object-film distance

distance,

n the measure of space intervening between two objects or two points of reference.

distance, cone,

n the distance between the focal spot and the outer end of the cone; usually expressed in inches or centimeters. Modern dental roentgen-ray units usually have cone distances of from 5 to 20 inches (12.5 to 50 cm).

distance, interarch (interridge distance),

n the vertical distance between the maxillary and mandibular arches under conditions of vertical relations that must be specified.

distance, interocclusal (interocclusal gap, free-way space),

n the distance between the occluding surfaces of the maxillary and mandibular teeth when the mandible is in its physiologic rest position. This can be determined by calculating the difference between the rest vertical dimension and the occlusal vertical dimension of the face.

distance, interridge,

n See distance, interarch.

distance, large interarch,

n a large distance between the maxillary and mandibular arches.

distance, long (extended) cone,

n the distance is usually 14 to 20 inches (35 to 50 cm). See also cone, long.

distance, object-film,

n the distance, usually expressed in centimeters or inches, between the object being radiographed and the cassette or film.

distance, operator,

n See positions at the chair.

distance, short cone,

n a focal-skin distance of 9 inches (22.5 cm) or less; usually refers to the distance as determined by the cone supplied by the manufacturer of the basic radiograph unit.

distance, small interarch,

n a small distance between the maxillary and mandibular arches.

distance, target-film (anode-film distance, focal-film distance),

n the distance between the focal spot of the tube and the film; usually expressed in inches or centimeters.

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object-film distance

in the taking of a radiograph the distance between the object and the film; the shorter the distance the sharper the image and the less the magnification.