Which type of dental cement is typically used for permanent restorations due to its strength?

Zinc phosphate cement is known for its high strength and durability, making it a preferred choice for permanent restorations in dentistry. When mixed properly, zinc phosphate forms a stable and strong bond with various types of dental materials, such as metal and porcelain. Its compressive strength is particularly advantageous in applications that require long-term retention, such as cementing crowns, bridges, and inlays.

It is important to note the characteristics of the other materials listed. Glass ionomer is often used for both permanent and interim restorations due to its adhesive properties and ability to release fluoride, but it does not match the strength of zinc phosphate for permanent applications. Calcium hydroxide is primarily utilized as a pulp capping agent or in temporary fillings because of its ability to promote healing rather than for long-term restorations. Resin composite materials, while strong and aesthetically pleasing, are typically used for direct restorations rather than as a cement for permanent restorations, and they also require different curing processes. Therefore, the strength and stability of zinc phosphate make it the most suitable option for permanent dental restorations.