Burs Used in Dentistry
Dentists and dental laboratory technicians use a variety of rotary instrument burs in both the dental office and the dental laboratory. The burs are manufactured to fit various handpieces and may be made from steel or carbide, or they may have diamond-coated tips. Burs come in many shapes, each of which is used for a different purpose. While dental burs are used to work on human teeth or bone, laboratory burs are used to work on acrylic materials, such as dentures and partials, or plaster, metal, or stone materials.
Abrasives also have a place in the dental office or dental laboratory. They may be mounted or unmounted and are made from silicon carbide, high-grade corundum or diamond grit. Abrasive discs are used to polish and smooth material, are flexible or rigid, and may be grit-coated on one or both sides. Diamond grit may be used as a coating or it may be embedded into the bur or disc. These are known as sintered diamond instruments.
Bur Applications in Dental Practices and Dental Laboratories
The following chart describes some of the various dental bur applications.
remove carious tooth structure
open tooth for endodontics
open/extend cavity prep
remove dental decay
make retention prep undercuts
|Preparation Bur||fissure-plain or crosscut cylinder||
form cavity walls
place retention grooves in walls
|fissure - tapered||
angle wall cavity preparation
|wheel||form retention in preps|
|cylinder - end cutting||crown shoulder preparation|
|diamond - many shapes||crown prep tooth reduction|
|Surgical Bur||many shapes||cut tooth or bone structure|
|Finishing Bur||many shapes||smooth, trim, and finish restorations|
|Laboratory (Vulcanite) Bur||cutters - many shapes||cut acrylic, plaster, metal|
|Abrasives||mounted stones - many shapes||polishing and smoothing|
|disc shape||grinding and cutting|
|Polishers||silicone - mounted or unmounted||polishing|