The first instrument to extirpate pulp is
**Core Concept**
Pulp extirpation is a crucial step in endodontic therapy, involving the removal of infected or damaged dental pulp from the root canal. This procedure is essential for preventing reinfection and promoting the healing of the surrounding tissues.
**Why the Correct Answer is Right**
The first instrument to extirpate pulp is typically the **endodontic explorer** or **pulp elevator**. This instrument is used to loosen and remove the infected pulp tissue from the root canal. The explorer has a sharp, curved point that allows for gentle yet effective removal of the pulp, minimizing damage to the surrounding dentin and canal walls. As the pulp is loosened, the explorer helps to separate it from the canal walls, facilitating its removal.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the **endodontic file** is used for shaping and cleaning the root canal, not for removing pulp tissue.
* **Option B:** This option is incorrect because the **periodontal probe** is used for measuring periodontal pocket depths and assessing periodontal health, not for pulp extirpation.
* **Option C:** This option is incorrect because the **dental drill** is used for removing tooth structure, such as caries or old restorations, but is not the first instrument used for pulp extirpation.
**Clinical Pearl / High-Yield Fact**
When using an endodontic explorer for pulp extirpation, it's essential to use gentle, rocking motions to avoid damaging the canal walls or pushing the pulp further into the canal.
**Correct Answer:** A. Endodontic explorer