NEETMDS.com -Dental Materials- demo

1 Dental Materials

Which material has the highest fracture toughness among the following?
1) Admixed amalgam
2) Light-cured glass ionomer
3) Hybrid composite
4) Cermet

Option 1

Option 2

Light-cured glass ionomer has a fracture toughness of 1.37 MPa.m%, which is higher than the other listed materials.

Option 3

Option 4

2 Dental Materials

What is the typical range of pH for acidic dental cements?
1) pH > 7
2) pH 7-10
3) pH 4-7
4) pH < 4

Option 1

Option 2

Option 3

Option 4

Acidic dental cements typically have a pH less than 7.

3 Dental Materials

Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of

1) Chromium
2) Indium
3) Iridium
4) Palladium

Option 1

Option 2

Option 3

The term equiaxed refers to the fact that three dimensions of each grain are similar. In dendritic structure, grains are elongated. Dendritic micro structures are not desirable for cast dental alloys, reason being the inter dendritic regions can serve as sites for
crack propagation.

Addition of about 1 wt% of ruthenium, Iridium or rhenium as grain refiners makes modern dental noble metal casting alloys as equiaxed microstructures.

Option 4

4 Dental Materials

What is the effect of pH on the bond strength of zinc polycarboxylate cement?
1) High pH increases bond strength.
2) Low pH increases bond strength.
3) pH has no effect on bond strength.
4) High pH decreases bond strength.

Option 1

Option 2

The bond strength is influenced by the acidity; a lower pH can enhance the bond strength.

Option 3

Option 4

5 Dental Materials

What is the typical average particle size of powered gold used in dental restorations?

1) 15 ?ms
2) 10 ?ms
3) 5 ?ms
4) 20 ?ms

Option 1

The average particle size of powered gold used in dental restorations is 15 ?ms. This size allows for the gold to be manipulated and condensed properly within the cavity preparation to achieve the desired restorative outcome.

Option 2

Option 3

Option 4

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