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fixation (fik-sa´shun)

1. The condition of being firmly attached or set. 2. In histology, the rapid killing of tissue elements and their preservation and hardening to retain as nearly as possible the same relations they had in the living body.fixing; 3. In chemistry, the conversion of a gas into solid or liquid form by chemical reactions, with or without the help of living tissue. 4. In psychoanalysis, the quality of being firmly attached to a particular person or object or period in one's development. 5. In physiological optics, the coordinated positioning and accommodation of both eyes that results in bringing or maintaining a sharp image of a stationary or moving object on the fovea of each eye. [L. figo, pp. fixus, to fix, fasten]
ammonia f. ammonia assimilation
bifoveal f. binocular f
binocular f. a condition in which both eyes are simultaneously directed to the same target.bifoveal f;
circumalveolar f. stabilization of a fracture segment or surgical splint by wire passed through and around the dental alveolar process.
circummandibular f. stabilization of a fracture segment or surgical splint by wire passed around the mandible.
circumzygomatic f. stabilization of a fracture segment or surgical splint by wire passed around the zygomatic arch.
complement f. f. of complement in a serum by an antigen-antibody combination whereby it is rendered unavailable to complete a reaction in a second antigen-antibody combination for which complement is necessary; the second system usually serves as an indicator (red blood cells plus specific hemolysin); if complement is fixed with the first antigen-antibody union, hemolysis does not occur, but, if complement is not so removed, it causes hemolysis in the second system. See also Bordet-Gengou phenomenon, Wassermann test.CF test;
craniofacial f. stabilization of facial fractures to the cranial base by direct wiring or by external skeletal pin fixation.
crossed f. in convergent strabismus, the use of the right inturned eye to look at objects to the left and the left inturned eye to look at objects to the right, in order to avoid ocular rotation.
eccentric f. a monocular condition in which the line of sight connects the object and an extrafoveal retinal area.
elastic band f. the stabilization of fractured segments of the jaws by means of intermaxillary elastics applied to splints or appliances.
external f. f. of fractured bones by splints, plastic dressings, or transfixion pins.
external pin f. in oral surgery, stabilization of fractures of the mandible, maxilla, or zygoma by pins or screws drilled into the bony part through the overlying skin and connected by a metal bar.
external pin f., biphase pin f. by replacing the rigid metal bar connector with an acrylic bar adapted at the time of reduction of the fracture.
freudian f. See fixation (4).
genetic f. the increase of the frequency of a gene by genetic drift until no other allele is preserved in a specific finite population.
intermaxillary f. f. of fractures of the mandible or maxilla by applying elastic bands or stainless steel wire between the maxillary and mandibular arch bars or other types of splint.mandibulomaxillary f., maxillomandibular f;
internal f. stabilization of fractured bony parts by direct f. to one another with surgical wires, screws, pins, rods, plates, or methylmethacrylate.intraosseous f;
intraosseous f. internal f
mandibulomaxillary f. intermaxillary f
maxillomandibular f. intermaxillary f
nasomandibular f. mandibular immobilization, especially for edentulous jaws, with maxillomandibular splints, attached by connecting a circum-mandibular wire with an intraoral interosseous wire passed through a hole drilled into the anterior nasal spine of the maxillae.
nitrogen f. process in which atmospheric nitrogen is converted to ammonia.


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