**Question:** Purpose of cavity preparation is

A. To remove infected dentin and enamel
B. To facilitate bonding of dental materials
C. To increase tooth strength
D. To provide a space for restoration placement

**Core Concept:** Cavity preparation is a crucial step in dental treatment, specifically in preparing an area for restorative materials like amalgam, composite resin, or glass ionomer cement. It involves removing infected tissues, shaping the prepared area, and ensuring optimal conditions for the bonding of the restoration.

**Why the Correct Answer is Right:** The correct answer, B, explains the main purpose of cavity preparation: to facilitate bonding of dental materials. This ensures a strong, durable restoration that is well-adhered to the tooth structure, reducing the risk of secondary caries, leakage, and other complications.

**Why Each Wrong Option is Incorrect:**

A. Removing infected dentin and enamel is an essential part of cavity preparation, but it is not the primary purpose. Removing infected tissues helps prevent dental caries and maintain tooth health.

C. Increasing tooth strength is a secondary effect of cavity preparation, as the restoration will provide the majority of the tooth's strength.

D. Providing a space for restoration placement is a result of preparing the cavity, not the primary purpose. The goal is to prepare the area with proper shape, depth, and dimensions to accommodate the restoration and ensure optimal bonding.

**Practical Clinical Application (Clinical Pearl):** The correct understanding of cavity preparation's purpose is crucial for selecting the appropriate restoration material, achieving optimal bond strength, and preventing complications like secondary caries and leakage. Always ensure you understand the primary purpose and secondary effects of cavity preparation to provide the best patient care.