In the paralleling technique for periapical radiography, how is the central ray directed?

  • Correct answer

    Perpendicular to both the receptor and the long axis of the tooth

  • Perpendicular to the line bisecting the angle between the tooth and the receptor

  • Parallel to the occlusal plane regardless of receptor position

  • Perpendicular to the occlusal plane

This question is one of 15 in AFK practice: Oral medicine, pathology and radiology. Test yourself on all of them.

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Explanations

  • In the paralleling technique the receptor is placed parallel to the long axis of the tooth and the beam is directed perpendicular to both, minimizing geometric distortion. Aiming at the bisector of the tooth-receptor angle describes the bisecting-angle technique.

    Source: White and Pharoah's Oral Radiology — oneguy

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