G.P. is plasticized (softened) by
**Core Concept**
The question is related to the properties of gutta-percha (G.P.), a material commonly used in dentistry for root canal fillings. Gutta-percha is a **thermoplastic** material, meaning its properties can be altered with temperature changes.
**Why the Correct Answer is Right**
Gutta-percha is softened by heat, which is a fundamental property of **thermoplastic** materials. When heated, the material becomes less rigid and more pliable, allowing it to be easily shaped and inserted into the root canal. This property is crucial for achieving a tight seal within the canal.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while some solvents may affect gutta-percha, they are not typically used for softening it in clinical practice.
**Option B:** Incorrect as it does not relate to the common methods of softening gutta-percha.
**Option C:** Incorrect because this option is not a recognized method for softening gutta-percha.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that gutta-percha is softened by heat, which is a critical step in root canal therapy, ensuring a proper fit and seal of the material within the canal.
**Correct Answer:** D. Heat