Dental Dental Materials

Question 1

Which type of dental material is classified as an irreversible hydrocolloid impression material?

Accepted Answer

Alginate

Answer

Agar

Answer

Polyvinyl siloxane

Answer

Polysulfide

Question 2

What is the primary purpose of a cavity liner placed in a deep preparation?

Accepted Answer

To provide pulp protection from chemical and thermal irritation

Answer

To improve aesthetics of the final restoration

Answer

To increase the retention of the restoration

Answer

To prevent marginal leakage

Question 3

Which gypsum product has the highest compressive strength and is used for dies?

Accepted Answer

Die stone (Type IV)

Answer

Plaster of Paris (Type I)

Answer

Model plaster (Type II)

Answer

Dental stone (Type III)

Question 4

What is the setting reaction of zinc phosphate cement?

Accepted Answer

Acid-base reaction between zinc oxide and phosphoric acid

Answer

Polymerization of resin monomers

Answer

Chelation reaction between polyacrylic acid and zinc oxide

Answer

Light activation of photoinitiators

Question 5

Which of the following composite filler types provides the best combination of strength and polishability?

Accepted Answer

Hybrid composite

Answer

Macrofill composite

Answer

Microfill composite

Answer

Nanofill composite

Question 6

What is the major advantage of glass ionomer cement over zinc phosphate cement?

Accepted Answer

Chemical adhesion to tooth structure and fluoride release

Answer

Higher compressive strength

Answer

Longer working time

Answer

Superior aesthetics

Question 7

Which component of dental amalgam is primarily responsible for its corrosion resistance?

Accepted Answer

Copper

Answer

Mercury

Answer

Tin

Answer

Zinc