IR(ME)R for Orthodontic Practices: Who Is Responsible for Every X-Ray You Take

Almost every orthodontic patient is X-rayed at least once, and many have more than one set of images over a course of treatment. Each of those images is a medical exposure to ionising radiation, and each is governed by the Ionising Radiation (Medical Exposure) Regulations 2017, known as IR(ME)R. This guide explains IR(ME)R for orthodontic practices in plain English: who the four duty holders are, what the employer must have in writing, how to justify and optimise an orthodontic radiograph, what counts as an accidental or unintended exposure, and what an inspector is likely to ask to see. It is written for practice owners, orthodontists, practice managers and the nurses and radiographers who press the button.

What is IR(ME)R and who enforces it in orthodontics?

IR(ME)R is the set of regulations that protects patients from unnecessary or excessive medical radiation, and it applies to dental X-rays in both NHS and private practice. The Care Quality Commission explains that the regulations set out the responsibilities of the employer, referrer, IR(ME)R practitioner and operator, and that they cover minimising unintended, excessive or incorrect exposures, justifying each exposure so that the benefit outweighs the risk, and optimising diagnostic doses to keep them as low as reasonably practicable. CQC enforces IR(ME)R in England and states that it applies to the independent sector and the public sector alike. Wales, Scotland and Northern Ireland have their own enforcing authorities, so check who inspects you if you work outside England.

The regulations sit alongside a separate set of rules, the Ionising Radiations Regulations 2017 (IRR17), which protect staff and members of the public and are enforced by the Health and Safety Executive. The simplest way to remember the split is that IR(ME)R protects the person in the chair, and IRR17 protects everyone else in the building. A compliant practice needs both, and a radiation protection adviser can help you with the IRR17 side. This article concentrates on IR(ME)R because it is the regime that governs the decision to take an image in the first place.

If you want the patient-facing version of this topic, our guide to orthodontic X-ray radiation answers the questions families ask, and it is worth giving to patients who ask why the practice wants a scan.

Who are the four IR(ME)R duty holders in an orthodontic practice?

The four duty holders are the employer, the referrer, the IR(ME)R practitioner and the operator, and in a busy orthodontic practice one person often holds more than one role. What matters is that each role is defined in writing, that the person holding it is entitled to act in it, and that they have been adequately trained for it. Regulation 10 sets out their responsibilities, and regulation 17 requires that practitioners and operators are adequately trained before they carry out any exposure or practical aspect of one.

A frequent weakness is that the employer role is invisible. The practice owner signs the cheques but has never read the procedures that carry their name. If you recognise that, set aside an hour with the owner and walk through the schedule of employer's procedures, because the legal duty to have them in place sits with the employer, not with the clinician. The same governance thinking features in our guide to a CQC inspection of a dental practice.

What must the employer have in place for dental radiography?

The employer must have written procedures covering the matters in Schedule 2 of the regulations, written protocols for each standard radiological practice, referral guidelines, quality assurance programmes and a system for recording and learning from incidents. Regulation 6 states that the employer must also take steps to ensure the referrer, practitioner and operator comply with those procedures, and that practitioners and operators keep up continuing education and training after qualification, including training on new techniques.

The regulations also require the employer to appoint a suitable medical physics expert and involve them in the way the regulations describe. For a dental practice that is normally arranged through the same external provider that carries out your equipment testing, and the expert is involved as appropriate in advising on optimisation, dosimetry and quality control. Put the arrangement in writing and keep the latest report where you can find it.

How do you justify an orthodontic radiograph?

An exposure may only go ahead if the practitioner has justified it as showing a sufficient net benefit and has authorised it. Regulation 11 lists what the practitioner must weigh: the specific objectives of the exposure and the characteristics of the individual, the total potential diagnostic benefit, the individual detriment the exposure may cause, and the efficacy, benefits and risk of alternative techniques that involve no or less ionising radiation. Justification is therefore a decision about this patient on this day, not a blanket rule that every new patient has a panoramic image.

What does justification look like in a real consultation?

Consider three patients seen on the same day. A twelve-year-old has a retained primary canine and a suspected ectopic permanent canine, so a radiograph that locates the tooth can change the treatment plan. A thirty-four-year-old with mild lower crowding and a recent panoramic image from her general dentist may not need a new one; the right step is to request the existing image and check that it is of adequate quality. A fifteen-year-old half way through treatment has a bracket that keeps failing, and no image is needed to rebond it. In each case the question is the same, namely whether the result of the image will change what you do.

The British Orthodontic Society publishes orthodontic radiograph guidelines, now in a fourth edition, and the BOS advice sheets page lists them alongside its guidance on records, consent and medical emergencies. Your employer's referral guidelines should say which guidance you follow, so that the referrer, practitioner and operator are all working to the same document.

How should the referrer and practitioner record the decision?

Regulation 10 requires the referrer to supply enough medical data for the practitioner to judge the net benefit. In practice that means a short, structured entry on the clinical record: the clinical question, relevant history, whether a previous image exists, and the practitioner's justification and authorisation. A single line such as "OPG to locate upper left canine, no previous imaging, justified and authorised by [name]" is far more useful to an inspector than an unexplained image in the file.

Digital pathways make this easier because the history is already attached to the patient record. Virtual Consultant Online's online assessment captures the patient's goals, concerns and photographs before the first appointment, so the clinician arrives with context rather than starting from a blank page. Our guides on CBCT versus OPG X-rays and the cephalometric X-ray explain what each image is for, which is the starting point for justifying one.

What about pregnancy and breastfeeding?

For an individual of childbearing potential, the person carrying out the exposure must have enquired whether they are pregnant or breastfeeding, if relevant. This is a condition of regulation 11(1)(f), and your written procedures should say who asks, how the answer is recorded and what happens if the answer changes the justification. Teenage patients are the group most likely to be overlooked, because the enquiry feels awkward with a parent in the room. Build a script that works with a young person, offer a private moment where appropriate, and record the outcome. The NHS page on X-rays is a useful plain-language reference to share with families.

How do you optimise radiation doses in an orthodontic practice?

Optimisation means the practitioner and the operator keep every dose as low as reasonably practicable while still producing an image that answers the clinical question. Regulation 12 makes the operator responsible for selecting equipment and methods that achieve this, with regard to quality control, assessment and evaluation of patient dose, and adherence to any diagnostic reference levels the employer has established. A poor image is a double failure: the patient has been exposed and the answer is still missing.

Equipment is part of optimisation. Regulation 15 requires the employer to implement a quality assurance programme for equipment, to undertake testing before first use and performance testing at appropriate intervals, and to keep the inventory described above. Put the next test date in the practice diary so it is never discovered at an inspection. Our article on GDC CPD requirements for the orthodontic team covers the radiography and radiation protection learning that registrants are expected to keep up to date.

What is an accidental or unintended exposure, and what must you do?

An accidental or unintended exposure is one where a patient receives something other than the exposure that was justified and authorised, such as the wrong patient, the wrong examination or a significantly higher dose than intended. Regulation 8 requires the employer's procedures to provide that the referrer, the practitioner and the patient or their representative are informed of a clinically significant unintended or accidental exposure and the outcome of its analysis. It also requires a system for recording analyses of events and potential events, and for taking appropriate action on them.

Where the employer knows or has reason to believe that a person was or could have been exposed to levels significantly greater than those generally considered proportionate in the circumstances, the regulations set a clear sequence. The employer must make an immediate preliminary investigation, notify the relevant enforcing authority immediately unless that investigation shows beyond reasonable doubt that no such exposure occurred, arrange a detailed investigation and dose assessment, and report the outcome and corrective measures within the time the enforcing authority specifies. In England the CQC publishes criteria for notification and guidance on keeping records of investigations.

The regulations value near misses because they reveal weak points before a patient is harmed. A practice that never records any is not necessarily safe; it may simply not be looking. Review the log at team meetings and keep brief minutes of what changed as a result.

What training and records does IR(ME)R expect?

Practitioners and operators must not carry out an exposure, or any practical aspect of one, without being adequately trained, and the employer must keep an up-to-date record of that training that the enforcing authority can inspect. The record must show the dates on which qualifying training was completed and the nature of the training. Trainees can take part in practical aspects under the supervision of a person who is adequately trained, which is how a new dental nurse learns, but the supervision should be written down.

What clinical audits can an orthodontic practice run?

Clinical audit is a legal requirement under regulation 7, and simple audits that repeat annually are usually enough for a small practice. The aim is to show that you measured something, compared it with your own standard and changed what you do. Start with measures that are easy to extract from the clinical record.

Re-audit after you have made changes. A cycle that stops at the first measurement does not demonstrate improvement, and improvement is what clinical audit is for.

What do inspectors and patients actually ask about radiography?

Inspectors tend to follow the paper trail from a single patient. They may pick an image, ask who referred it, who justified it, who took it and how you know that person was trained, then ask to see the procedure that covers it, the last equipment test and the incident log. If those answers connect, the rest of the file is credible.

Patients and parents ask simpler questions: why do I need this, how much radiation is it, and can it wait? A short, honest answer builds trust and supports informed consent. You do not need to quote dose figures from memory. Explain what the image will show, why it will change your plan and that you keep doses as low as practicable. If you want help writing patient information, the structure in our article on the {a('/blog/orthodontic-patient-consent-process', 'orthodontic patient consent process')} works well for radiography as well as treatment.

Six mistakes that put orthodontic practices at risk

None of these is expensive to fix. Most take a morning of focused attention and the discipline to write things down. The payoff is a practice that can explain every image it takes, which protects patients first and the business second.