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NEET MDS Quiz - Practice Test
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Practice Test

Dental Materials - 3 Questions

1
Dental Materials

Porcelain binds to metal in PFM crown by:

1) Metallic bind
2) Mechanical bond
3) Chemical bond
4) Both 2 and 3

📝 Explanation:

Porcelain binds to metal in metal ceramic restorations by mechanical interlocking and chemical bonding. Mechanical interlocking is provided by proper wetting of the metal surface by porcelain.
The adherent metallic oxides, which are formed during the degassing cycle form a good chemical bond with porcelain.
Tin oxide and Indium oxide are formed from precious metal alloys while chromium oxide is formed from base metal alloys.

2
Dental Materials

What is the typical range of Charpy impact strength for a heat-activated denture resin?
1) 0.48 to 0.78 joules
2) 0.98 to 1.27 joules
3) There is no typical range provided
4) The information is not relevant to heat-activated resins

📝 Explanation:

Heat-activated denture resins typically have a Charpy impact strength range of 0.98 to 1.27 joules, which is higher than that of chemically activated resins.

3
Dental Materials

The impression for a diagnostic cast of a partial edentulous mouth should be taken in:

1) Impression wax
2) Modelling compound
3) Hydro-colloid
4) Hydro cal

📝 Explanation:

For making impressions of edentulous ridges, impression plaster and impression compound are considered to be useful. For partial edentulous mouth impressions, hydrocolloids are useful.

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