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Occlusal Detections

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Clinical Tip #11

Unless your work environment is a pediatric office, or in an oral surgeon’s office, you will not be requested to take many occlusal projections. However, it is important to remember how this task is achieved, because intermittently in your career you will be asked to take occlusal projections. You must be ready for all types of radiography.

Definitions

Bisecting the angle technique: The vertical angulation of the tube head is directed so that the central ray is perpendicular to an imaginary line that bisects the angle formed by the long axis of the tooth and the plane of the film.

Buccolingual dimension: If trying to figure out if the impacted tooth is on the buccal or lingual side of the jaw bone, a right angle projection can be used for diagnosis. …show more content…

Foreshortened image: Excessive vertical angulation causes shortening of the tooth image on the film.

Imaginary bisecting line: The line that bisects the angle formed by the long axis of the tooth and the film packet.

Headrest position: Proper position of the patient’s head for radiographic exposure.

Horizontal angulation: The central ray is directed perpendicular to the film in the horizontal plane.

Negative angulation: Used on the mandibular arch; pointing the PID up (negative degrees).

Occlusal film packet: A large intraoral film packet (#4), placed on occlusal surfaces upper/lower teeth to show objects in the 3rd dimension.

Occlusal plane orientation: An imaginary plane formed by occlusal contact of the upper and lower teeth.

Occlusal projection: A film showing mandibular or maxillary and portrays larger object area or a right angle (axial) relationship of the objects.

Overlapped image: A film with superimposed teeth on each other due to excessive horizontal angulation.

Positive Angulation: Used on the maxillary arch, when the PID is pointing downwards (positive

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