Bitewing Frequency — MFDS Part 1 MCQ

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ModerateRadiologyBitewing FrequencyMFDS Part 1

For an adult assessed as being at high caries risk, posterior bitewing radiographs are clinically justified for monitoring approximal caries. According to the FGDP Selection Criteria, at what interval should they be repeated until the patient's caries-risk category reduces?

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Correct answer: C — 6 months

The correct answer is C: 6 months. The FGDP Selection Criteria recommend 6-monthly posterior bitewing radiographs for adults who remain at high caries risk, provided each exposure is clinically justified. This interval continues until reassessment shows that the patient's risk category has reduced. A 12-month interval is appropriate after reduction to medium risk, so option A is premature while high risk persists. Intervals of 24 or 36 months are too long for an adult with ongoing high caries risk. Option B is incorrect because clinical examination alone may not detect approximal caries where posterior contacts cannot be adequately inspected, although radiographs must never be prescribed automatically without individual justification.

Reference: NHS England. NHS dentistry: care pathways guidance, section 6.2, Final review and assessment. Published 8 July 2026; updated 23 July 2026. https://www.england.nhs.uk/long-read/nhs-dentistry-care-pathways-guidance/