**Question:** The most frequent cause of fracture of a root tip during extraction of a primary molar is:

A. Obturation of the root canal
B. Inadequate anesthesia
C. Traction force applied at a wrong angle
D. Decay extending into the root canal

**Core Concept:** Root fracture during primary tooth extraction can occur due to various reasons. A root fracture can be classified as either periapical or coronal, depending on the extent of the fracture. Periapical fractures involve the root apex, while coronal fractures involve the coronal portion of the root.

**Why the Correct Answer is Right:** The correct answer is **C. Traction force applied at a wrong angle**. Applying traction force at an inappropriate angle during extraction can result in a coronal fracture of the root tip. This type of fracture occurs when the force applied during extraction is not perpendicular to the long axis of the root, causing the root to flex and fracture at the apex.

**Why Each Wrong Option is Incorrect:**

A. **Obturation of the root canal (Option A)**: Obturation refers to the filling of the root canal, typically done during endodontic treatment (root canal therapy). It is not a cause of fracture during tooth extraction.

B. **Inadequate anesthesia (Option B)**: While inadequate anesthesia can lead to pain and discomfort, it does not directly cause root fractures during extraction. Improper anesthesia can lead to patient movement or resistance during the procedure, but the root fracture is not directly related to this reason.

D. **Decay extending into the root canal (Option D)**: Decay that extends into the root canal can lead to pulpal inflammation or necrosis, but it does not directly cause root fractures during extraction. Correct diagnosis and treatment planning can help prevent complications like root fractures.

**Clinical Pearl:** Always ensure proper patient positioning, anesthesia, and tooth isolation during tooth extraction procedures to minimize the risk of root fractures. Additionally, thorough clinical assessment and accurate diagnosis can help guide appropriate treatment planning, reducing the likelihood of complications like root fractures during extraction.