ADA NBDHE Dental Hygienist

Category - Provision of Clinical Dental Hygiene Services

In the Paralleling Technique, how is the central ray directed?
  1. Perpendicular to the occlusal plane
  2. Parallel to the long axis of the tooth
  3. Perpendicular to the angle halfway between the long axis of the tooth and the film
  4. Perpendicular to the long axis of the tooth
Explanation
Answer: D - In the Paralleling Technique, the central ray is directed perpendicular to the long axis of the tooth.
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