Which bur size is typically referred to as the pear shaped bur?

The pear shaped bur is commonly recognized as the 330 bur. This particular shape is designed for cutting and modifying tooth structure, particularly in preparing cavities. The unique pear shape allows clinicians to create an elliptical preparation, enabling better access and retention of restorations. The 330 bur is efficient for both initial cavity preparation and refinement, making it a versatile tool in restorative dentistry.

Other options like the 245, 556, and 1157, though they may also have their own specific uses in dental procedures, do not share the specific pear shape characteristic that is associated with the 330 bur. Understanding the unique shapes and their applications helps in selecting the right bur for various dental tasks, ultimately leading to more effective and precise outcomes in treatments.