Dental Radiography · NEBDN certificate
Projection and Technique
Intra-oral technique and holders, panoramic preparation, receptors, shielding, and dental CBCT.
Taking the radiograph. It covers intra-oral technique with holders and rectangular collimation, panoramic technique and how the patient is prepared and positioned, image receptors and their properties, and how a projection is selected and shielded — including the dose comparisons that make one choice preferable to another. Dental CBCT and its equipment carry the single largest block of questions in this topic, reflecting how much of the modern guidance is written about it.
What this topic covers
These are the sub-topics the app's 45 questions for this topic are grouped into, with the number of questions on each. They are a fair map of where the weight sits.
| Sub-topic | Questions |
|---|---|
| Dental CBCT technique and equipment | 12 |
| EMQ: Radiographic examination matched to its description | 7 |
| Intra-oral technique, holders and collimation | 7 |
| EMQ: Positioning error matched to its appearance | 6 |
| EMQ: Image receptors and their properties | 5 |
| Projection selection, shielding and dose comparison | 5 |
| Panoramic technique and patient preparation | 2 |
| Image receptors and digital imaging | 1 |
Sub-topics beginning “EMQ” are extended matching questions: one stem, one right answer, and a list of up to 9 options to choose it from. They are testing whether you can discriminate between neighbouring answers, not whether you recognise the right one.
Study guide
The practical topic: choosing the right examination, taking it well, and using the equipment as intended. Dental CBCT carries an unusually large share here, which reflects how much of the current published guidance concerns it.
Choosing and shielding the projection
Selection is a clinical decision with a dose consequence, and the two are examined together.
- Different examinations answer different clinical questions; the assessment asks you to match the examination to what the operator is trying to find out.
- Relative dose comparisons between projections inform selection — the ranking is the examinable part.
- Shielding practice has changed over time; work from current guidance rather than from what a practice has always done.
Intra-oral technique, holders and collimation
The everyday technique, and the equipment that makes it reproducible.
- Beam-aiming holders exist to make the geometry repeatable; questions link holder use to both image quality and dose.
- Rectangular collimation reduces the irradiated area, and the assessment expects you to say why that matters.
- Technique errors have characteristic consequences on the image — this topic overlaps deliberately with Faults and Quality Assurance.
Panoramic technique and preparation
A short but reliably examined block. Most panoramic marks come from preparation, not from the exposure itself.
- Patient preparation, including removal of items that will cast shadows, prevents a large share of panoramic faults.
- Positioning determines whether structures land in the focal trough; errors here produce recognisable, named appearances.
- Extended matching questions on panoramic positioning and preparation faults appear in the Faults topic, so learn the two together.
Image receptors and digital imaging
Receptor type affects dose, handling and image characteristics.
- The receptor types in use have different properties, and questions ask you to match a property to the receptor that has it.
- Handling and infection control differ by receptor type, which is a practical point that gets examined.
Dental CBCT
The largest single block in this topic. CBCT is a different modality with its own justification threshold, not a bigger radiograph.
- CBCT carries its own justification requirements and its own referral criteria, distinct from those for conventional radiography.
- The equipment, the field of view and the operator responsibilities all differ from intra-oral and panoramic work.
- Because CBCT guidance is comparatively recent and still developing, verify anything you memorise against the current published document.
In the exam Expect scenario questions: a described patient, a clinical question, and four plausible examinations. The examinable skill is matching the projection to the diagnostic need at the lowest reasonable dose. Give CBCT more revision time than its topic heading suggests — it carries a disproportionate share of the questions.
This topic's questions are in the app
The free tier does not unlock any of the 45 questions for this topic, so there is no quiz to run here — and publishing one anyway would give away more than the app itself does. The study guide above is free to read in full.
To practise this topic, get the app. Or start with one of the topics that are free here .
For iPhone, iPad and Android.
Carry on with
Physics and Dose
X-ray production, dose quantities and limits, biological effects, justification and optimisation.
IR(ME)R and Legal Duties
Duty holders and their functions, justification and authorisation, employer’s procedures and records.
Faults and Quality Assurance
Image quality rating, positioning, exposure and processing faults, QA testing and reject analysis.
Revise anywhere, with the whole Radiography & Post-Reg bank
This site publishes the app's free sample — 48 of 780 questions, across 4 of 17 topics. Dental Radiography & Post-Reg carries the full bank offline across all 4 certificates, so you can revise on the bus, between patients, or the night before.
- All 780 questions
- Every question across all 4 certificates, including the 13 topics this site cannot unlock.
- 75-question mock test
- Timed at 90 minutes, drawn from one certificate at a time.
- An explanation every time
- Every answer explains itself and cites where it comes from, right or wrong.
- Progress you can see
- History and per-topic results show which certificates still need the work.
For iPhone, iPad and Android.
