Metal cutting burs (tungsten carbide) Particularly appropriate tor crown & bridge cutting as well as(or amalgam or composite removal. The best-seller in its category: the Transmetal bur Specially designed to cut and perforate crowns & bridges (gold and Ni-Cr or other non precious alloys). Hclicoid tooth pattern with extra fine cross-cutting: Good debris evacuation (no bur clogging and therefore no overheating of the bur).