The temperature (in °F) of the mixing slab for silicate cements should be
**Core Concept**
Silicate cements are a type of dental restorative material that undergoes a chemical reaction to form a hard, durable substance. The temperature of the mixing slab is crucial in controlling the setting reaction of silicate cements. The ideal temperature range for mixing silicate cements is between 64°F and 75°F (18°C and 24°C).
**Why the Correct Answer is Right**
The correct temperature range allows for optimal mixing and setting of the cement. If the temperature is too high, the cement may set too quickly, leading to an under-cured product. Conversely, if the temperature is too low, the cement may not set properly, resulting in a weak or fragile restoration. The ideal temperature range enables the silicate ions to react with the water to form a stable, non-leachable calcium silicate hydrate gel.
**Why Each Wrong Option is Incorrect**
* **Option A:** This temperature is too high and may cause the cement to set too quickly, leading to an under-cured product.
* **Option B:** This temperature is too low and may not allow the silicate ions to react properly with the water, resulting in a weak or fragile restoration.
* **Option C:** This temperature is outside the optimal range and may cause the cement to set unevenly or not at all.
**Clinical Pearl / High-Yield Fact**
To ensure proper mixing and setting of silicate cements, it is essential to maintain the mixing slab at a consistent temperature between 64°F and 75°F (18°C and 24°C). This temperature range allows for optimal control over the setting reaction and ensures a strong, durable restoration.
**Correct Answer:** D. 70°F