Patients smiling for a dental imaging guide

Published April 22, 2026Written by Landmark Dental Care

What to Expect During a Dental CBCT Scan

A dental CBCT (cone-beam computed tomography) scan is a three-dimensional imaging exam used when a dentist needs volumetric information that routine two-dimensional dental X-rays may not provide. You can expect positioning guidance, a brief period of stillness while the scanner rotates, and a review of how the images will be used in planning—after the scan has been justified for a specific clinical question. Exact machines, fields of view and appointment lengths vary; this article does not claim unverified equipment models or dose numbers.

Key Takeaways

  • Prepare by sharing medical history, pregnancy status and prior imaging, and by removing obstructing jewelry or appliances as instructed.
  • Positioning and remaining still matter more than the length of the rotation itself; your team will explain what to expect for your scan.
  • CBCT is not a routine substitute for bitewing or periapical X-rays; it is selected for selected planning or diagnostic needs.
  • After capture, images are reviewed for planning—ask what was seen, what comes next and whether further imaging is anticipated.

How to prepare

Preparation starts with understanding why the scan was recommended. The U.S. Food and Drug Administration advises that dental CBCT should be performed when it is needed to answer a clinical question, after considering whether a lower-exposure alternative could suffice, and after reviewing prior imaging to avoid unnecessary duplicates. Ask your dentist what decision the CBCT is meant to support—such as evaluating bone for a specific procedure, locating anatomy before surgery, or assessing a complex root or jaw concern.

Before the appointment, tell the dental team if you are pregnant or may be pregnant, if you have trouble standing or sitting still, if you have claustrophobia or neck mobility limits, or if you recently had CT, CBCT or other imaging of the head and neck. Bring a list of medications and any removable dental appliances.

You will usually be asked to remove eyeglasses, earrings, necklaces, facial piercings and other metal objects that could interfere with the image in the scanned region. Some dental appliances must be removed; others may stay—follow the instructions for your case. Wear clothing without large metal zippers or buttons near the head and neck when possible.

You generally do not need to stop eating or take a special “prep drink” for a standard dental CBCT the way some medical tests require. If your dentist gives different instructions for a combined appointment, follow those instead.

If anxiety is high, ask in advance whether you can see the room, how long you must remain still and whether a support person can accompany you to the office (they may not stand in the imaging area during exposure).

Positioning and how long the scan takes

Dental CBCT units typically have you stand or sit while a rotating arm moves around your head. A chin rest, forehead support or other stabilizers may help keep your head in the correct position. Bite pegs or cotton rolls are sometimes used to separate the teeth slightly, depending on the protocol.

The team will align the field of view to the region needed for your clinical question. A smaller field of view may be used when only a limited area must be seen; a larger field may be selected when broader relationships matter. Field-of-view choices are clinical decisions tied to justification and optimization; they are not one-size-fits-all upgrades.

You will be asked to stay still and follow breathing or swallowing instructions if given. Movement can blur the volume and may lead to a retake. The rotational acquisition itself is often measured in seconds rather than minutes, but total appointment time includes setup, positioning, possible trial alignment and verification that the volume is usable.

Because equipment and protocols differ, ask the practice how long you should plan to be in the office for your specific scan. Do not rely on generic times posted on unrelated websites.

Protective shielding practices, when used, follow professional judgment for the exam type and patient factors. Ask what measures apply to your scan.

For practice information about three-dimensional imaging services, see 3D CBCT imaging.

What you may feel or hear

Most patients feel pressure from head supports rather than pain. The machine may hum, whir or click as it rotates. You might notice the arm moving in your peripheral vision. None of these sensations means the scan is “delivering a dose you can feel”; ionizing radiation is not perceptible as heat or tingling during a dental CBCT exposure.

People with a sensitive gag reflex are often more comfortable with CBCT than with multiple intraoral sensors, because nothing may need to sit on the tongue for a standard extraoral scan—though some protocols still use a bite tab. Tell the team about prior difficulty with dental X-rays.

If you feel unsteady standing, ask whether a seated protocol is available. If you cannot remain still for the rotation, tell the operator before exposure begins.

Children and adolescents require especially clear justification because they can be more sensitive to radiation and have longer expected lifetimes for delayed effects to be considered, as the FDA notes in its CBCT consumer and professional information. Parents should expect an explanation of why CBCT is preferred over alternatives for that child’s specific question.

What happens after the images are captured

After the rotation, the software reconstructs a three-dimensional volume that can be viewed in multiple planes. The dentist reviews whether the scan is diagnostically adequate. A retake is considered only if the volume does not answer the clinical need because of movement or technical factors.

Interpretation may occur during the same visit or at a follow-up, depending on complexity. Some cases are reviewed with additional planning software or, when appropriate, with a specialist. CBCT can show relationships among teeth, bone and nearby anatomical structures in three dimensions; it does not automatically diagnose every condition or guarantee a treatment outcome.

Findings should be explained in plain language: what was evaluated, what was found, how certain the interpretation is and how it affects options. Incidental findings outside the original question sometimes appear; ask how those will be handled and whether another provider needs to be involved.

CBCT images become part of your record and may be shared with specialists involved in your care when you authorize transfer. Keep copies of reports or discs/files if you will be seen in more than one office, to reduce repeat scanning.

Remember the role boundary: CBCT supports planning for selected problems. Routine cavities between teeth are still often evaluated with bitewing radiographs. Using CBCT for every checkup would conflict with justification principles emphasized by the FDA and professional dental organizations.

Questions worth asking before you leave

  1. What clinical question did this scan answer? You should hear a specific planning or diagnostic purpose.
  2. Were the images adequate, or is anything still unclear? Adequacy matters more than having a file created.
  3. How do the results change my options? Connect imaging to decisions, including monitoring when appropriate.
  4. Do I need any other radiographs? Sometimes 2D images remain useful alongside CBCT; sometimes they do not.
  5. Who else will see these images? Clarify referrals and record transfer.
  6. What should I watch for after today’s visit? CBCT itself usually has no recovery period, but related dental treatment might.

If the scan was recommended but not yet taken, you can ask the same justification questions first. Declining an unindicated scan is reasonable; declining a scan that is needed for safe surgery or complex treatment planning has different consequences that your dentist should explain.

Bring radiation questions to the conversation with clinical context. The FDA notes that dental CBCT typically delivers more radiation than conventional dental X-rays, while generally less than many medical CT exams—without requiring patients to memorize numbers. Justification and optimization remain the practical safeguards.

FAQ

Does a dental CBCT scan hurt?

No. Most people feel only positioning supports and hear the machine move. Tell the team if staying still or standing is difficult so adjustments can be considered before exposure.

How should I prepare on the day of my CBCT scan?

Share pregnancy status and recent imaging history, follow instructions about removing jewelry or appliances, and wear clothing without heavy metal near the head and neck when possible. Ask the office if any case-specific instructions apply.

Is CBCT the same as a regular dental X-ray?

No. Regular dental X-rays are typically two-dimensional images for common diagnostic tasks. CBCT produces a three-dimensional volume used for selected questions and is not a routine replacement for bitewings or periapicals.

Next step

To learn about 3D CBCT imaging at Landmark Dental Care, call 902-893-2919 and ask how a recommended scan would support your specific treatment plan at 125 Queen St in Truro.

References

This article provides general educational information and is not a diagnosis or a substitute for care from a dentist or other qualified health professional. It does not specify scanner models, fields of view used at the practice, or radiation dose values.