Conservative Dentistry NEET MDS Practice Test

1

Conservative Dentistry

The final polish of a cat gold alloy to achieve a smooth polished surface is done by
1) Pickling
2) Electropolishing
3) Sandblasting
4) Rouge

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

The final polish of a cast gold alloy to achieve a smooth polished surface is done by

1) Pickling: This is a process used to remove oxides and impurities from the surface of a metal before applying a final finish. However, it does not provide the final polish.
2) Electropolishing: This technique uses an electrical current to dissolve the metal surface and create a smooth finish, but it is not commonly used for gold alloy restorations.
3) Sandblasting: This method involves propelling an abrasive material against the metal surface to smooth and clean it, but it is too aggressive for the final polish of a gold alloy restoration.
4) Rouge: Rouge is a fine abrasive paste used with a polishing wheel or point to achieve the final polish on a cast gold alloy restoration. It removes minor imperfections and gives a high luster to the metal.

The correct answer is 4) Rouge, as it is the standard technique for achieving a smooth, polished surface on cast gold alloys.

2

Conservative Dentistry

Which minimum percentage of chromium must be added to steel to provide the corrosion resistance characteristic of stainless steel?

1) 5%

2) 2%

3) 25%

4) 12%

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

12% Chromium is selected as the baseline required threshold to achieve optimal general corrosion resistance. The chromium reacts with oxygen in the atmosphere to form a microscopic, self-healing, and passive chromium-oxide surface layer that prevents rust and staining.

3

Conservative Dentistry

Aluminium oxide polishing powder is obtained from
1) Aluminium
2) Cryolite
3) Bauxite
4) Vulcanite

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

�Aluminium oxide (Al₂O₃) is primarily derived from bauxite, which is an ore that contains a high percentage of aluminium. The Bayer process is commonly used to extract aluminium oxide from bauxite.

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