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Anatomy & Histology · single question

When using the paralleling technique for a periapical radiograph of the maxillary premolars, all of the following are correct EXCEPT:

  1. Position the sensor/film as far posteriorly as possible, regardless of which premolar area is being imaged
  2. Position the film/sensor approximately parallel to the long axis of the teeth
  3. Position the film edge approximately 1 mm apical to the incisal/occlusal plane as appropriate for the region
  4. Ensure the image captures the distal portion of the canine for a complete premolar series
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Correct answer: A. Position the sensor/film as far posteriorly as possible, regardless of which premolar area is being imaged

The paralleling technique's defining feature is positioning the film/sensor parallel to the long axis of the teeth being imaged (not simply 'as posterior as possible' regardless of the specific area of interest) — sensor/film position should be centered appropriately for the maxillary premolar region specifically, capturing the distal canine landmark and proper apical extension, rather than being shifted to an arbitrary extreme posterior position.

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