midsagittal plane

mid·sag·it·tal plane (md-sj-tl)

n.

See median plane.

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midsagittal plane.

See median plane.

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midsagittal plane (midˈ·saˑ·ji·tl plānˑ),

n a vertical plane through the midline of the body; divides the body into right and left halves. Also called the
median plane.

Midsagittal (median) plane.

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plane,

n an ideal flat surface that intersects solid bodies, extends uniformly in various directions (horizontally, vertically, laterally, or any relative combination thereof), and is determined by the position in space of three points.

Body in anatomic position with median, sagittal, horizontal, and frontal planes noted.

plane, axial,

n a hypothetical plane parallel to the long axis of an object.

plane, axial, of teeth,

n a term that applies to the mesiodistal or the buccolingual plane.

plane, axial wall,

n an instrument used to plane and true the axial wall of a Class 3 preparation.

plane, axiobuccolingual, of teeth,

n See plane of teeth, buccolingual.

plane, axiomesiodistal, of teeth,

n See plane of teeth, mesiodistal.

plane, bite,

n an appliance that covers the palate. It has an inclined or flat plane at its anterior border that offers resistance to the mandibular incisors when they come into contact with it. Also called
bite plate.

plane, Bolton-nasion,

n.pr imaginary surface passing through the nasion and the postcondylar notch, used in cephalometric analysis. See also point, Bolton.

plane, Broca's

n.pr a plane extending from the tip of the interalveolar septum between the upper central incisors to the inferiormost point of the occipital condyle.

plane, brushing,

n the top uniform edge of the bristles on the head of a toothbrush; forms the surface that comes in contact with teeth and gingival margin when brushing. The plane comes in a variety of designs that assist the user to remove plaque and clean the gingiva. Also called
trim.

plane, buccolingual, of teeth,

n a plane that passes through the tooth buccolingually parallel with its long axis. In incisors and canines, this is the labiolingual plane. Also called
axiobuccolingual plane.

plane, Camper's,

n.pr a plane extending from the inferior border of the ala of the nose to the superior border of the tragus of the ear.

plane, coronal,

n the plane created by an imaginary line that divides the body at any level into anterior and posterior portions. Also called the
frontal plane.

plane, eye-ear,

n See plane, Frankfort horizontal.

plane, flush terminal,

n a relationship between primary teeth in which the buccal surfaces of the opposing second molars are aligned when occlusion is centric.

plane, Frankfort horizontal,

n.pr a craniometric plane determined by the inferior borders of the bony orbits and the upper margin of the auditory meatus. It passes through the two orbitales and the two tragions.

plane, frontal,

n the frontal plane, in anatomy, is an imaginary plane that divides the body into anterior (ventral) and posterior (dorsal) halves along the longitudinal (left-right) axis.

plane, guide,

n 1. a mechanical device, part of an orthodontic appliance, having an established inclined plane that, when in use, causes a change in the occlusal relation of the maxillary and mandibular teeth and permits their movement to a normal position.
n 2. a plane developed in the occlusal surfaces of occlusion rims to position the mandible in centric relation.
n 3. two or more vertically parallel surfaces of abutment teeth shaped to direct the path of planement and removal of a remarkable partial denture. Also called
guiding plane.

plane, guiding,

n See plane, guide.

plane, Hamy's,

n.pr a plane extending from the glabella to the lambda.

plane, His's,

n.pr a plane extending from the anterior nasal spine to the opisthion.

plane, horizontal,

n the plane created by an imaginary line that divides the body at any level into superior and inferior portions.

plane, horizontal, of teeth,

n a plane that is perpendicular to the long axis of the tooth and may be supposed to cut through the crown at any point in its length.

plane, Huxley's,

n.pr a plane extending from the nasion to the basion. Also called the
basicranial axis.

plane, mandibular,

n See border, mandibular.

plane, Martin's,

n.pr a plane extending from the nasion to the inion.

plane, mean foundation,

n the mean of the inclination of the denture-supporting (basal seat) tissues. The tissues constituting the denture foundation are irregular in form and consistency, and force may be applied from only one direction if it is to comply with the law of statics, which requires the exertion of force at a right angle to maintain support. Therefore the mean foundation plane forms a right angle with the most favorable direction of force. The ideal condition for denture stability exists when the mean foundation plane is almost at a right angle to the direction of force.

plane, mean occlusal,

n the flat or horizontal plane or position and area between the cutting edge of the teeth.

plane, median,

n See plane, midsagittal.

plane, median sagittal,

n a plane passing through the median raphe of the palate at right angles to the Frankfort horizontal plane.

plane, median-raphe

n the median plane of the head.

plane, mesiodistal, of teeth,

n a plane that passes through the tooth mesiodistally parallel with its long axis. Also called
axiomesiodistal plane.

plane, midsagittal

n the plane created by an imaginary line dividing the body into right and left halves. Also called the
median plane.

plane, Montague's

n.pr the plane extending from the nasion to the porion.

plane, occlusal,

n 1. an imaginary surface that is related anatomically to the cranium and that theoretically touches the incisal edges of the incisors and tips of the occluding surfaces of the posterior teeth. It is not a plane in the true sense of the word but represents the mean of the curvature of the surface.
n 2. a line drawn between points representing one half of the incisal overbite (vertical overlap) in front and one half of the cusp height of the last molars in back. See also curve of occlusion.

plane of reference,

n a plane that acts as a guide to the location of other planes.

plane of teeth,

n for descriptive purposes, three planes are considered in the teeth proper: buccolingual, horizontal, and mesiodistal.

plane, orbital,

n 1. a plane perpendicular to the eye-ear plane and passing through the orbitale.
n 2. the plane that passes through the visual axis of each eye.

plane, sagittal,

n a plane of the body created by an imaginary plane parallel to the median plane.

plane, Schwalbe's

n.pr a plane that extends from the glabella to the inion.

plane, straight terminal,

n See plane, flush terminal.

plane, vertical, of teeth,

n an upright plane that is perpendicular to the horizon.

plane, von Ihring's

n.pr a plane extending from the orbitale to the center of the bony external auditory meatus.