The film is positioned in the mouth perpendicular to the long axis of the tooth being radiographed, in accordance with the fundamental principles of the paralleling technique.
The parallel technique is the alignment of the central axis of the X-ray source so that it is perpendicular to both the plane of the film and the object being investigated. Unfortunately, aligning the X-ray central axis perpendicular to the film is much easier than to the object. The paralleling approach is defined by two fundamental principles: The x-ray beam is directed at right angles (perpendicular) to the film or sensor and the long axis of the teeth being radiographed in (1) and (2), respectively.
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