temperature changes conducted through the metal restoration.

Question 3

A pit and fissure sealant is indicated when the fissure morphology is:

Accepted Answer

Deep and narrow, retaining plaque and debris

Answer

Deep, narrow pits and fissures that cannot be cleaned by toothbrushing are the primary indication for sealant placement.

Question 4

Which material is contraindicated as a liner directly over a pulp exposure because of its low pH?

Accepted Answer

Zinc phosphate cement

Answer

Zinc phosphate cement has a very low initial pH (around 3.5) that can cause pulpal irritation and is contraindicated near direct pulp exposures.

Question 5

When applying a resin sealant, moisture contamination before light curing will most likely cause:

Accepted Answer

Poor adhesion and early sealant loss

Answer

Moisture contamination disrupts the bond between the etched enamel and the resin sealant, leading to microleakage and early failure.

(EFDA) Expanded Function Dental Auxiliary Practice Test