Paralleling Technique Advantage — ORE Part 1 MCQ
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Reveal the answer and explanation
Correct answer: A — It produces a less distorted image.
Explanation lettering: C = shown as B · B = shown as C · E = shown as D · D = shown as E
A is correct. In the paralleling technique, the receptor is placed parallel to the tooth’s long axis and the central X-ray beam is directed perpendicular to both. This geometry minimises elongation and foreshortening, producing a less distorted and more reproducible image of the tooth and periapical region. B is incorrect because radiation dose depends on exposure factors, receptor sensitivity and optimisation, not inherently on the projection technique. C and D are incorrect because a holder, usually incorporating beam alignment, helps maintain the required receptor and tube-head positions. E is incorrect because accurate receptor and holder placement may be more demanding than with the bisecting-angle technique.
Reference: Yen M, Yeung AWK. The Performance of Paralleling Technique and Bisecting Angle Technique for Taking Periapical Radiographs: A Systematic Review. Dental Journal. 2023;11(7):155. https://pubmed.ncbi.nlm.nih.gov/37504221/