Lateral Cephalogram Use — MFDS Part 1 MCQ
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Correct answer: E — Analysis of skeletal and dentoalveolar relationships before orthodontic or orthognathic treatment
Explanation lettering: C = shown as A · E = shown as C · A = shown as E
A is correct. A lateral cephalometric radiograph permits analysis of anteroposterior and vertical skeletal and dentoalveolar relationships in selected orthodontic cases and during orthognathic treatment planning. UK NHS imaging criteria specifically identify significant skeletal discrepancy with imminent orthodontic or surgical planning as a potential indication; the exposure is not justified routinely for every orthodontic patient. Bitewing radiographs are used principally for posterior approximal caries detection. Intraoral periapical radiographs are more appropriate for detailed periodontal bone-level assessment and endodontic working-length determination. Impacted mandibular third molars are usually assessed initially with panoramic imaging, with CBCT considered only when additional three-dimensional information is justified. Therefore, A is the single best answer.
Reference: Newcastle upon Tyne Hospitals NHS Foundation Trust, Imaging Referral Criteria for Newcastle Dental Hospital, Orthodontics section, version 2.3, August 2023. https://www.newcastle-hospitals.nhs.uk/wp-content/uploads/2020/10/Imaging-Referral-Criteria-for-Newcastle-Dental-Hospital_v2.3-1-1.pdf