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August 24, 2015

Dental bur

Dental bur

  A dental bur is a type of burr (cutter) used in a handpiece. The burs are usually made of tungsten carbide or diamond. The three parts to a bur are the head, the neck, and the shank.

  The heads of some burs (such as tungsten carbide burs) contain the blades[citation needed] which remove material. These blades may be positioned at different angles in order to change the property of the bur. More obtuse angles will produce a negative rake angle which increases the strength and longevity of the bur. More acute angles will produce a positive rake angle which has a sharper blade, but which dulls more quickly. The heads of other commonly used burs are covered in a fine grit which has a similar cutting function to blades (e.g. high speed diamond burs).

  There are various shapes of burs that include round, inverted cone, straight fissure, tapered fissure, and pear-shaped burs. Additional cuts across the blades of burs were added to increase cutting efficiency, but their benefit has been minimized with the advent of high-speed handpieces. These extra cuts are called crosscuts.

  Due to the wide array of different burs, numbering systems to categorize burs are used and include a US numbering system and a numbering system used by theInternational Organisation for Standardisation (ISO).

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