NEET MDS Quiz - Practice Test

1

Dental Materials

What is the gelation temperature range of a reversible hydrocolloid?
1) 37�C - 50�C
2) 50�C - 70�C
3) 70�C - 100�C
4) 100�C - 120�C

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

The gelation temperature is the point at which the material transforms from a sol to a gel, which is critical for impression making.

2

Dental Materials

What is the typical setting expansion of a high expansion dental stone?
1) Less than 0.1%.
2) 0.1-0.2%.
3) 0.2-0.3%.
4) More than 0.3%.

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

High expansion dental stones are designed to expand more than typical dental stones to compensate for the contraction of other materials and ensure a precise fit for restorations.

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

Option 4

📝 Explanation:

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.

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