Which type of bur is typically used to prepare a chamfer margin?

The most suitable type of bur for preparing a chamfer margin is a round ended diamond bur. This design allows for the smooth creation of a rounded cervical finish line, which is essential in achieving the ideal contour for crown preparations. A chamfer margin requires a gentle, flowing transition without sharp angles, and the round end of the bur facilitates this by allowing controlled movement and adaptation to the tooth's natural anatomy.

Using a round ended diamond bur also enhances the precision of the margin, which is crucial for both the fit of the prosthesis and the health of the surrounding periodontal tissues. The diamond material aids in effective cutting and shaping of enamel and dentin, providing a clean and polished margin that improves the overall fit and aesthetics of the final restoration.

Other bur types are generally not suited for this specific task, as they do not provide the necessary shape or control needed for chamfer preparations.