How to Read a Dental CBCT Report: Every Section Explained and the Red Flags in a Poor One
A Dental CBCT report usually has seven parts: patient and scan details, the clinical question, the technique, image quality, the findings by region, any incidental findings, and an impression with recommendations, especially in cases of jaw pathology or lesion or trauma or TMDs. Read the impression first, check that it answers the question your Dentist asked, then read the findings for the region that matters to you.
A CBCT report can run to two or three pages of dense, technical language. Patients often receive it as an email attachment with no explanation, and many Dentists read the last paragraph and file it. Both approaches miss a lot.
This guide goes through a report section by section. It explains what each part means, what a good version looks like, what to ask your Dentist and which signs suggest that a report has not been done carefully. It does not teach image interpretation, which is a separate skill. It teaches you to read the report that someone else has written.
A Quick Map of a CBCT Report
Formats vary, but most qualified reports follow the same logical order. The table shows what each section is for.
| Section | What it contains | What to look for as a reader |
|---|---|---|
| Patient and scan details | Name, age, date, referring clinician, scan type | Correct identity and date; the right clinician named |
| Clinical question | The reason for the scan, as stated on the referral | That it matches what you or your Dentist actually asked |
| Technique | Field of view, voxel size, how the scan was acquired | A field of view that covers the area of interest |
| Image quality | Comment on motion, metal artefact and any limitation | A statement of limitations where they exist |
| Findings | Description by region: teeth, bone, sinuses, joints, airway | Specific descriptions, tooth numbers and measurements where relevant |
| Incidental findings | Things seen that were not asked about | Whether each is classified and whether follow-up is suggested |
| Impression | A short, prioritised summary | That it answers the clinical question in plain terms |
| Recommendations and sign-off | Further imaging or referral, and the Radiologist's name and qualification | A named, qualified reader and a date |
Patient and Scan Details
This looks like an administrative section, and mistakes here have clinical consequences. Check the name, age, date of the scan and the name of the referring clinician. A report with the wrong side or a wrong patient name has caused real problems, and it is far easier to catch at the top of the page than at the end of a treatment plan.
The Clinical Question
A good report restates on the reason for the scan: "Assessment of the right mandibular third molar and its relationship to the inferior alveolar canal," for instance. If that line does not match the reason you went for the scan, say so, because the report may have been written for a different question. This is also where a vague referral shows itself. A request that said only "CBCT lower jaw" tends to yield a report that begins with the same vague line.
Technique: Field of View and Voxel Size
Two technical terms appear in almost every report, and both are easier than they sound.
Field of view (FOV) is the size of the volume that was scanned. A small field covers a tooth or two, a medium field covers a jaw or part of the face, and a large field covers the face and both jaws. The right size is the smallest one that covers the question. If your concern is the right lower wisdom tooth and the field of view covers only the upper front teeth, the scan has missed its purpose.
Voxel size is the size of the smallest three-dimensional unit in the image, a bit like a pixel in a photograph but with depth. Typical voxel sizes in Dental CBCT range from about 0.1 to 0.4 millimeters. Smaller voxels give finer detail, but they can mean more noise and sometimes a higher dose, so the choice is a balance. For most implant and surgical questions, a moderate voxel size is enough. For fine detail, such as a root canal or a hairline fracture, a smaller one may be chosen.
If you want a broader introduction to what a CBCT scan is and how it is acquired, the complete guide to CBCT scanning in dentistry covers it.
Image Quality
This is the section that is most often missing from a poor report. A careful Radiologist comments when the image limits what can be said. Common issues include:
Movement. The patient moved during the scan, causing double edges and blurred detail.
Metal artefact. Crowns, implants and orthodontic brackets cause bright and dark streaks that can hide the structures beside them.
Incomplete coverage. Part of the area of interest sits at the edge of the field of view.
A sentence such as "Streak artefact from the adjacent restorations limits assessment of the distal root surface" is a mark of a careful report. It tells you what was not seen, which is as important as what was.
The Findings, Region by Region
The findings section is the longest part. A thorough report works through the volume in an orderly way, so nothing depends on where the eye happens to land. The usual order covers the following.
Teeth
Which teeth are present, missing or unerupted, the position of any impacted tooth, the condition of the crowns and restorations, root canal fillings and the signs of disease at the root tip. Tooth numbering should be consistent with the system your Dentist uses.
Alveolar bone and jaws
The height and width of the bone, areas of loss, density and any lesion. For implant planning this is where you find the bone dimensions, and for a lesion it is where the margin, internal structure and effect on surrounding tissue are described.
Nerve canals and foramina
The course of the inferior alveolar canal and the mental foramen in the lower jaw, and the incisive canal in the upper front region. These matter when a procedure comes near them.
Maxillary sinuses and nasal cavity
Whether the sinus lining is thickened, whether there is a cyst, polyp or fluid, and whether the natural drainage opening appears clear. Findings here are common and often harmless, but they should be mentioned.
Jaw joints
The shape of the bony surfaces of the joint, and signs such as flattening or erosion. CBCT shows bone well and soft tissue poorly, so it cannot describe the disc.
Airway and surrounding structures
When the field of view includes them, the upper airway, the cervical spine and soft-tissue calcifications. A report that scrolls only through the teeth when the field of view includes more is incomplete.
Measurements
Measurements in a report, such as bone height above a nerve canal or the distance from a root to the sinus floor, are estimates that come with some uncertainty. In a good scan with a suitable voxel size, they are typically accurate to a fraction of a millimetre to about a millimetre, depending on where the points are placed and how clearly the edges can be seen.
That matters for planning. A surgeon plans a safety margin to allow for it. A report should say where a measurement was taken, ideally on a named slice or reference image, and should not give a precise figure for something whose edge is unclear.
CBCT also has an important limitation on bone density. The grey values on a CBCT are not calibrated in the way medical CT numbers are, so a report that gives an exact "Hounsfield unit" for bone quality should be read cautiously. Descriptions of bone density in qualitative terms are more reliable.
Incidental Findings
An incidental finding is something the scan shows that nobody asked about. The most common examples are sinus changes, calcifications in soft tissue, and variations in the anatomy of the jaws or neck. Most are harmless, and a few are not.
A good report lists each one, says in plain terms whether it is likely benign, and states whether anything further is advised. A line such as "Mucous retention cyst, right maxillary sinus. No action needed unless symptomatic" is useful. A line that says only "Sinus changes noted" is not. What happens when a CBCT shows an incidental finding explains how these are handled once you know about them.
The Impression
The impression is the part most readers should read first. It is a short, prioritised summary, often numbered, which turns pages of findings into the points that matter. A good impression:
Answers the clinical question directly.
Puts the most important finding first.
Uses plain terms where it can.
Is consistent with the findings section.
States any limitation that affects the conclusion.
Here is an illustration of the style, written for a hypothetical case and not taken from any patient:
Illustrative impression
Mesioangular impaction of the right mandibular third molar with close contact to the inferior alveolar canal; the canal cortex is not clearly seen over a short segment.
No periapical or pericoronal lesion.
Mucosal thickening of the right maxillary sinus floor, likely incidental.
Mild streak artefact adjacent to the second molar crown limits assessment of its distal root surface.
Notice that it is short, ranked by importance, specific about the tooth and the structure and honest about a limitation.
Recommendations and the Sign-Off
Some reports end with a recommendation: further imaging with another modality, a clinical or medical referral, a biopsy or a follow-up scan after a given interval. These are suggestions to the referring clinician, and it is the clinician who decides what happens next.
The report should end with the name and qualification of the person who wrote it, and a date. If there is no named, qualified reader, you do not know who interpreted your scan. The difference between a Radiologist and a radiographer explains why that detail matters.
A Short Glossary for Patients
Reports use language that is precise but not friendly. These are the terms you are most likely to meet.
| Term | What it means in plain language |
|---|---|
| Radiolucent | Appears dark on the image: less dense than the surrounding tissue, such as a cyst or air |
| Radiopaque | Appears bright: denser than the surrounding tissue, such as a filling or dense bone |
| Periapical | Around the tip of a tooth root |
| Cortex or cortical plate | The hard outer layer of the jawbone |
| Corticated margin | A thin, dense edge around a lesion, often a sign of slow growth |
| Dehiscence | Missing bone along part of a tooth root, starting at the bone crest |
| Fenestration | A small window-like gap in the bone over a root, with bone still present above it |
| Mucosal thickening | Thickening of the lining of the sinus |
| Retention cyst | A small, dome-shaped fluid-filled swelling in the lining of the sinus, usually harmless |
| Pneumatisation | Expansion of the air-filled sinus into the surrounding bone |
| Impaction | A tooth that cannot come into its normal position |
| Artefact | A distortion in the image, often caused by metal or movement |
| Differential | The short list of conditions that could explain a finding |
| Correlate clinically | The Radiologist is asking the treating clinician to compare the finding with the examination |
If a term in your own report is not here, the plain-English guide to an OPG report covers more of the common wording.
Red Flags in a Poor Report
Not every report is equally careful. These signs are worth a question:
No named reader or qualification. You cannot tell who interpreted it.
No field of view or technique details. You cannot tell what was scanned.
The report covers only the tooth your Dentist named, when the scan includes sinuses, joints or airway.
Generic wording that could apply to any patient. Template text with no tooth numbers or measurements.
Measurements without any reference to where they were taken.
No comment on image quality, despite visible metal or movement on the scan.
The wrong tooth, the wrong side or a different patient name.
Findings and impression that disagree.
Everything described as normal in a case with obvious metalwork, pathology or complex anatomy.
"Clinical correlation advised" as the only comment on a significant finding.
Any of these is a reason to contact the reporting Radiologist, who should be willing to clarify or issue an addendum. If the concern remains, a second opinion on the original DICOM files is a reasonable next step.
How to Read Your Own Report: A Four-Step Method
Read the impression first. It is the part that carries the conclusions.
Check it against your question. Did it answer what your Dentist was trying to find out?
Read the findings for the relevant region, and mark any words you do not understand.
Take your questions to your Dentist. They can place the findings in the context of your mouth, which a Radiologist who has not examined you cannot.
Do not diagnose yourself from a report. A phrase that sounds alarming in isolation is often routine in context, and a phrase that sounds routine can be significant. The report is information for you and your Dentist to use together.
How Long Should a Report Take?
A thorough report takes longer than the scan. The Radiologist has to review hundreds of image slices, make measurements, write the findings and check the result. Why a specialist report takes time and what to expect explains the steps, and why a very fast turnaround is worth a question.
For Dentists: Using the Report in Practice
If you refer scans for reporting, a few habits make the report work harder for you.
Read the impression, then read the findings for your region of interest, then the incidental findings.
Compare the report with your own look at the images. Three questions every Dentist should be able to answer after opening a CBCT offers a discipline for that first look.
Record the report in the patient's notes and note any follow-up recommendation with a date.
Call the Radiologist when a finding is unclear, and ask for an addendum so the record is complete.
Keep the DICOM data with the record, not only the PDF.
The way you write the referral also shapes the report you get back, and a guide for referring Dentists covers that from the other side. For Dentists who want to read the scan themselves, the Basics of CBCT course covers orientation and systematic review.
Frequently Asked Questions
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Patient and scan details, the clinical question, technique, image quality, findings by region, incidental findings, an impression and recommendations, signed by a named Radiologist.
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Start with the impression (when provided), check that it answers your Dentist's question, then read the findings for the relevant region. Mark unfamiliar terms and ask your Dentist to explain them.
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It is the size of the volume that was scanned. The right field of view is the smallest one that covers the clinical question, and the report should state it.
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The smallest three-dimensional unit in the image. Smaller voxels give finer detail but can add noise and sometimes dose, so the choice is a balance.
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Things the scan shows that were not part of the question, such as sinus changes or soft-tissue calcifications. Most are harmless, but a good report lists them and says whether anything further is needed.
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In a good scan, typically within a fraction of a millimeter to about a millimeter, depending on voxel size and how clearly the edges are seen. Surgeons allow a safety margin for that uncertainty.
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Ask your Dentist first. If the report itself is unclear, the reporting Radiologist can clarify it or issue an addendum, and a second opinion on the original files is an option.
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A CBCT can show bone changes that raise a concern, but a diagnosis of cancer needs a biopsy and a clinical assessment. A report may recommend further tests when a finding looks suspicious.
