| Abr, Abras | abrasion |
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| abrasion | 1. <pathology> The wearing away of a substance or structure (such as the skin or the teeth) through some unusual or abnormal mechanical process. 2. <clinical sign> A superficial injury to the skin or other body tissue caused by rubbing or scraping resulting in an area of body surface denuded of skin or mucous membrane. (11 Nov 1997) |
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| gingival abrasion | A lesion of the gingiva resulting from mechanical removal of a portion of the surface epithelium. (05 Mar 2000) |
| mechanical abrasion | <procedure, surgery> A surgical procedure which involves the controlled abrasion of the upper layers of the skin to smoothen the skin and remove wrinkles, small scars or foreign bodies (tattoos). (27 Sep 1997) |
| tooth abrasion | The pathologic wearing away of the tooth substance by brushing, bruxism, clenching, and other mechanical causes. It is differentiated from tooth attrition in that this type of wearing away is the result of tooth-to-tooth contact, as in mastication, occurring only on the occlusal, incisal, and proximal surfaces. It differs also from tooth erosion, the progressive loss of the hard substance of a tooth by chemical processes not involving bacterial action. (12 Dec 1998) |
| C sliding osteotomy | An extraoral osteotomy in the shape of a "C" performed bilaterally in the mandibular rami for the correction of retrognathia and/or apertognathia. (05 Mar 2000) |
| sliding | 1. That slides or slips; gliding; moving smoothly. 2. Slippery; elusory. "That sliding science hath me made so bare." (Chaucer) Sliding friction, the timber guides used in launching a vessel. Source: Websters Dictionary (01 Mar 1998) |
| sliding filament hypothesis | The theory that the contracting muscle shortens because two sets of filaments slide past each other. (05 Mar 2000) |
| sliding filament model | <cell biology> Generally accepted model for the way in which contraction occurs in the sarcomere of striated muscle, by the sliding of the thick filaments relative to the thin filaments. (18 Nov 1997) |
| sliding flap | A rectangular flap raised in an elastic area, with its free end adjacent to a defect; the defect is covered by stretching the flap longitudinally until the end comes over it. Synonym: advancement flap, French flap. (05 Mar 2000) |
| sliding hernia | A hernia in which an abdominal viscus forms part of the sac. Synonym: extrasaccular hernia, parasaccular hernia, slipped hernia. (05 Mar 2000) |
| sliding hiatal hernia | <radiology> Axial hernia, concentric hernia, 99% of hiatal hernias, portion of peritoneal sac forms part of wall of hernia, aetiology: rupture of phrenicoesophageal membrane due to repetitive stretching with swallowing, incidence: increases with age Findings: UGI, epiphrenic bulge, distance between B ring and hiatal margin greater than 2cm, tortuous oesophagus, gastroesophageal reflux, greater than 6 thick gastric folds within suprahiatal pouch, CT, dehiscence of diaphragmtic crura greater than 15 mm, pseudomass within/above distal oesophagus, fat (omemtum) surrounding distal oesophagus (12 Dec 1998) |
| sliding hook | A movable attachment used on an orthodontic wire for the application of elastic traction or headgear force. (05 Mar 2000) |
| sliding oblique osteotomy | An oral surgical procedure in which the mandibular ramus is cut vertically from the sigmoid notch to the angle to facilitate posterior repositioning of the mandible in correction of mandibular prognathism; it may be performed extraorally or intraorally, and is similar to vertical osteotomy. (05 Mar 2000) |
| sliding oesophageal hiatal hernia | Displacement of the cardioesophageal junction and the stomach through the oesophageal hiatus. (05 Mar 2000) |
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