Question

You are asked to select a protective base for insulation that is nonirritating under a composite restoration. Which would you select?

A) Dental amalgam
B) Zinc phosphate cement
C) Glass ionomer cement
D) Composite resin

Answer 1

Glass ionomer cement is the best option as a nonirritating protective base under a composite restoration, due to its biocompatibility, sealing ability, and fluoride release.

Step-by-step explanation:

When selecting a protective base for insulation under a composite restoration that is nonirritating, the suitable choice is C) Glass ionomer cement. Dental amalgam (A) is not used as a base due to its composition; it is a silver-containing alloy, which is about 50% mercury by weight and can be toxic. Zinc phosphate cement (B) can be irritating to the pulp and is not typically used for this reason. Composite resin (D) can be used in some cases, but it is not primarily a protective base material. Glass ionomer cement is biocompatible, provides a good seal, releases fluoride, and has adequate insulating properties, which makes it the preferred choice in this situation.

Answer 2

For a protective base under a composite restoration that is nonirritating, the preferred choice is C) Glass ionomer cement.

Step-by-step explanation:

When selecting a protective base for insulation under a composite restoration, it's crucial to choose a material that is nonirritating and compatible with the surrounding dental tissues. Glass ionomer cement (Option C) is a suitable choice for this purpose. It is known for its biocompatibility, low irritation potential, and the ability to release fluoride, promoting tooth remineralization. On the other hand, options A (Dental amalgam), B (Zinc phosphate cement), and D (Composite resin) may have drawbacks in terms of biocompatibility or thermal conductivity, making them less ideal as protective bases in this context. Dental practitioners often consider the compatibility and long-term effects of materials when selecting them for specific dental procedures.

Option C is the answer.