ADEX Dental Biomaterials 2

Question 1

Which type of dental cement is most biocompatible and commonly used as a base under composite restorations?

Accepted Answer

Glass ionomer cement

Answer

Glass ionomer cement is highly biocompatible, bonds chemically to tooth structure, and releases fluoride, making it ideal as a base under composite restorations.

Question 2

What is the primary setting reaction of zinc phosphate cement?

Accepted Answer

Acid-base reaction between zinc oxide powder and phosphoric acid liquid

Answer

Zinc phosphate cement sets via an exothermic acid-base reaction where zinc oxide reacts with phosphoric acid to form zinc phosphate crystals.

Question 3

The term 'work time' in dental materials refers to:

Accepted Answer

Time available for manipulation after mixing before setting begins

Answer

Work time is the period after mixing during which the material can be manipulated and placed before it begins to set.

Question 4

Which property describes a material's ability to withstand repeated loading without fracturing?

Accepted Answer

Fatigue resistance

Answer

Fatigue resistance is a material's ability to endure cyclic or repeated stresses over time without failure.

Question 5

Resin-modified glass ionomer (RMGI) differs from conventional glass ionomer primarily because it:

Accepted Answer

Has a dual-cure mechanism including light-activated resin

Answer

RMGI incorporates HEMA resin monomers that allow light-curing in addition to the acid-base setting reaction of conventional glass ionomer.

ADEX - Dental Hygiene Exam Practice Test

ADEX - Dental Hygiene Exam Practice Test

ADEX Dental Biomaterials 2