**Question:** Which of the following phases of dental amalgam has minimum strength?

**Core Concept:** Dental amalgam is a restorative material used in dentistry for filling cavities. It is composed of mercury, silver, tin, copper, and sometimes zinc and/or palladium. The phases of amalgam refer to its physical state and properties.

**Why the Correct Answer is Right:** The correct answer, **D. Solidification**, refers to the initial stage after mixing the amalgam components when they start to solidify and form a stable, coherent structure. During solidification, the amalgam undergoes a process called "dealloying," where the noble alloying elements (silver, tin, copper, and sometimes zinc and/or palladium) dissolve into the liquid mercury, forming a stable alloy that has a higher strength than the individual components.

**Why Each Wrong Option is Incorrect:**

A. **Early solidification:** This phase occurs immediately after mixing the amalgam components, but before the dealloying process has taken place. During this phase, the amalgam has minimum strength due to the unstable alloy composition and incomplete dealloying.

B. **Liquidisation:** Amalgam is initially in a liquid state when mixed, but this option refers to the initial stage after mixing, not the phase with minimum strength.

C. **Hot stage:** This refers to the temperature range during amalgam placement, not a specific phase with minimum strength.

**Clinical Pearl:** The minimum strength of dental amalgam occurs in the **Early solidification** phase before the dealloying process has taken place, making option A the correct answer. Proper handling and correct curing techniques are essential to ensure optimal strength and longevity of the amalgam restoration.