| bur | A rotary cutting instrument, used in dentistry, consisting of a small metal shaft and a head designed in various shapes; used at various rotational velocities for excavating decay, shaping cavity forms, and for reduction of tooth structure. See: burr. (05 Mar 2000) |
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| bur drill | See: bur. (05 Mar 2000) |
| bur fish | <zoology> A spinose, plectognath fish of the Allantic coast of the United States (especially. Chilo mycterus geometricus) having the power of distending its body with water or air, so as to resemble a chestnut bur. Synonym: ball fish, balloon fish, and swellfish. Source: Websters Dictionary (01 Mar 1998) |
| round bur | A dental bur with the cutting blades spherically arranged. (05 Mar 2000) |
| cross-cut bur | A bur with blades located at right angles to its long axis. (05 Mar 2000) |
| inverted cone bur | 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. (05 Mar 2000) |
| end-cutting bur | A bur with blades only on its end. (05 Mar 2000) |
| finishing bur | A bur with numerous fine cutting blades placed close together; used to contour metallic restorations. (05 Mar 2000) |
| fissure bur | A cylindrical or tapered rotary cutting tool intended for extending or widening fissures in a tooth, as for general surface reduction of tooth substance. (05 Mar 2000) |