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NEET MDS Quiz - Practice Test
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Practice Test

All Subjects - 3 Questions

1
Dental Materials

What is the typical polymer-to-monomer ratio required for denture base resin?
1) 1:1
2) 2:1
3) 3:1
4) 4:1

📝 Explanation:

The accepted ratio of polymer to monomer for denture base resin is 3:1 volume, allowing sufficient wetting of the polymer particles.

2
Endodontics
Vertical condensation of gutta-percha 
 1. Used for both lateral and vertical canals
 2. Mainly used with step back
 3. Retrieval is more difficult & associated with root fractures
 4. All of the above

📝 Explanation:

Vertical condensation of gutta-percha is more difficult to retrieve and is associated with root fractures. This is because: 1) The thermoplasticized gutta-percha bonds more intimately with canal walls, 2) Heat application during condensation makes removal challenging, 3) Excessive force during condensation can cause vertical root fractures, 4) Dense packing requires aggressive instrumentation for removal, 5) The technique requires greater operator skill and carries higher risk of complications. While it can provide excellent seal, the difficulty of retreatment and risk of root fracture are significant disadvantages.

3
NEETMDS

Which property of composites is most affected by the size and number of fillers
1) Polymerization shrinkage
2) Thermal contraction
3) Thermal expamsion
4) Water sorption

📝 Explanation:

The amount of polymerization shrinkage in composite materials is directly related to the volume fraction of the polymer matrix; increasing the size and number of inorganic filler particles reduces the relative amount of polymer, thus decreasing overall shrinkage.

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