On a carbide bur, a great number of cutting blades results in:
**Core Concept**
A carbide bur is a type of dental handpiece used for cutting and shaping tooth structure. The cutting action is achieved through the rotation of a cutting blade, which is typically made of tungsten carbide. The number of cutting blades on a carbide bur affects its cutting efficiency and precision.
**Why the Correct Answer is Right**
A greater number of cutting blades on a carbide bur results in a **finer cutting action**. This is because each blade contributes to the cutting process, allowing for a more precise and delicate removal of tooth structure. The increased number of blades also enables the bur to cut through harder materials with less pressure, reducing the risk of damaging surrounding tooth structure.
**Why Each Wrong Option is Incorrect**
**Option A:** A greater number of cutting blades would actually result in a coarser cutting action, not a finer one.
**Option B:** The number of cutting blades on a carbide bur does not affect its rotational speed.
**Option C:** A greater number of cutting blades would not increase the bur's durability; it would actually increase the risk of blade breakage due to increased stress on individual blades.
**Clinical Pearl / High-Yield Fact**
When selecting a carbide bur, it's essential to choose the correct number of cutting blades based on the specific dental procedure and the patient's tooth structure. A finer cutting action is typically required for more intricate procedures, such as cavity preparation or shaping of dental restorations.
**Correct Answer:** C.