MFDS Dental Materials 3

Question 1

Which bonding agent generation first introduced self-etching primers to eliminate the separate acid-etch step?

Accepted Answer

6th generation

Answer

3rd generation

Answer

4th generation

Answer

5th generation

Question 2

The Vickers hardness of enamel is approximately:

Accepted Answer

343 VHN

Answer

50 VHN

Answer

200 VHN

Answer

600 VHN

Question 3

Which type of gypsum product has the highest compressive strength?

Accepted Answer

Die stone (Type IV)

Answer

Plaster of Paris (Type II)

Answer

Dental stone (Type III)

Answer

Orthodontic plaster (Type I)

Question 4

What causes the 'creep' of dental amalgam restorations at amalgam margins?

Accepted Answer

Time-dependent plastic deformation under occlusal load

Answer

Galvanic corrosion

Answer

Secondary caries

Answer

Thermal expansion

Question 5

Which impression material is most susceptible to tearing in thin cross-sections?

Accepted Answer

Condensation silicone

Answer

Polyvinyl siloxane (PVS)

Answer

Polyether

Answer

Addition silicone

Question 6

Which characteristic of zirconia makes it suitable for high-load dental restorations?

Accepted Answer

Transformation toughening

Answer

Translucency

Answer

Low thermal expansion

Answer

Radiolucency