bur

1. A rotary cutting instrument. 2. In ophthalmology, a device used to remove rust rings embedded in the cornea. SYN: burr.

- cross-cut b. a b. with blades located at right angles to its long axis.

- end- cutting b. a b. with blades only on its end.

- finishing b. a b. with numerous fine cutting blades placed close together; used to contour metallic restorations.

- fissure b. a cylindrical or tapered rotary cutting tool intended for extending or widening fissures in a tooth, as for general surface reduction of tooth substance.

- inverted cone b. a rotary cutting instrument in the shape of a truncated cone with the smaller end attached to the shaft; generally used for entering carious pits or creating undercuts in cavity preparations.

- round b. a dental b. with the cutting blades spherically arranged.

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bilateral ureteral occlusion

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bur 'bər n

1) usu burr a small surgical cutting tool (as for making an opening in bone)

2) a bit used on a dental drill

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n.

1. a cutting drill that fits in a dentist's handpiece. It may be made from hardened steel, stainless steel, or tungsten carbide or be coated with diamond particles. Burs are mainly used for cutting cavities in teeth, removing old restorations, and preparing teeth to receive artificial crowns.

2. (burr) a surgical drill for cutting through bone.

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(bur) 1. a metal rotary dental instrument with cutting heads of various shapes, held and revolved in a handpiece; used to remove carious material from within decayed teeth, reduce decayed or fractured hard tissues, form the design of the cavity preparation, and finish and polish the teeth and restorations. Called also drill. 2. a type of surgical drill for making holes in bones. In both senses, also spelled burr.

Diamond burs.