Who reads your CBCT scan, and what gets reported

The clinician who prescribed the scan is responsible for interpreting it. In dentistry there is no automatic radiologist standing behind the machine the way there is in a hospital: the scanner produces a volume, the software hands it to the operator, and the duty to look at all of it sits with the person who decided it was needed. For a third molar case at this practice, that is the operating surgeon.

That responsibility is not limited to the region of interest. The professional position taken by the American Academy of Oral and Maxillofacial Radiology, and echoed by the European SEDENTEXCT guidance, is that the entire imaged volume must be evaluated — every slice that was acquired, not merely the two lower wisdom teeth the referral was written about. If the field of view captured part of the maxillary sinuses, part of the cervical spine, or the airway, those structures were irradiated and therefore have to be looked at.

The practical consequence is the reason this article exists. A scan taken to plan the removal of a lower third molar routinely shows things nobody was looking for, and a patient is entitled to know in advance who will notice them, what will be written down, and where that writing goes.

There is a second reader available and it is worth knowing about. A prescribing dentist or surgeon may refer the volume to an oral and maxillofacial radiologist for a formal written interpretation. That is a specialist who reads images and nothing else, holds board certification in the discipline, and issues a signed report. Referral for a formal read is the ordinary course when a finding is ambiguous, when it lies outside the prescribing clinician's field of practice, or when the imaged anatomy is more than the case required. It adds days rather than weeks, and it produces a document that travels with the patient.

A radiographic interpretation is a structured document rather than a paragraph of impressions. Whether it is written by the operating surgeon in the chart or by a radiologist as a separate report, the same elements have to be present for it to be worth anything to the next clinician who reads it.

• Why the scan was taken — the clinical question in one sentence, because a finding only means something against the question that was asked.
• The technical parameters — machine, field of view, voxel size, exposure settings and the date. These determine what the scan was capable of showing and, just as importantly, what it was not.
• The anatomic extent — what was inside the field of view and what fell outside it. A structure that was never imaged cannot be reported as normal.
• Findings relevant to the clinical question — for a third molar case, the position and angulation of each tooth, root morphology and number, the relationship of the roots to the inferior alveolar canal, the relationship of upper roots to the maxillary sinus floor, bone density, the state of the adjacent second molar, and any follicular enlargement.
• Findings not relevant to the clinical question — the incidental ones, described in neutral language.
• An impression — the reader's conclusion, distinguishing what is certain from what is suspected.
• A recommendation — what should happen next, including onward referral and any interval for repeat imaging.

The distinction between a finding and an impression matters more than it sounds. A finding is what is visible: a well-defined radiolucency, 9 millimetres, at the distal aspect of the crown. An impression is what the reader believes it to be. Careful reports keep those separate, because the next clinician may disagree with the impression while relying entirely on the finding. A report that offers only conclusions is difficult to build on and impossible to audit.

Language of uncertainty is part of the craft, not a hedge. "Consistent with" is weaker than "diagnostic of", and "cannot be excluded" is weaker still. A reader who writes that a lesion is consistent with a dentigerous cyst but that a keratocystic process cannot be excluded on imaging alone is telling you something exact: imaging has reached its limit and histopathology is the next step. That sentence is doing real work and is not evasion.

An incidental finding is something visible on the scan that nobody was looking for, lying outside the clinical question the imaging was ordered to answer. On dental CBCT they are common rather than exceptional: published series examining maxillofacial volumes report incidental findings in roughly one quarter to more than half of scans, with the rate rising as the field of view gets larger, and a much smaller subset of those requiring any intervention at all.

A wide range of things fall into that category. Mucosal thickening or a retention pseudocyst in the maxillary sinus is among the most frequent, and in an adult with no symptoms it is usually of no consequence. Calcification of the carotid artery may appear where the field of view reaches the level of the third and fourth cervical vertebrae. Airway narrowing, tonsilloliths, sialoliths in a salivary gland, degenerative change at the temporomandibular joint, idiopathic osteosclerosis, unerupted supernumerary teeth, periapical lesions on teeth other than the ones under discussion, and anatomical variants of the sinus septa all turn up regularly.

The rule that governs all of them is simple to state and occasionally awkward to follow: a finding that is seen is documented, whether or not it is convenient, whether or not it changes the surgical plan, and whether or not the patient came in asking about it. Silence is not a neutral option. Once a volume has been acquired, a finding present in it has been imaged, and an unreported finding is a failure of the interpretation rather than a discretion exercised.

Documented does not mean alarming. Most incidental findings are described, given a plain-language explanation, and require nothing further. The proportion that alters management is small. Telling a patient about mucosal thickening is not the same as telling them something is wrong, and a careful reader says which of the two is happening.

This practice treats third molars and provides anaesthesia. That is the whole scope. The interpretation of your scan is therefore complete in one direction and deliberately limited in another, and it is more honest to say so plainly than to leave the boundary implied.

Within scope, the reading is detailed: the position and angulation of each third molar, the number and shape of the roots, whether the roots are curved or bulbous or fused, the exact relationship between the lower roots and the inferior alveolar canal in three planes, cortication of that canal, the position of the lingual plate, the relationship between upper roots and the sinus floor, the width of the follicular space, bone density that will predict how the tooth behaves during removal, and the airway and anatomical features that bear on an anaesthetic plan.

Outside scope, the finding is described, the patient is told, and the referral goes to a clinician who manages that thing. Carotid calcification goes to a physician, not to a dentist, because the relevant assessment is vascular. Sinus disease that appears to be more than incidental mucosal thickening goes to an otolaryngologist. Periapical pathology on a tooth other than the third molars goes back to the general dentist or to an endodontist. A lesion beyond a follicular cyst on a wisdom tooth goes to a surgeon who treats pathology. Degenerative joint change goes to a clinician who manages the temporomandibular joint.

There is no soft version of this. A practice limited to third molars is not the right place to monitor a sinus, follow a joint, or reassure anyone about an artery, and the value of naming the limit is that a patient knows the finding has an owner. What this practice does is make sure the finding is written down, explained, and handed to someone whose scope covers it — and then follow up that the handoff was received rather than assuming it.

The same scan can be read by different people for different purposes, and the differences are worth understanding before you assume that one reading replaces another.

These readings do not conflict so much as answer different questions. A surgeon may correctly say the canal relationship is high-risk while a radiologist's report devotes a paragraph to a sinus septum and a sentence to the teeth. Neither is incomplete; each is scoped. Problems arise only when a patient assumes one reading was comprehensive because it was thorough.

The referring dentist receives a written letter that states the findings on the scan relevant to your third molars, the surgical recommendation and its reasoning, any incidental findings and the onward referral made for them, and the anaesthetic approach planned. Where the dentist's system can accept it, the imaging itself is shared alongside the letter rather than described secondhand.

That letter is not a courtesy. Your general dentist holds the rest of your mouth and will be the clinician deciding, months from now, whether the second molar in front of an extracted wisdom tooth needs restorative attention or periodontal management. A dentist who receives only the sentence "lower thirds removed" cannot plan around what the scan showed. A dentist who receives root morphology, the canal relationship, what was found in the sinus and what was referred can.

The timing matters as much as the content. A letter that arrives before treatment lets the referring dentist raise an objection or add context — a restorative plan already underway, a tooth already being watched — while the plan can still change. A letter that arrives only after surgery is a record, not a conversation.

If the referral came from somewhere other than a general dentist, or you arranged the consultation yourself, the same document exists and goes wherever you nominate. Nominate somebody. A written interpretation held only by the practice that produced it does very little for you when you move cities, change dentists, or need someone to look at the same anatomy in four years.

• The clinical question the scan was ordered to answer
• Findings on the third molars, including root anatomy and the relationship to the inferior alveolar canal and maxillary sinus
• Incidental findings, described in neutral terms, and where each was referred
• The recommendation, including the option of not operating and the reasoning either way
• The anaesthetic approach and any factor in your history that shaped it
• The date and technical parameters of the scan, so a future clinician knows what was imaged and how

Ask for it in writing and the practice provides it. Under the HIPAA right of access at 45 CFR 164.524 a patient may request their designated record set, which includes diagnostic images and the written interpretation, and the request must be answered within 30 days. Florida adds its own record-access provisions for dental records under Chapter 466. You do not have to give a reason, and the request does not need to go through anyone else.

Ask for two distinct things, because they are not interchangeable. The first is the DICOM data — the raw volume, the file format every dental and medical imaging system reads. Supplied on a disc or as a download, DICOM lets any future clinician open the scan in their own software and re-slice it in any plane. The second is the report or chart interpretation, the written document describing what was seen. A stack of images without an interpretation loses the reasoning; an interpretation without the images cannot be checked.

A screenshot, a PDF of three panels, or a photograph of a monitor is not a copy of your scan. Those are useful for a conversation and useless for a second opinion, because a second reader needs to move through the volume themselves rather than accept the slices somebody else chose. If what you are handed is a set of flat images, say that you want the DICOM as well.

Store it somewhere that will still exist in a decade. Discs fail, laptops are replaced, and imaging software changes. Copy the DICOM folder to cloud storage you control the day you receive it and keep the written interpretation in the same place. A second opinion is considerably more straightforward when the scan travels with you, and it spares you a repeat scan and a repeat radiation dose taken only because the first one could not be found.

Requesting your imaging is also the thing that makes a genuine second opinion possible. Another surgeon reading the same volume can reach a different conclusion about the canal relationship or about whether removal is indicated at all, and that disagreement is informative. It is much harder to obtain when the second surgeon has to start by taking their own scan.

Interpretation has boundaries, and a reader who states them is more useful than one who does not. Three come up repeatedly.

Imaging does not establish tissue diagnosis. A radiolucency around an unerupted third molar is characterised by shape, margin, corticated outline and relationship to the crown, and those features make some diagnoses far more likely than others. They do not make one certain. Where certainty matters clinically, tissue does the work that pixels cannot.

Imaging predicts risk without determining the outcome. A close relationship between a root and the inferior alveolar canal — loss of cortication, deviation of the canal, root grooving — raises the probability of nerve disturbance during removal and legitimately changes the surgical approach, including whether a coronectomy is discussed. It does not tell anyone what will happen in a given case, and no report should be read as though it does.

Imaging does not decide whether to operate. A scan describes anatomy. The decision to remove an asymptomatic third molar, or to monitor it, is made from symptoms, examination, the state of the tooth in front, your age, your medical history and what you want, with imaging as one input among several. A tooth that looks difficult on a scan is not thereby a tooth that has to come out.