| periodontal file | An instrument with a series of ridges or points arranged in rows on its surface, used for scaling or removing dental calculus from the teeth. (05 Mar 2000) |
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| root canal file | A pointed, flexible, steel intracanal instrument used in rasping canal walls. (05 Mar 2000) |
| Hedstrom file | A coarse root canal file similar to a rasp. (05 Mar 2000) |
| file | 1. A steel instrument, having cutting ridges or teeth, made by indentation with a chisel, used for abrading or smoothing other substances, as metals, wood, etc. A file differs from a rasp in having the furrows made by straight cuts of a chisel, either single or crossed, while the rasp has coarse, single teeth, raised by the pyramidal end of a triangular punch. 2. Anything employed to smooth, polish, or rasp, literally or figuratively. "Mock the nice touches of the critic's file." (Akenside) 3. A shrewd or artful person. "Will is an old file spite of his smooth face." (Thackeray) Bastard file, Cross file, etc. See Bastard, Cross, etc. Cross-cut file, a file having two sets of teeth crossing obliquely. File blank, a steel blank shaped and ground ready for cutting to form a file. File cutter, a maker of files. Second-cut file, a file having teeth of a grade next finer than bastard. Single-cut file, a file having only one set of parallel teeth; a float. Smooth file, a file having teeth so fine as to make an almost smooth surface. Origin: AS. Feol; akin to D. Viji, OHG. Fila, fihala, G. Feile, Sw. Fil, Dan. Fiil, cf. Icel. L, Russ. Pila, and Skr. Pi to cut out, adorn; perh. Akin to E. Paint. To make ful; to defile. "All his hairy breast with blood was filed.Spenser." "For Banquo's issue have I filed mind.Shak." Origin: OE. Fulen, filen, foulen, AS. Flan, fr. Fl foul. See Foul, and cf. Defile, v.t. Source: Websters Dictionary (01 Mar 1998) |
| bone within a bone | <radiology> STOP heavy metal, S: sickle cell disease, T: Thorotrast, O: osteopetrosis, P: Paget's disease, heavy metals, hypervitaminosis D (12 Dec 1998) |
| acute reflex bone atrophy | Atrophy of bones, commonly of the carpal or tarsal bones, following a slight injury such as a sprain. See: causalgia, reflex sympathetic dystrophy. Synonym: acute reflex bone atrophy, posttraumatic osteoporosis, Sudeck's syndrome. Origin: L. English sweat (05 Mar 2000) |
| air-bone gap | The difference between the threshold for hearing acuity by bone conduction and by air conduction. (05 Mar 2000) |
| Albrecht's bone | A small bone between the basioccipital and basisphenoid. (05 Mar 2000) |
| allogeneic bone marrow transplant | <haematology, procedure> A bone marrow transplant using marrow collected from a matched healthy donor, usually a brother or sister. The risks associated with the transplant increase with age and 50 years of age is generally regarded as the upper limit. (13 Nov 1997) |
| alveolar bone | That portion of bone in either the maxilla or the mandible which surrounds and supports the teeth. (12 Dec 1998) |
| alveolar bone loss | The resorption of bone in the supporting structures of the maxilla or mandible as a result of periodontal disease. (12 Dec 1998) |
| alveolar supporting bone | alveolar process |
| amyloidosis: bone manifestations | <radiology> Joint pain without radiographic findings, osteoporosis, especially in axial skeleton, lytic lesions that destroy cortex and invade soft tissue, wrist, scaphoid and lunate lesions that may extend into the carpal tunnel, inducing the classic complaints of carpal tunnel syndrome amyloid arthropathy Differential diagnosis: pigmented villonodular synovitis, synovial chondromatosis, rheumatoid arthritis, TB (12 Dec 1998) |
| aneurysmal bone cyst | <radiology> ABC, 10 - 30 yrs, 75% before skeletal maturity, sites: long bones; also, flat bones Findings: metaphyseal if unfused, metaepiphyseal after fusion, lytic, expansile, thin, continuous rim, thin internal bony strands (12 Dec 1998) |
| ankle bone | 1. <anatomy> The astragalus. 2. <surgery> A variety of clubfoot (Talipes calcaneus). See the Note under Talipes. 1. A slope; the inclination of the face of a work. 2. <geology> A sloping heap of fragments of rock lying at the foot of a precipice. Origin: L, the ankle, the ankle bone. (26 Nov 1998) |