extension (redirected from extension base of benefits)

extension /ex·ten·sion/ (-shun)

1. the movement by which the two ends of any jointed part are drawn away from each other.

2. the bringing of the members of a limb into or toward a straight condition.

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nail extension  extension exerted on the distal fragment of a fractured bone by means of a nail or pin (Steinmann pin) driven into the fragment.

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ex·ten·sion (k-stnshn)

n. Abbr. ext.

1. The act of straightening or extending a flexed limb.

2. A pulling or dragging force exerted on a limb in a distal direction.

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extension

[iksten′shən]

Etymology: L, extendere, to stretch

a "straightening" movement allowed by certain joints of the skeleton that increases the angle between two adjoining bones, such as extending the leg, which increases the posterior angle between the femur and the tibia. Compare flexion.

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extension,

n movement of a limb to increase the angle of the joint. Some joints (at the wrist, in the neck) are able to hyperextend.

extension, bilateral sacral,

n condition in which the sacrum has rotated around a central transverse axis so that the sacral base moves posterior relative to the bones of the pelvis. Also called
sacral base posterior.

extension, craniosacral,

n the movement of the cranial rhythmic impulse, characterized by anterior motion of the sphenobasilar symphysis and posterior motion of the sacrum.

extension, regional,

n straighten-ing of spinal region in the sagittal plane. Also called
Fryette regional extension.

extension, sacral,

n posterior movement of the sacral base relative to the hip bones.

extension, SBS,

n rotation of the occipital and sphenoid bones in opposing directions about parallel transverse axes, thus resulting in inferior positioning of the basilar portions of both bones and a decrease in the posterior convexity between them. Also called
sphenobasilar synchondrosis (symphysis) extension.

extension, unilateral sacral,

n condition involving a one-sided superior sacral shear that results in a shallow sulcus and an ipsilateral upward-forward inferolateral sacral angle.

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extension,

n 1. an enlargement in boundary, breadth, or depth.
n 2. the process of increasing the angle between two skeletal levers having end-to-end articulation with each other; the opposite of flexion.

extension base,

n See base, extension.

extension for prevention,

n a principle of cavity preparation promoted by G.V. Black. To prevent the recurrence of decay, he advocated extension of the preparation into an area that is readily polished and cleaned. The philosophy is no longer used in dentistry.

extension base, gingiva, attached,

n a gingival extension operation; a surgical technique designed to broaden the zone of attached gingiva by repositioning the mucogingival junction apically.

extension base, groove,

n the enlargement of a cavity preparation outline to include a developmental groove.

extension base of benefits,

n an extension of eligibility for benefits for covered services, usually designed to ensure completion of treatment commenced before the expiration date. Duration is generally expressed in terms of days.

extension base, ridge,

n an intraoral surgical operation for deepening the labial, buccal, or lingual sulci.

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extension

1. the movement by which the two ends of any jointed part are drawn away from each other.

2. a movement bringing the members of a limb into or toward a straight condition.

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nail extension

extension exerted on the distal fragment of a fractured bone by means of a nail or pin (Steinmann pin) driven into the fragment.

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extension

The making larger of a thing Imaging The broadening of a lesion–eg, a cancer or focus of infection as seen on an imaging technique Orthopedics A ↑ in the angle between parts of a joint; a straightening of a flexed limb Terminal care See Extension of life.