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

6th generation adhesives introduced self-etching primers that simultaneously condition and prime without a separate phosphoric acid etch step.

Question 2

The Vickers hardness of enamel is approximately:

Accepted Answer

343 VHN

Answer

Enamel has a Vickers hardness of approximately 343 VHN, making it the hardest biological tissue in the human body.

Question 3

Which type of gypsum product has the highest compressive strength?

Accepted Answer

Die stone (Type IV)

Answer

Type IV die stone (high-strength dental stone) has the highest compressive strength due to the regular particle shape resulting from autoclaving.

Question 4

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

Accepted Answer

Time-dependent plastic deformation under occlusal load

Answer

Creep is time-dependent plastic deformation of amalgam under sustained occlusal stress, leading to marginal overhang and ditching over time.

Question 5

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

Accepted Answer

Condensation silicone

Answer

Condensation silicone (C-silicone) has lower tear strength and elastic recovery compared to addition silicone (A-silicone) and is more prone to tearing in fine detail areas.

MFDS Part 1 Practice Test

MFDS Part 1 Practice Test

MFDS Dental Materials 3