Occlusion

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Related to occlusal: occlusal adjustment

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.
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 It might be outdated or ideologically biased.

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

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 ?
Occlusal bite paper/articulating paper were used to assess the contacts of teeth during dynamic occlusal relationship.19 These were measured with stainless steel scale.18Static occlusal relationship was checked during intraoral examination.
Occlusal plane was traced by drawing a line passing through the intercuspation of upper and lower teeth.
peak force) while wearing an occlusal splint during handgrip tests.
The measurement (in millimeters) was performed with teeth in occlusion and the probe parallel to the occlusal plane.
After 20 adolescent patients taken orthodontic treatment, the change of distance from upper lip to esthetic plane had a positive correlation with posterior occlusal plane (r=0.365), distance from lower lip to esthetic plane was positively related to posterior occlusal plane (r=0.278), the plane was negatively correlated with nasolabial angle (r= 0.742), the upper lip tension had a positive correlation with the plane (r=0.419), distance from lower lip to H line was positively correlated (r=0.108), upper lip base thickness, chin soft tissue thickness and the plane had no correlation, Z angle was negatively correlated with the posterior occlusal plane (Table I).
The restoration was examined for any occlusal interference using ceramic finishing instruments (Figure 8).
A prefabricated intermediate occlusal splint was placed in order to position the mandible into its final predetermined position.
36 people were treated with the gothic arch tracing method (group 1:23 women with an average age of 58.4) and 36 people were treated with the wax occlusal rims method (group II, 18 women with an average age of 61.7).
The purpose of this in vivo study was to investigate the position of mandibular condyles during wearing of occlusal splint with the use of the ultrasound jaw tracking device with six degrees of freedom, and to determine the influence of splint thickness on the condylar position.
Previous studies have shown that changes in occlusal contacts may lead to functional disharmony between the masticatory muscles and the temporomandibular joint, resulting in excessive intra-articular pressure, a set of micro and macro traumas and subsequent joint degeneration, characteristic of TMD35.
Along with clockwise or anti clockwise rotational change in the jaw position and sagittal position of point N, the ANB may be affected by vertical position of point N, the upward or downward rotation of the Sella-Nasion plane, the age of the patient, the relation of Sella-Nasion plane to the occlusal plane, the degree of prognathism of jaws and the recording errors16.
Because of their multiracial background, the members of the Puerto Rican population could present with certain occlusal characteristics that vary from those found in individuals belonging to US national or international populations.