**Question:** Most common cause of oroantral fistula

A. Tooth extraction
B. Nasal trauma
C. Nasal surgery
D. Nasal malignancy

**Core Concept:** Oroantral fistula is a communication between the oral cavity and the maxillary sinus. It can occur following tooth extraction or other maxillofacial surgeries.

**Why the Correct Answer is Right:** The most common cause of oroantral fistula is tooth extraction (Option A). This occurs due to the proximity of the maxillary sinus to the maxillary alveolar ridge where teeth are located. During tooth extraction, if the dental practitioner does not properly isolate the sinus mucosa and follows proper surgical techniques, the sinus membrane can be inadvertently perforated, leading to the formation of an oroantral fistula.

**Why Each Wrong Option is Incorrect:**

- Nasal trauma (Option B) is less common than tooth extraction as it involves external injury to the maxillary sinus mucosa, rather than a surgical procedure.
- Nasal surgery (Option C) is also less common than tooth extraction but refers to a broader category of maxillofacial surgeries, which may involve the sinus membrane and lead to oroantral fistula.
- Nasal malignancy (Option D) is an extremely rare cause of oroantral fistula. Nasal malignancies generally present with more significant symptoms and complications, and their management is typically different from that of simple oroantral fistulas resulting from tooth extraction.

**Clinical Pearl:** Proper surgical techniques, especially in dental extractions, are essential to minimize the risk of oroantral fistula formation. This includes appropriate local anesthesia, proper oral and nasal mucosal protection, and meticulous surgical technique to avoid inadvertent sinus mucosa perforation.

**Correct Answer:** Oroantral fistula is most commonly caused by tooth extraction (Option A), which highlights the importance of careful surgical technique and proper mucosal protection during dental procedures to prevent this complication.