When deep gingival extension of proximal box is anticipated, which of the following is used?
**Core Concept**
The question is testing the understanding of the principles of dental restorative procedures, specifically the selection of a suitable dental material for a deep gingival extension of a proximal box. A proximal box is a part of a dental restoration, such as a crown or a filling, that extends into the interproximal space between two teeth.
**Why the Correct Answer is Right**
A deep gingival extension of a proximal box requires a material that can withstand the forces of mastication and maintain its shape without causing irritation to the surrounding gingiva. **Glass Ionomer Cement** (GIC) is a suitable choice in this scenario because it is a biocompatible, fluoride-releasing material that can be used in direct contact with the gingiva. GIC also has a low modulus of elasticity, which allows it to be carved and shaped easily to fit the contours of the proximal box.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so we will move on to the next one.
* **Option B:** **Composite Resin** is not the best choice for a deep gingival extension of a proximal box because it can be more difficult to carve and shape than GIC, and it may not be as biocompatible in direct contact with the gingiva.
* **Option C:** **Amalgam** is not typically used for a deep gingival extension of a proximal box because it is a more rigid material that can cause irritation to the surrounding gingiva.
**Clinical Pearl / High-Yield Fact**
When selecting a material for a deep gingival extension of a proximal box, consider the biocompatibility and fluoride-releasing properties of the material. Glass Ionomer Cement is a good choice because it meets these criteria and can be used in direct contact with the gingiva.
**Correct Answer:** C. Amalgam