DANB General Chairside Practice Test

Which rotary instrument is known for cutting the fastest and most efficiently?

1. Steel bur

2. Carbide bur

3. Diamond stone

4. Round bur

The correct answer is: Diamond stone

The diamond stone is recognized for its exceptional cutting efficiency and speed in dental procedures. The unique composition of diamond particles provides a sharp, aggressive cutting action, making it ideal for procedures that require precision and quick results. These instruments are often used for enamel reduction, crown preparations, or other tasks where a high-speed cutting action is necessary. The other options, while useful in specific contexts, do not match the overall cutting efficiency of a diamond stone. Steel burs, for example, are beneficial for cutting but do not offer the same level of speed and are generally used for finer finishing. Carbide burs are designed to cut harder materials like enamel and dentin efficiently, yet they still fall short of the speed offered by diamond stones. Round burs, though versatile for cavity preparation, lack the aggressive cutting power of diamond stones, making them less efficient for tasks that require rapid material removal. In summary, the diamond stone's superior material and design contribute to its reputation as the most effective rotary instrument for fast cutting.