vibrating line

vi·brat·ing line (vbrtng)

n.

The imaginary line across the posterior palate, marking the division between the movable and immovable tissues.

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line,

n a boundary; demarcation.

line angle,

n See angle, line.

line, basophilic,

n a group of microscopic sections of bone that stains darkly with hematoxylin. Represents periods of bone inactivity.

line, Camper's,

n.pr the line running from the inferior border of the ala of the nose to the superior border of the tragus of the ear.

line, cement,

n the line of cement exposed at the margin of an inlay or crown.

line, cementing,

n a basophilic line distinguishing adjacent lamellae of bone; represents periods of inactivity of bone formation and resorption.

line, cervical,

n See junction, cementoenamel.

line, cross arch fulcrum,

n See line, fulcrum, cross arch.

line, external oblique,

n a ridge of osseous structure on the body of the mandible extending from the anterolateral border to the mandibular ramus, passing downward and forward, after covering the buccocervical portion of the mandibular third molar, and ending by blending into the molar teeth.

line, finish,

n in cavity preparations, a minimal line of demarcation of the wall of the preparation at the cavosurface angle; usually results from a slice made by an abrasive disk.

line focus,

n a principle employed in the design of radiographic tubes, by which the effective focal spot is sharply reduced relative to the actual (larger) focal spot desirable to deal with the heat generated. It involves focusing the cathode stream, in the pattern of a thin rectangle, onto an anode truncated at about 20° to the transverse axis of the tube. See also spot, focal, effective.

line, fulcrum,

n an imaginary line around which a removable partial denture tends to rotate.

line, fulcrum, anteroposterior,

n an imaginary line of rotation extending through the rest and other support areas along the same side of a removable partial denture.

line, fulcrum, cross arch,

n an imaginary line through the tooth-supported rest areas nearest to soft tissue-supported areas and around which the partial denture will tend to rotate when forces are applied to the soft tissue-supported areas.

line, lead,

n a bluish-black patch on the gingival tissues, usually about 1 mm from the gingival crest. Caused by the deposition of fine granules of lead sulfide in the tissues. A sign of lead absorption in lead poisoning (plumbism).

line, median,

n the intersection of the midsagittal plane with the maxillary and mandibular dental arches. The center line divides the central body surface into right and left.

line, mercurial,

n a linear area of abnormal pigmentation of the gingival tissues associated with mercury poisoning. Seen along the gingival margin, it has been variously described as bluish, brownish, dirty reddish, or purplish in coloration.

line, neonatal,

n the microscopic imbrication line on a primary tooth marking the point at which prenatal growth stops and postnatal growth begins. See line, Owen contour.

line of credit,

n an arrangement whereby a financial institution (bank or insurance company) commits itself to lend up to a specified maximum amount of funds during a specified period. The interest rate on the loan may be specified or not. Sometimes a commitment fee is imposed for obtaining the line of credit.

line of draw,

n the direction or plane of withdrawal or seating of a removable or cemented restoration.

line of force,

n See force, line of.

line of occlusion,

n the alignment of the occluding surfaces of the teeth in the horizontal plane. See also plane, occlusal line.

line of Retzius,

n.pr one of several microscopic incremental lines appearing in the mature enamel.

line, Owen contour,

n.pr one of a series of adjoining microscopic imbrication lines in dentin that demonstates a disturbance in body metabolism. See line, neonatal.

line, petrous

(pet´rs),
n the line traced around the hard, dense portion of temporal bone that forms a case protecting the inner ear.

line printer,

n a fast printing device. A line printer prints on paper each line of characters in one operation, rather than character by character.

line, protrusive,

n one of the three tracings made on each of the six projection planes of a jaw motion data recorder.

line, survey,

n a line produced on the various portions of a dental cast by a surveyor, scriber, or marker. It designates the greatest height of contour in relation to the orientation of the cast to the vertical scriber.

line, vibrating,

n the imaginary line across the posterior part of the palate marking the division between the movable and relatively immovable tissues of the palate.