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NEET MDS Quiz - Practice Test
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Dental Materials - 3 Questions

1
Dental Materials

What happens if the water temperature exceeds 50C during the mixing of gypsum products?
1) The setting reaction is accelerated.
2) The setting reaction is retarded.
3) No reaction occurs.
4) The material becomes less soluble.

📝 Explanation:

If the temperature of the water used to mix gypsum products exceeds 50C, it can slow down the setting reaction due to the reversible nature of the gypsum crystal formation at higher temperatures.

2
Dental Materials

What is the primary component that gives Ceromer its unique handling characteristics and contributes to its restorative perfection?

1) Ceramic fillers
2) Fluoride releasing fillers
3) Polymer matrix
4) Combination of ceramic fillers and fluoride releasing fillers

📝 Explanation:

Ceromer is a composite material that combines the benefits of glass ionomers and composite resins. The inclusion of ceramic fillers and fluoride releasing fillers in a polymer matrix gives Ceromer its unique handling properties and enhances its restorative capabilities.

3
Dental Materials

What is the typical refractive index range of bis-GMA and TEGDMA, and what happens when they are mixed in equal proportions?
1) 1.50 to 1.60 and increases.
2) 1.40 to 1.60 and decreases.
3) 1.55 for bis-GMA and 1.46 for TEGDMA, and a mixture yields approximately 1.50.
4) 1.50 for bis-GMA and 1.60 for TEGDMA, and a mixture yields approximately 1.55.

📝 Explanation:

The refractive indices of bis-GMA and TEGDMA are approximately 1.55 and 1.46, respectively, and when mixed in equal proportions, they provide a refractive index of around 1.50.

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