line angle

angle /an·gle/ (ang´g'l)

1. the point at which two intersecting borders or surfaces converge.

Scapula, showing the lateral, superior, and inferior angles.

2. the degree of divergence of two intersecting lines or planes.

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acromial angle  the subcutaneous bony point at which the lateral border becomes continuous with the spine of the scapula.

axial angle  any line angle parallel with the long axis of a tooth.

cardiodiaphragmatic angle  that formed by the junction of the shadows of the heart and diaphragm in posteroanterior radiographs of the chest.

costovertebral angle  that formed on either side of the vertebral column between the last rib and the lumbar vertebrae.

angle of eye  canthus.

filtration angle  a narrow recess between the sclerocorneal junction and the attached margin of the iris, at the periphery of the anterior chamber of the eye; it is the principal exit site for the aqueous fluid.

iridial angle , iridocorneal angle, angle of iris filtration a.

line angle  an angle formed by the junction of two planes; in dentistry, the junction of two surfaces of a tooth or of two walls of a tooth cavity.

Louis' angle , Ludwig's angle sternal a.

optic angle  visual a.

point angle  one formed by the junction of three planes; in dentistry, the junction of three surfaces of a tooth, or of three walls of a tooth cavity.

angle of pubis  subpubic a.

sternal angle  the angle between the sternum and manubrium.

subpubic angle  that formed by the conjoined rami of the ischial and pubic bones.

tooth angles  those formed by two or more tooth surfaces.

venous angle  the angle formed by junction of the internal jugular and subclavian veins.

visual angle  the angle formed between two lines extending from the nodal point of the eye to the extremities of the object seen.

Y angle  that between the radius fixus and the line joining the lambda and inion.

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line angle

n.

1. The junction of two surfaces of the crown of a tooth.

2. The junction of two surfaces of a tooth cavity.

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angle,

n the degree of divergence of two or more lines or planes that meet each other; the space between such lines. Measured in degrees of an arc.

angle, bayonet former,

n a hoe-shaped, paired cutting instrument; biangled with the blade parallel with the axis of the shaft. The cutting edge is not perpendicular to the axis of the blade. Used to accentuate angles in an “invisible” class 3 cavity.

angle, Bennett,

n the angle formed by the sagittal plane and the path of the advancing condyle during lateral mandibular movement, as viewed in the horizontal plane.

angle board,

n a device used to facilitate the establishment of reproducible angular relationships between a patient's head, the radiographic beam, and the radiograph film.

angle, cavosurface

n the angle in a prepared cavity, formed by the junction of the wall of the cavity with the surface of the tooth.

angle, contact,

n the angle at which a liquid or vapor meets a solid surface; e.g., the angle at which a droplet of water rests on an oily surface.

angle, cranial base,

n the angle formed by a line representing the floor of the anterior cranial fossa intersecting a line representing the axis of the clivus of the base of the skull.

angle, cusp,

n 1. the angle made by the slopes of a cusp with the plane that passes through the tip of the cusp and is perpendicular to a line bisecting the cusp; measured mesiodistally or buccolingually. Half of the included angle between the buccolingual or mesiodistal cusp inclines.
n 2. the angle made by the slopes of a cusp with a perpendicular line bisecting the cusp; measured mesiodistally or buccolingually.

angle, facial,

n an anthropometric expression of the degree of protrusion of the lower face, assessed by measuring the inclination of the facial plane relative to a horizontal reference plane.

angle, former,

n a paired, hoe-shaped cutting instrument that has the cutting edge at an angle other than a right angle in relation to the axis of the blade.

angle, Frankfort-mandibular incisor (FMIA)

n a measure of the mandibular incisor to the Frankfort horizontal plane.

n the degree of slope between the axis-orbital plane and the palatal discluding skidway of the maxillary incisor.

angle, incisal guidance,

n the angle formed with the occlusal plane by drawing a line in the sagittal plane between the incisal edges of the maxillary and mandibular central incisors when the teeth are in centric occlusion.

angle, incisal guide,

n the inclination of the incisal guide on the articulator.

angle, lateral incisal guide,

n the inclination of the incisal guide in the frontal plane.

angle, line,

n an angle formed by the junction of the two walls along a line; designated by combining the names of the walls forming the angle.

angle, occlusal rest,

n the angle formed by the occlusal rest with the upright minor connector.

angle of mandible,

n an angle at the intersection of the posterior and inferior borders of the ramus.

angle, point,

n an angle formed by the junction of three walls at a common point; designated by combining the names of the walls forming the angle.

angle, prophylaxis

n the term for an angled instrument that holds a rubber cup or bristle brush used to polish teeth. It may be either contra- or right-angled. May also be called a
prophy angle.

angle, protrusive incisional guide,

n the inclination of the incisal guide in the sagittal plane.

angle, rest,

n See angle, occlusal rest.

angle, symphyseal

n the angle of the chin, which may be protruding straight or receding, according to type.

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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.