A dental Cone Beam CT (CBCT) is a specialized type of X-ray scan that creates detailed, three-dimensional images of your dental structures. Unlike standard flat dental X-rays, CBCT uses a cone-shaped X-ray beam that rotates around your head. This captures hundreds of images in a single scan and combines them into a highly detailed 3D model.
This scan is commonly ordered by dentists, orthodontists, or oral surgeons when they need to evaluate your bone density, nerve pathways, or sinuses before complex dental procedures.
Common Indications for a Dental Cone Beam CT (CBCT)
- Planning the exact placement of dental implants.
- Evaluating impacted teeth (like wisdom teeth) and their proximity to nerves.
- Assessing bone structure and density in the jaw.
- Diagnosing issues with the jaw joint (temporomandibular joint, TMJ).
- Evaluating dental tumors, cysts, or deep infections in the jawbone.
- Planning orthodontic treatments or reconstructive surgeries.
What exactly does a dental Cone Beam CT (CBCT) show?
The scan provides a three-dimensional view of teeth and bone and can show relevant nerve canals, air spaces, and sinuses within the selected field of view. CBCT has limited soft-tissue contrast, so another examination may be needed for a soft-tissue problem.
How should I prepare for a dental Cone Beam CT (CBCT)?
Fasting is not usually required unless sedation or another procedure is planned. Follow the centre's instructions and remove metal items from the head and neck when asked because they can obscure the images.
Do I need to stop taking medication?
Do not stop prescribed medication unless the clinical team tells you to. Ask in advance if sedation or another procedure is planned.
What happens when I arrive for my scan?
You will go to the scanning room and the radiographer will position your head in a specialised rest. Patient shielding practices vary; the essential protections are a justified examination, the smallest suitable field of view, and exposure settings matched to the patient and task.
How is the procedure performed?
You will stand or sit in a chair. You will be asked to bite down on a small plastic mouthpiece to align your teeth. The scan machine has a C-arm that will rotate 360 degrees around your head. You will hear a humming sound as it rotates. You must remain completely still and avoid swallowing for the duration of the scan.
How long does a dental Cone Beam CT (CBCT) take?
The actual scan takes only about 10 to 40 seconds. The entire appointment, including positioning, takes about 10 to 15 minutes.
Is there any discomfort?
The scan itself does not usually hurt, but keeping the head still or biting the positioning piece may be uncomfortable for some people.
Are there risks?
CBCT uses ionising radiation. Dose varies widely with field of view, exposure settings, scanner, and patient size, so it should not be described using one fixed comparison with dental X-rays or medical CT. The scan should use the smallest field and lowest exposure that can answer the clinical question.
Can children have this scan?
Children should have CBCT only when the expected information cannot be obtained adequately with a lower-dose examination and will change care. The field of view and exposure must be adjusted to the child's size and the clinical task.
Can I have this scan if I am pregnant?
Pregnancy Precaution
Tell your dentist and radiographer if you are pregnant or could be pregnant. Because the beam is directed at the head, fetal exposure is expected to be very low, but the examination still needs justification and optimisation. Pregnancy is not an automatic reason to delay necessary dental imaging, and shielding should not substitute for appropriate scan selection.
When will I get my results?
The images are generated immediately, but interpretation and report timing vary by provider. Ask who will interpret the scan and when the referring dentist or oral surgeon will receive the result.
What if the scan finds something?
Your dentist will use the 3D images to design your surgical or implant plan. If any unexpected issues like sinus infections or cysts are found, they will discuss them and coordinate the appropriate care.
Questions to ask your team
- Why is three-dimensional CBCT needed instead of standard dental X-rays?
- What field of view and size-specific exposure setting will be used?
- Will the scan change implant, orthodontic, or surgical planning?
Sources and further reading
Conclusion
A dental CBCT scan provides a highly detailed 3D map of your mouth, making dental surgeries safer and more predictable. To ensure a clear scan, remember to remove all metal objects from your neck and head before the scan starts.