Occlusion

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Related to centric occlusion: balanced occlusion, eccentric 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 ?
Comparison of condylar positions in centric relation and centric occlusion in pre-treatment malocclusion cases.
Quickly reseat the shell and have the patient gently close into centric occlusion.
The mandibular fragment was guided through opening to the closest possible position to centric occlusion and the patient performed various functional movements such as speaking, swallowing, lip licking and cheek sucking to the best of his capability (Figure 5).
Physiotherapy was suggested to assist the patient in improving the symmetrical arc of closure and in finding the centric occlusion position without guiding the mandible manually.
Study of mandibular movement from centric occlusion to maximum intercuspation.
Anterior open bite is said to exist when there is an actual vertical gap between the upper and lower incisors with the teeth in centric occlusion. The etiology of anterior open bite is multifactorial and can be attributed to genetic and environmental traits, reected in pathologic (muscular dystrophy and cleft lip/palate) and developmental factors.
In addition to the clinical examination study casts in centric occlusion were evaluated for assessment of crowding or spacing in every patient.
These are; the existence of a physiological rest position of the mandible which is constant, the recognition of a variable vertical dimension of occlusion and the acceptance of a dynamic, functional centric occlusion. Thus the aim of rehabilitation includes the health of the periodontium, vertical dimension, interocclusal distance, functional balanced occlusion and esthetics.
It is a reproducible position which can be repeatedly arrived at and thus serves as a reliable guide to develop centric occlusion in artificial denture.
Subjects were asked to close their teeth in centric occlusion position.
All radiographs were taken in stand- ing position, with the frankfort horizontal plane paral- lel to the floor, the dentition in centric occlusion and the lips relaxed.