Posterior film sensor images using the parallel technique for maxillary posterior films the film is placed because it will be placed in the mouth on the surface of one being radiographed ,opposite side of the surface.
If it is placed on the cotton wool before the film is placed for upper teeth and then film is placed for lower teeth.There are some purpose for using this technique that is increased distance between the radiation sources and film to obtain a bundle of parallel rays.
It is 16 inches long receptor distance which is used with the paralleling technique. This is used to position an intraoral receptor in the mouth and maintain the receptor in position during exposure.
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