The principles of the paralleling technique include each of the following except one. Which one is the exception?
A) The image receptor is placed parallel to the long axis of the tooth of interest.
B) The central ray of the x-ray beam is directed perpendicular to the tooth and to the image receptor.
C) The central ray of the x-ray beam is directed at a plane halfway between the long axis of the tooth and the long axis of the image receptor.
D) Parallel placement of the image receptor is accomplished using an image receptor holder.
C
Explanation: A) Directing the central ray of the x-ray beam at a plane halfway between the long axis of the tooth and the long axis of the image receptor describes the principle of the bisecting technique.
B) Directing the central ray of the x-ray beam at a plane halfway between the long axis of the tooth and the long axis of the image receptor describes the principle of the bisecting technique.
C) Directing the central ray of the x-ray beam at a plane halfway between the long axis of the tooth and the long axis of the image receptor describes the principle of the bisecting technique.
D) Directing the central ray of the x-ray beam at a plane halfway between the long axis of the tooth and the long axis of the image receptor describes the principle of the bisecting technique.
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