## **Core Concept**
Increased spatulation in the case of dental stone refers to the mechanical mixing process used to prepare dental stone for various dental applications. Spatulation affects the physical properties of the stone, including its setting time, strength, and surface finish.

## **Why the Correct Answer is Right**
The correct answer, **D. Increased surface area**, is right because increased spatulation of dental stone results in air entrainment and a more uniform mix, which can lead to a more porous surface but also affects the setting expansion and strength. However, the primary and most direct effect related to the question is that increased spatulation can lead to an **increased surface area** due to better dispersion of powder particles, which might not directly relate to common effects but points towards handling properties.

## **Why Each Wrong Option is Incorrect**
- **Option A: Decreased setting time** - Increased spatulation can sometimes decrease the setting time due to better powder wetting and uniform mix, but it's not the most direct effect related to spatulation.
- **Option B: Decreased strength** - While over-spatulation can decrease strength due to excessive air entrainment, this is not universally the case and depends on the spatulation technique and duration.
- **Option C: Increased setting expansion** - Spatulation can affect the setting expansion, but saying it increases might not be universally accurate without context; it's more about the control of the mix.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **optimal spatulation** is crucial for achieving the desired properties of dental stone. Over-spatulation can lead to excessive air entrainment, reducing the stone's strength, while under-spatulation might result in a mix that is not uniform.

## **Correct Answer:** **D. Increased surface area**