bur (redirected from excavating bur)

bur (bur) a form of drill used for creating openings in bone or similar hard material.

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bur or burr (bûr)

n.

1. A rotary cutting instrument used in dentistry for excavating decay, shaping cavity forms, and reducing tooth structure.

2. A drilling tool for enlarging a trephine hole in the cranium.

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bur.

See burr.

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bur,

n a rotary cutting instrument of steel or tungsten carbide, supplied with cutting heads of various shapes.

bur, carbide,

n a bur made of tungsten carbide; used at high rotational speeds.

bur, crosscut,

n a bur with blades slotted perpendicularly to the axis of the bur.

bur, end-cutting,

n a bur that has cutting blades only on the end of its head.

bur, excavating,

n a bur used to remove dentin and debris from a cavity.

bur, finishing,

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

n See insert, intramucosal.

bur, inverted cone,

n a bur with a head shaped like a truncated cone, the larger diameter being at the terminal (distal) end.

bur, plug-finishing,

n See bur, finishing.

bur, round,

n a bur with a sphere-shaped head.

bur, straight fissure,

n a bur without crosscuts that has a cylindrical head.

bur, tapered fissure,

n a bur having a long head with sides that converge from the shank to a blunt end.

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bur

a surgical instrument used to ream out the lining of a cavity, for example the lateral ventricle of horses in the operation for roaring, or to debride bone or teeth. A long stem with a round or oval head carrying rasp-like teeth. See also burr.

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finishing bur

for shaping and smoothing composite or amalgam when used for filling teeth.