**Question:** Preparation of shoulder in anterior tooth is done with:

A. Round bur
B. Flat bur
C. Chamfer bur
D. Torneuse bur

**Correct Answer:** C. Chamfer bur

**Core Concept:**
The preparation of a dental restoration, particularly in anterior teeth, involves meticulous shaping of the tooth structure to achieve optimal esthetics, retention, and stability of the restoration. Different dental burs are used for specific aspects of the preparation.

**Why the Correct Answer is Right:**
A chamfer bur (Option C) is used to remove the tooth structure to create a shoulder, which is the rounded, slightly elevated area at the base of the preparation. This shoulder helps to distribute the restoration's forces evenly, reducing the risk of fracture and ensuring proper esthetics. A chamfer bur allows for precise control of the shoulder depth and width, ensuring stability of the restoration.

**Why Each Wrong Option is Incorrect:**

A. Round bur (Option A) is used for smoothing the tooth surface but lacks the precision to create a proper shoulder.
B. Flat bur (Option B) creates a flat shoulder, which may compromise the retention and stability of the restoration.
D. Torneuse bur (Option D) is a general purpose bur used for both cutting and shaping, but it is not specifically designed for creating a shoulder in anterior teeth preparations.

**Why the Correct Answer is Right:**

**Clinical Pearl:** In dental restorative procedures, the chamfer preparation technique is used for anterior teeth to create a shoulder that aids in esthetics, retention, and stability of the restoration. Using an appropriate bur is crucial for successful and long-lasting dental restorations.