What type of bur is used for preparing a shoulder margin?

The shoulder margin in dental restorations is characterized by its flat surface that allows for a clear and defined transition between the tooth structure and the restorative material. A flat-ended diamond bur is specifically designed to create flat surfaces and shoulder preparations effectively. Its structure allows for precision in achieving the necessary contour and depth of the margin, which is essential for the fit and retention of crowns, inlays, or onlays.

This type of bur also provides a smooth finish to the prepared surface, reducing the risk of microleakage and ensuring better adhesion of the restorative material. The flat design allows the practitioner to maintain control over the cutting process, which is vital for achieving the ideal margin required in prosthetic dentistry. Other bur types may not provide the flat surface required for a proper shoulder margin, which can affect the quality of the dental work.