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Related to horizontal angulation: vertical angulation
Etymology: Gk, horizein, to encircle; L, angularis, angle
the angle within the occlusal plane, relative to a reference in the vertical or sagittal plane, at which the central x-ray beam is directed during radiography or dental imaging of oral structures. Compare vertical angulation.
The position of the dental x-ray tube head in the horizontal plane. To avoid errors in x-ray interpretation, the central ray is directed perpendicular to the curve of the dental arch and film. Correct horizontal angulation produces a radiograph with “open” contacts. Incorrect horizontal angulation produces a radiograph with “overlapped” contacts.
See also: angulation