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NEET MDS Quiz - Practice Test
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Practice Test

Dental Materials - 3 Questions

1
Dental Materials

Epoxy resins are compatible with which of the following impression material :

1) Polysulphide impression material
2) Polyether impression material
3) Agar
4) Alginate

📝 Explanation:

Epoxy resins
· Abrasion resistance is many times greater than gypsum
· More expensive
· Undergoes 0.1 – 0.2% shrinkage, thus their shrinkage is approximately equal to gypsum. This is less of problem with newer formulations & polyurethane resin.
· Their detail reproduction is better.
·  Hydrocolloids, polysulfides are not compatible with them.

2
Dental Materials

What is the difference between type I and type II glass ionomer cements?
1) Type I has a higher fluoride release
2) Type II has a higher compressive strength
3) Type I sets faster
4) Type II has better aesthetic properties

📝 Explanation:

Type II glass ionomer cements have a higher compressive strength, while Type I is often used for better aesthetics.

3
Dental Materials

What is the primary cause of delayed expansion in zinc-containing low-copper or high-copper amalgams?

1) Contamination by oxygen during trituration.
2) Contamination by water during trituration or condensation.
3) Over-trituration.
4) The presence of the ?2 phase.

📝 Explanation:

A large expansion can take place if the amalgam is contaminated by moisture during trituration or condensation, known as delayed expansion or secondary expansion.

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