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NEET MDS Quiz - Practice Test

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Practice Test

Dental Materials - 3 Questions

1
Dental Materials

What is the significance of the load deflection rate in orthodontic wires?

1) Low load deflection wires are preferred for large tooth movements.
2) High load deflection wires are preferred for large tooth movements.
3) The load deflection rate does not affect wire selection.
4) The load deflection rate determines the force applied during wire bending.

πŸ“ Explanation:

In orthodontics, wires with a low load deflection rate are typically preferred for areas requiring large tooth movements because they provide a more constant force as the tooth moves and the appliance is deactivated. This constant force is beneficial for controlling the rate of tooth movement.

2
Dental Materials

What is the primary advantage of using the frozen slab technique with zinc phosphate cement?
1) It increases the working time.
2) It decreases the setting time.
3) It increases the mechanical properties.
4) It changes the pH of the cement.

πŸ“ Explanation:

The frozen slab technique increases the working time of zinc phosphate cement by allowing more moisture to condense on the cool glass slab.

3
Dental Materials

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

πŸ“ Explanation:

After an amalgam restoration has been carved, it is important to lightly burnish the surface because burnishing increases the amalgam’s resistance to corrosion

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