Which of the following bases are contra indicated under a composite resin restoration:
**Core Concept**
The question is testing the knowledge of the properties and uses of different dental bases in composite resin restorations. Dental bases are materials used to prepare the tooth surface before placing a composite resin restoration. They help create a strong bond between the tooth and the restoration, and also protect the pulp.
**Why the Correct Answer is Right**
The correct answer is likely a substance that is not compatible with the composite resin or can interfere with its bonding properties. Dental bases should be carefully selected based on their chemical compatibility with the composite resin and their ability to promote a strong bond between the tooth and the restoration.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely a dental base that is commonly used in composite resin restorations, such as a self-etching primer or a bonding agent. It is not contraindicated.
* **Option B:** This option may be a substance that is not typically used as a dental base, such as a fluoride varnish. It may not be compatible with the composite resin or may interfere with its bonding properties.
* **Option C:** This option may be a substance that is not suitable for use as a dental base, such as a calcium hydroxide liner. It may not provide a strong bond between the tooth and the restoration.
**Clinical Pearl / High-Yield Fact**
When selecting a dental base for a composite resin restoration, it is essential to choose a material that is chemically compatible with the composite resin and promotes a strong bond between the tooth and the restoration. This can help ensure the long-term success of the restoration and prevent complications such as microleakage or secondary caries.
**Correct Answer:** B.