Conservative Dentistry NEET MDS Practice Test

1

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.

2

Conservative Dentistry

The advantage of natural glaze compared to applied artificial glaze
1) More smooth finish is achieved
2) More permanent glaze is achieved
3) More shiny surface is achieved
4) All of the above

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

Natural glaze is often more durable and permanent compared to applied artificial glaze, providing a better finish.

3

Conservative Dentistry

Which factor most affects the adaptation of the gold foil to the cavity walls
1) Size of the condenser
2) Direction of the force
3) Shape of the condenser
4) Force applied

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

The direction of the force is the most critical factor for the adaptation of gold foil to cavity walls because the force must be directed at a \(45^{\circ }\) angle to the cavity wall to ensure proper condensation and a tight seal.

�This angle is necessary to compact the gold foil against the axial or pulpal wall, preventing the formation of voids and ensuring maximum density and adaptation to the cavity margins.

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