Which of the following is true regarding irreversible hydrocolloid impression material?

Irreversible hydrocolloid impression material is designed for single-use and cannot be poured multiple times, which is a critical characteristic. Once set, it undergoes a chemical change that makes it rigid and prevents it from being returned to its original gel state. This means that after taking an impression, the material cannot be remade or rehydrated for another use.

This type of material is commonly used for preliminary impressions due to its ease of handling and ability to capture fine details. However, it is also important to note that while hydrocolloid materials are flexible when they are in their unset, gel-like state, they do not retain that flexibility once they have set. Instead, they become firm and dimensionally stable, which is essential for capturing accurate impressions for dental procedures.

While it provides a reasonable level of accuracy for certain applications in dentistry, it is not the most accurate material available compared to other impression materials specifically designed for high-precision applications. Thus, this emphasis on single-use and inability to be poured multiple times aligns with the correct answer regarding the characteristics of irreversible hydrocolloid impression material.