Each of the following statements regarding the fundamentals of periapical radiographs is correct except one. Which one is the exception?
A) Periapical radiographs may be taken using the paralleling or bisecting technique.
B) Placement of the image receptor-holding device must be evaluated to avoid angulation errors.
C) The patient's finger can be used to hold a large image receptor in position in the oral cavity.
D) The size of image receptor chosen depends on the shape and size of the dental arches.
C
Explanation: A) An image receptor holder with an external aiming device will assist the radiographer with directing the x-ray beam at the correct angle. Using the patient's finger to hold the image receptor in place during exposure is not acceptable.
B) An image receptor holder with an external aiming device will assist the radiographer with directing the x-ray beam at the correct angle. Using the patient's finger to hold the image receptor in place during exposure is not acceptable.
C) An image receptor holder with an external aiming device will assist the radiographer with directing the x-ray beam at the correct angle. Using the patient's finger to hold the image receptor in place during exposure is not acceptable.
D) An image receptor holder with an external aiming device will assist the radiographer with directing the x-ray beam at the correct angle. Using the patient's finger to hold the image receptor in place during exposure is not acceptable.
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