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NEET MDS Question Bank
 

1  Dental Material

Which of the following acids is commonly used for etching enamel surfaces? 1. Citric acid                                                     2. Hydrochloric acid 3. Phosphoric acid                                            4. Picric acid

 

2  Dental Material

Impression compound

1. has a high coefficient of thermal expansion

2. tends to warp at room temperature

3. is a thermoset material

4. displays higher flow properties when kneaded with water

 

3  Dental Material

Three types of expansion that are possible in an investment are 1. thermal expansion, hygroscopic expansion, and setting expansion 2. thermal expansion, casting expansion, and metal expansion 3. casting expansion, hygroscopic expansion, and thermal expansion 4. thermal expansion, hygroscopic expansion, and metal expansion

 

4  Dental Material

A zinc-containing amalgam that has been contaminated by moisture will manifest
A. higher setting expansion
B. a gross delayed expansion
C. reduced compressive strength
D. an increase in the amount of gamma phase
1. A and B
2. B and C
3. C
4. C and D

 

5  Dental Material

After an amalgam restoration has been carved, it is important to lightly burnish the surface because burnishing
1. moves the amalgam in such a way as to fill in voids and submarginal areas
2. changes the contour of the restoration
3. increases the amalgam’s resistance to corrosion
4. contributes a dull luster to the surface

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