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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 primary function of a light-curing unit in the polymerization of resin-based materials?
1) To generate heat for setting.
2) To activate the photosensitizer and initiate the polymerization reaction.
3) To accelerate the chemical reaction.
4) To increase the viscosity of the material.

📝 Explanation:

Light-curing units emit light at specific wavelengths that are absorbed by the photosensitizer in the resin, triggering the free radical polymerization process and setting the material.

2
Dental Materials

How is platinized gold foil formed?

1) By mixing gold and platinum powders and then beating them
2) By rolling gold and platinum sheets together to form a laminated foil
3) By plating gold onto a platinum substrate
4) By fusing a platinum rod with a gold ingot

📝 Explanation:

Platinized gold foil is a combination of gold and platinum where 15% of the content is platinum. It is produced by rolling layers of gold and platinum together to achieve the desired thickness and distribution of the platinum within the gold foil. This process creates a homogeneous mixture that enhances the hardness and wear resistance of the restoration, making it suitable for high-stress areas like incisal edges and cusp tips.

3
Dental Materials

What is the ADA specification for the gelation temperature of agar-agar hydrocolloids?
1) It should not be less than 32C
2) It should be exactly 32C
3) It should be more than 32C
4) There is no specific ADA specification for gelation temperature

📝 Explanation:

The American Dental Association (ADA) Specification-11 states that the gelation temperature should not be less than 32C to ensure proper setting and avoid distortion of the impression.

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