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To achieve optimal surface speed and cutting conditions, burrs are rapidly rotated at high speeds, often in the range of thousands or tens of thousands of RPM, which is typically the maximum speed supported by a given spindle. The cutters depicted in the image, being made of tungsten carbide, can withstand and operate at these elevated speeds.
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through sintering [7] for use in industrial machinery, engineering facilities, [8] molding blocks, [9] cutting tools, chisels, abrasives, armor ...
A dental burr, or bur, is a type of cutter used in a handpiece. The burrs are usually made of tungsten carbide or diamond. The three parts of a burr are the head, the neck, and the shank. [4] The heads of some burrs (such as tungsten carbide burrs) contain the blades which remove material.
The most common hard material is tungsten carbide (solid or tipped), but reamers with edges of cubic boron nitride (CBN) or diamond also exist. [ 6 ] The main difference between both categories is that hard materials are usually unaffected by the heat produced by the machining process and may actually benefit from it.
The cutting surfaces of dental burs are made of a multi-fluted tungsten carbide, a diamond-coated tip, or a stainless steel multi-fluted rosehead. There are many types and classifications of burs. Some of the most common are the round bur (sizes ¼ to 10) or inverted cone (sizes 33½ to 90L). Burs are also classified by:
Mentions of "carbide" or "tungsten carbide" in industrial contexts usually refer to these cemented composites. Most of the time, carbide cutters will leave a better surface finish on a part and allow for faster machining than high-speed steel or other tool steels. Carbide tools can withstand higher temperatures at the cutter-workpiece interface ...