What to ask before agreeing to a 3D dental scan
A 3D scan (cone-beam CT) is justified when it answers a specific question that a clinical exam and ordinary x-rays cannot, such as the position of bone, nerves and sinuses before implant surgery, a suspected root fracture, an impacted tooth or a complex root-canal problem. ADA and FDA guidance says imaging should be selected for the individual patient after an exam, not ordered routinely, and 3D scans deliver more radiation than standard dental x-rays, so the question to ask is what decision the scan will change.
The five questions
- What question will the scan answer?
- What happens to my plan if the answer is one way or the other?
- Could a standard x-ray answer it?
- How large is the scanned area, and can it be limited to the region in question?
- Who reads the scan, and what happens with incidental findings?
The FDA advises that cone-beam CT be used only when the clinical benefit justifies the dose and that the field of view be limited to the area of interest (FDA). The American Dental Association's selection criteria apply the same principle to all dental imaging (ADA).
When a 3D scan is commonly justified
| Situation | Why |
|---|---|
| Implant planning | Bone width and height; nerve and sinus position |
| Impacted tooth | Position relative to roots and nerves |
| Suspected root fracture not seen on x-ray | Three-dimensional view |
| Complex root canal anatomy or persistent infection | Canals and lesions not visible on flat films |
| Jaw lesions or trauma | Extent |
| Airway or joint assessment in selected cases | By specialist request |
When it usually is not
Routine check-ups, early decay, or "to have a baseline." A scan without a question is dose without benefit.
Dose in perspective
Doses vary widely with machine, settings and field size; a small-field scan may approach a few standard films, while a large-field scan is considerably more. Ask what settings will be used. Pregnancy should be disclosed and discussed.
Incidental findings
A 3D scan shows sinuses, airways and neck structures; findings there sometimes need follow-up with a physician. Ask how the office handles that.
Next step: Request a consultation or call (805) 565-5111. A request is not a confirmed appointment; the office confirms times during its listed hours (Monday to Thursday, 8 am to 5 pm, plus select Fridays).
Five-question card
| Question | Answer |
|---|---|
| What question will the scan answer? | |
| What changes in my plan depending on the result? | |
| Could a standard x-ray answer it? | |
| Field of view: can it be limited? | |
| Who reads it; what about incidental findings? |
Disclosed: pregnancy / previous scans / concerns ________
Guides are general education; an examination is needed for individual advice.
Sources
- Dental Cone-beam Computed Tomography — U.S. Food and Drug Administration
- Oral Health Topics: X-Rays/Radiographs (updated Mar 26, 2026) — American Dental Association
Sources were current when this guide was last updated.
Educational content, not a diagnosis. Please contact the studio to discuss your own situation.