In which scenario would you use Zinc phosphate Type 2?

Zinc phosphate Type 2 is specifically formulated to be used for cementing indirect restorations such as crowns or bridges due to its strong adhesive properties and durability. This type of zinc phosphate cement provides a firm bond and is designed to withstand the stresses associated with occlusal forces, making it an ideal choice for permanent restoration applications.

In contrast, the other scenarios listed do not align with the intended use of Zinc phosphate Type 2. For example, temporary cementation of orthodontic bands generally requires a material that is easily removable, which is not the characteristic of a permanent cement like Type 2. Applying a liner under a restoration is typically done with other materials that offer better compatibility and protection for the pulp, such as calcium hydroxide or glass ionomer. Finally, using Zinc phosphate Type 2 as a base for cavity preparations is not advisable since other materials designed for thermal insulation and protection of the pulp, like glass ionomer or resin-modified glass ionomers, are preferred for that purpose. Thus, the correct application of Zinc phosphate Type 2 is specifically suited for cementing indirect restorations.