NDAEB Dental Materials and Equipment 3

Question 1

Which luting cement can cause pulpal irritation due to its highly acidic pH during the initial setting reaction?

Accepted Answer

Zinc phosphate cement

Answer

Zinc oxide eugenol cement

Answer

Glass ionomer cement

Answer

Resin-modified glass ionomer cement

Question 2

What is the PRIMARY advantage of using resin cement over zinc phosphate cement for cementing all-ceramic crowns?

Accepted Answer

It provides superior bond strength and tooth-matched esthetics

Answer

It is easier to remove if the crown needs to be replaced

Answer

It has a longer working time for difficult placements

Answer

It is less expensive and more widely available

Question 3

Calcium hydroxide is most commonly indicated for use as a:

Accepted Answer

Direct or indirect pulp capping material

Answer

Final luting agent for permanent crowns

Answer

Long-term temporary filling material

Answer

Base under amalgam restorations only

Question 4

Why is zinc phosphate cement mixed using a broad figure-eight motion on a cool glass slab?

Accepted Answer

To dissipate the exothermic heat and lengthen working time

Answer

To activate the catalyst and accelerate setting

Answer

To increase the final compressive strength

Answer

To prevent air bubble incorporation

Question 5

What is the primary function of a dentin bonding agent applied before placing a composite resin restoration?

Accepted Answer

To seal dentin tubules and create a hybrid layer bonding composite to dentin

Answer

To etch the enamel and create mechanical retention

Answer

To cure and harden the composite light-independently

Answer

To remove the smear layer without an acid etchant

Question 6

Eugenol-containing temporary cements should be AVOIDED when the planned final restoration is:

Accepted Answer

A composite resin restoration

Answer

A gold cast crown

Answer

A porcelain-fused-to-metal crown

Answer

An amalgam restoration

Question 7

Which mechanical property describes a dental material's ability to withstand REPEATED cyclic stress without fracturing over time?

Accepted Answer

Fatigue resistance

Answer

Hardness

Answer

Compressive strength

Answer

Elasticity