**Question:** Commonest complication after removal of mandibular 3rd molar

**Core Concept:** Mandibular third molar extraction is a common dental procedure that can lead to various complications. The most common complication is localized problems, such as swelling, pain, and infection.

**Why the Correct Answer is Right:**

The correct answer is D, **Postoperative dry socket (Alveolitis)**. Postoperative dry socket is a complication that occurs when the blood clot gets dislodged or fails to form in the extraction socket after tooth extraction. This can lead to significant pain, bleeding, and delayed healing. Dry socket is caused by factors that disrupt the blood clot formation or stability, such as smoking, improper oral hygiene, and excessive mouth rinsing after the extraction.

**Why Each Wrong Option is Incorrect:**

A. **Infection (Oral Cellulitis)**: This is not the most common complication related to mandibular third molar extraction. Postoperative dry socket is more common due to its relationship with blood clot formation and stability.

B. **Tooth fracture (Fractura)**: This option is incorrect because tooth fractures are unrelated to the complications related to tooth extraction. Tooth fractures are more likely to occur due to trauma or poor tooth structure, not due to the extraction procedure itself.

C. **Tooth movement (Movimento)**: This option is incorrect because tooth movement is unrelated to the complications related to tooth extraction. Tooth movement occurs spontaneously or due to other factors but not directly because of the extraction procedure.

**Clinical Pearl:**

Postoperative dry socket is a significant concern after mandibular third molar extraction due to its impact on pain and healing. Proper patient education on maintaining oral hygiene, avoiding smoking, and minimal mouth rinsing can help prevent dry socket and improve the overall recovery process.

**Correct Answer:** D. Postoperative dry socket (Alveolitis)