Occlusion

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Related to arterial occlusion: venous occlusion

occlusion

[ə′klü·zhən]
(anatomy)
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.
(engineering)
The retention of undissolved gas in a solid during solidification.
(medicine)
A closing or shutting up.
(meteorology)
(physics)
Adhesion of gas or liquid on a solid mass, or the trapping of a gas or liquid within a mass.
(physiology)
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.

Occlusion

 

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.


Occlusion

 

(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.

REFERENCES

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.

A. I. RYBAKOV

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.
References in periodicals archive ?
Of 63 patients with a prenatal diagnosis of suspected placenta accreta, 39 had prophylactic arterial occlusion by either intraoperative embolization or hypogastric balloon inflation.
A PubMed search showed that only 2 cases of retinal arterial occlusion associated with ET have been published (2), (3).
In contrast to patients with retinal arterial occlusion, those with NAAION are not at an increased risk of early death from systemic vascular disease.
Methods: A total of 36 patients (13 female, 23 male) with acute lower extremity arterial occlusion, who admitted to our clinic at least 12 hours after onset of symptoms were enrolled to the study and investigated retrospectively.
The expert opined that if the arterial occlusion had been discovered earlier, more likely than not, the leg could have been saved, and that the failure of the nurses to appropriately monitor the decedent resulted in their failure to detect the arterial thrombosis at or near the time it occurred.
Toray had obtained marketing approval for beraprost sodium tablets to be indicated for improvement of ulcer, pain and feeling of coldness associated with chronic arterial occlusion in January 1992, primary pulmonary hypertension in September 1999, and it has already been available in Japanese market as Dorner(R) Tablets by Astellas since April 1992.
Alfimeprase was being tested as a treatment for peripheral arterial occlusion and catheter occlusion, blood clots deep in the legs or that block catheters used to deliver drugs like chemotherapy.
Those on clopidogrel had a 36% lower risk of dying or having another infarct-related arterial occlusion or second MI by the eighth day of hospitalization or discharge.
has begun patient enrollment in a Phase 3 trial of its lead product candidate, alfimeprase, for the treatment of acute peripheral arterial occlusion (PAO), or "leg attack.
Pythiosis can also be a systemic disease involving the vascular system, which usually causes arterial occlusion.
It was recognized that in meeting the desired physical tourniquet characteristics a trade-off may be necessary in that smaller, narrower tourniquets require greater circumferential pressures for arterial occlusion and may be associated with an increased risk of tourniquet related injury.
After the positive outcome of our recent FDA meeting to discuss the Phase 3 trial design for alfimeprase for the treatment of patients with acute peripheral arterial occlusion (PAO), we are more convinced than ever that this product represents a major opportunity for Nuvelo and our shareholders," said Dr.