Each of the following may be used to position the patient within the focal trough except one. Which one is the exception?
A) Chin rest
B) Forehead rest
C) Image receptor holder
D) Biteblock
C
Explanation: A) Image receptor holders are not used in panoramic radiography.
B) Image receptor holders are not used in panoramic radiography.
C) Image receptor holders are not used in panoramic radiography.
D) Image receptor holders are not used in panoramic radiography.
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