Which of the following is true regarding zinc phosphate cement?

Zinc phosphate cement is known for its use in dental applications, particularly for luting crowns and inlays due to its strong adhesive properties. Mixing zinc phosphate cement on a cool glass slab is important because the exothermic reaction that occurs when the powder is mixed with liquid can cause the mixture to set too quickly and become less workable if the temperature increases. A cool glass slab helps to control this temperature rise, allowing for a longer working time and a more uniform mix.

Choosing a surface that is cool also prevents premature setting of the cement, which can result in poor bonding and inadequate strength of the final restoration. This is particularly crucial when precise application and timing are necessary to achieve the desired consistency and handling characteristics of the cement. Given this context, and understanding the importance of temperature control in the mixing process, using a cool glass slab is indeed the correct approach when working with zinc phosphate cement.

Other surfaces, including high-speed mixers or surfaces that do not help maintain an optimal temperature, could negatively impact the properties of the cement. Additionally, while zinc phosphate is mixed with a specific liquid, it is not exclusively mixed with water; it requires a phosphoric acid solution intended for dental applications to achieve the necessary consistency and properties for effective use.