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Related to CRAO: Aion, CRVO


The relationship of the masticatory surfaces of the maxillary teeth to the masticatory surfaces of the mandibular teeth when the jaws are closed.
(computer science)
In computer vision, the obstruction of a view.
The retention of undissolved gas in a solid during solidification.
A closing or shutting up.
Adhesion of gas or liquid on a solid mass, or the trapping of a gas or liquid within a mass.
The deficit in muscular tension when two afferent nerves that share certain motor neurons in the central nervous system are stimulated simultaneously, as compared to the sum of tensions when the two nerves are stimulated separately.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the absorption of a substance from a gaseous medium by solids or melts. During occlusion, gases are absorbed by the entire volume of the absorbent rather than by the surface layer. In this sense, occlusion is similar to absorption, which is the dissolution of gases in liquids.

The most common type of occlusion involves the absorption of gases by metals; for example, hydrogen is occluded by metals of Group VIII of the periodic table of elements. At room temperature, one volume of iridium absorbs more than 800 volumes of hydrogen, and one volume of palladium absorbs more than 700 volumes of hydrogen. The occluded gas interacts with the metal to form a solid solution; sometimes a part of the gas combines with the metal to yield other chemical compounds, for example, hydrides and nitrides.



(also bite), the relationship between the surfaces of the upper and lower teeth when in contact. The various forms of occlusion are established only when all the permanent teeth are present. With normal occlusion, each upper tooth, except the central incisors and the wisdom teeth, must touch the corresponding bottom tooth and the tooth behind it when the jaws are in contact. The sagittal surface passes between the central incisors of the upper and lower jaws.

There are four types of physiological occlusion. With orthognathous occlusion, the front teeth of the upper jaw cover the corresponding teeth of the lower jaw. Biprognathous occlusion is similar but with a more pronounced slant forward of the upper and lower teeth and of the alveolar processes. With a straight bite, the front teeth close on the edges of the incisors, and with an opisthognathous bite, the front teeth of both upper and lower jaws are inclined backward.

Pathological occlusion, which includes overbite, decreases the chewing efficiency of the teeth. It may be a congenital anomaly of development of the dentomaxillary system or a result of tooth removal or jaw disease or injury.


Gavrilov, E. I., and I. M. Al’shits. Ortopedicheskaia stomatologiia. Moscow, 1970.
Kurliandskii, V. Iu. Rukovodstvo k prakticheskim zaniatiiam po ortopedicheskoi stomatologii, 3rd ed. Moscow, 1973.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

occluded front

occluded frontclick for a larger image
Fronts formed by the merging of cold and warm fronts. If a cold front overtakes a warm front, the result would be an occluded front. Also known as a frontal occlusion or an occlusion. See also front.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
In conclusion, OCTA is a new, fast, noninvasive imaging technology that has enabled improved understanding of the pathophysiology of many retinal vascular diseases including combined CRAO and CRVO.
Natarajan, "Combined crvo with crao in a patient with protein C deficiency," Retinal Cases and Brief Reports, vol.
The swinging light test will reveal an RAPD; (1,2) fundoscopy findings typically include disk edema and disk hemorrhages, or a pale retina if GCA is associated with CRAO. (6) Testing, including an erythrocyte sedimentation rate and a C-reactive protein, will provide supportive evidence, and biopsy of the temporal artery will confirm the diagnosis.
ET is among the underlying hematologic disorders in patients with CRAO. Our aim was to share our observations with the ophthalmic and hematologic communities, and to increase the awareness of the possible etiological role of ET in CRAO.
In all patients over 50 years who have CRAO, it is essential to rule out temporal arteritis.
All CRAO patients were posted for paracentesis.1% pilocarpine was instilled 1 hour before the procedure.
In addition, we recorded current medication, demographic data, the onset of initial CRAO symptoms, and the time of paracentesis.
The patient was diagnosed with CRAO, which was probably induced by mechanical press of SO itself or raised IOP He was treated with partial removal of SO (1cc) by limbal incision and injection of air into the anterior chamber immediately.
A CRAO is an ophthalmic emergency and patients should receive active treatment in the acute phase.
The present manuscript uses OCT-A to identify the pathologic features in two illustrative cases of CRAO. In both patients, OCT-A was performed using the commercially available Cirrus 5000 with AngioPlex (Zeiss, Jena, Germany) with no subsequent image processing.
In a CRAO, the blockage may occur at any point between the origin at the ophthalmic artery and the optic disc head.
Ocular pathology may, however, present in this way if loss of vision in one eye has gone unnoticed until the second eye becomes affected, for example exudative AMD or CRAO in temporal arteritis.