ADEX Dental Biomaterials 5

Question 1

What does the term 'wettability' mean in the context of dental adhesive materials?

Accepted Answer

The ability of a liquid material to spread over and contact a surface

Answer

Wettability describes how well a liquid spreads across a surface; materials with low contact angles spread readily, promoting intimate contact and adhesion.

Question 2

Amalgam creep refers to:

Accepted Answer

Slow plastic deformation of amalgam under sustained compressive load

Answer

Creep in amalgam is time-dependent plastic deformation that occurs under sustained compressive stress, which can lead to overhanging margins and marginal breakdown.

Question 3

Which component of a dentin bonding system is responsible for penetrating and sealing the dentinal tubules?

Accepted Answer

Primer

Answer

The primer contains hydrophilic monomers that penetrate the demineralized collagen network and dentinal tubules to create a hybrid layer and resin tags.

Question 4

A dental material is described as having high 'resilience.' This means the material:

Accepted Answer

Can absorb elastic strain energy without permanent deformation

Answer

Resilience is the ability of a material to absorb energy elastically (within the proportional limit) and return to its original shape upon removal of the load.

Question 5

Which characteristic of gypsum products determines their final strength: dental plaster (Type II) vs. die stone (Type IV)?

Accepted Answer

Type IV uses alpha-hemihydrate with lower water-to-powder ratio, producing denser crystals

Answer

Die stone (Type IV) uses alpha-hemihydrate crystals that are denser and more regular in shape, requiring less water per gram and producing a denser, stronger set material than plaster's beta-hemihydrate.

ADEX - Dental Hygiene Exam Practice Test

ADEX - Dental Hygiene Exam Practice Test

ADEX Dental Biomaterials 5