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Paper A RevisionUpdated 202610 min read

Dental Radiology & Imaging for ORE Part 1

High-yield summary of intraoral radiograph techniques, panoramic positioning artifacts, CBCT, and CGDent audit standards.

Key Syllabus Concepts Tested in Dental Radiology & Imaging

  • Paralleling technique with beam aiming device eliminating geometric image magnification
  • Panoramic positioning errors: Chin low (exaggerated smile line) vs Chin high (frown line/flat palate)
  • Cone Beam CT (CBCT) 3D cross-sectional imaging for implant placement near nerve canals
  • CGDent quality audit standards: ≥70% Grade 1 (excellent) and ≤10% Grade 3 (unacceptable)

Sample SBA Practice Questions

Sample Question 1 (Paper A)

According to IRMER 2017, who holds clinical responsibility for justifying a dental radiograph?

  1. The IR(ME)R practitioner, the registered dentist who authorises the exposure
  2. The referrer, who requests the film and supplies the clinical information
  3. The operator, who selects the exposure factors and takes the image
  4. The medical physics expert, who advises on patient dose and equipment performance

✅ Correct Answer: The IR(ME)R practitioner, the registered dentist who authorises the exposure
Explanation: The IRMER Practitioner is legally responsible for weighing diagnostic benefit against radiation risk and justifying exposure.
Clinical Pearl: Optimal community water fluoridation concentration in the UK is 1.0 ppm (1 mg/L).

Sample Question 2 (Paper A)

What is the primary advantage of replacing a round X-ray PID collimator with a rectangular collimator?

  1. Removes the risk of cone-cutting on the film
  2. Halves the exposure time needed per film
  3. Improves image contrast by cutting scatter to the receptor
  4. Reduces patient radiation dose by more than 50%

✅ Correct Answer: Reduces patient radiation dose by more than 50%
Explanation: Rectangular collimation restricts beam dimensions, reducing irradiated tissue volume and patient dose by 50-60%.
Clinical Pearl: High caries risk patients aged 10+ should be prescribed 2,800 or 5,000 ppm NaF toothpaste.

Sample Question 3 (Paper A)

Under CGDent Guidelines, what is the maximum acceptable percentage of Grade 3 (unacceptable) radiographs in a clinical audit?

  1. 15%
  2. 10%
  3. 20%
  4. 5%

✅ Correct Answer: 10%
Explanation: CGDent quality targets state that no more than 10% of radiographs should be Grade 3 (unacceptable).
Clinical Pearl: MCA 2005 Principle 1: An adult must be assumed to have capacity unless established otherwise.

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