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NEET MDS Quiz - Practice Test
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Conservative Dentistry - 3 Questions

1
Conservative Dentistry
The best method to retract gingiva for class V composite restoration
1. Retraction ford
2. Electrosurgery
3. Rubber dam
4. All of the above

📝 Explanation:

For class V composite restoration, the best method to retract gingiva is by using a rubber dam. This provides isolation, visualization, and moisture control, which are crucial for successful adhesive techniques. While other methods like retraction cords or electrosurgery may be used in some cases, they are not the most suitable for routine class V restorations.

2
Conservative Dentistry
The main purpose of etching the enamel before placing composites
1) Increases the surface area 2000 times
2) To create surface irregularities to aid in mechanical interblocking
3) Allow proper adaptation and decrease marginal leakage
4) All of the above

📝 Explanation:

The main purposes of etching enamel before placing composites are to:
Increase the surface area for bonding.
Create surface irregularities to aid in mechanical interlocking.
Allow proper adaptation and decrease marginal leakage.

3
Conservative Dentistry
Bonding in porcelian fused to metal restorations is
1) Chemical and mechanical
2) Metallic and adhesive
3) Only chemical bonding
4) Only mechanical bonding

📝 Explanation:

The bonding in porcelain fused to metal (PFM) restorations is achieved through a combination of both chemical and mechanical mechanisms.


The chemical bond forms due to oxide interactions between the metal and the porcelain, while the mechanical bond is created by the porcelain flowing into microscopic irregularities on the surface of the metal.

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