Final answer:
The positioning method prescribed to demo the right zygomatic arch free of superimposition on an inferosuperior tangential projection is an intraoral technique or a modified Waters view.
Step-by-step explanation:
The positioning method prescribed to demo the right zygomatic arch free of superimposition on an inferosuperior tangential projection is an intraoral technique. In this technique, the dental x-ray film is placed inside the mouth, close to the area being imaged, while the x-ray source is positioned outside the mouth. This allows for a clear view of the zygomatic arch without superimposition.
Another positioning method that can be used is the modified Waters view. This is an extraoral technique where the x-ray beam is directed from below the chin, angling upwards towards the zygomatic arch. This angle helps to minimize the superimposition of other structures, providing a clear view of the zygomatic arch.