What is CBCT?
CBCT stands for Cone Beam Computed Tomography. It uses a cone-shaped X-ray beam to create three-dimensional images of the teeth, jaws and surrounding bone. This type of imaging uses ionizing radiation.
How CBCT differs from a panoramic X-ray and an intraoral optical scan
A Panoramic Dental X-ray (OPG) shows a wide area in a single two-dimensional image. CBCT provides three-dimensional slices of a selected region, so it does not replace a panoramic film in every case.
An intraoral optical scan (digital impression) records tooth and soft-tissue surfaces with light. It does not use ionizing X-rays and does not show internal bone anatomy the way CBCT can. The three methods answer different questions; none automatically replaces another.
When might CBCT be requested?
The decision is based on examination findings, history and the clinical question—not on routine screening or convenience. When two-dimensional films already provide enough information, additional CBCT may not be recommended.
For example, a dentist may request CBCT when planning implants—to assess bone height and width and nearby anatomy in three dimensions—or to clarify how an impacted tooth relates to neighbouring structures. Whether it is needed is decided case by case.
What happens during the scan and how to prepare
The procedure is non-invasive. You will be asked to stay still; removing metal jewellery, piercings or removable dentures may be requested for image quality. Detailed preparation follows the instructions of the scanner and imaging centre. Ask the imaging centre about preparation and how results will be shared.
Radiation and safety
CBCT generally involves more radiation than conventional dental X-rays. The dose depends on the device, the area imaged and the exposure settings. Your dentist chooses the imaging method that can provide the information needed. Prior films or scans are reviewed to help avoid unnecessary repeats. The information the scan may provide is weighed together with radiation risk; when appropriate, another imaging method may be preferred.
If you are pregnant or may be pregnant, tell your dentist before the scan. For children and in pregnancy, whether imaging is needed is assessed individually.
How results are used
Images support treatment planning; they do not replace Dental Examination and Consultation or clinical interpretation. Your dentist reviews the imaging findings together with the examination and explains how they affect the treatment plan.
For an assessment or appointment request, use the Contact page. Department overview: Oral and Maxillofacial Radiology.