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

Zinc phosphate cement

Answer

Calcium hydroxide

Answer

Zinc oxide eugenol

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

To improve marginal seal

Answer

To increase retention form

Answer

To etch the dentin surface

Question 3

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

Accepted Answer

Deep and narrow, retaining plaque and debris

Answer

Shallow and self-cleansing

Answer

Broad and easy to access with a toothbrush

Answer

Already showing early carious lesions visible on radiograph

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

Calcium hydroxide

Answer

Glass ionomer

Answer

Resin-modified glass ionomer

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

Faster polymerization

Answer

Sealant discoloration

Answer

Increased fluoride release

Question 6

Dentin bonding agents used under composite restorations serve primarily to:

Accepted Answer

Seal the smear layer and bond resin to tooth structure

Answer

Replace the need for a base or liner entirely

Answer

Stimulate reparative dentin formation

Answer

Neutralize acid from composite resins

Question 7

Which of the following is a characteristic of zinc oxide eugenol (ZOE) as a temporary base?

Accepted Answer

Sedative effect on the pulp due to eugenol

Answer

High compressive strength suitable under amalgam

Answer

Fluoride release similar to glass ionomer

Answer

Compatibility with all resin composite systems