What CBCT is and how it differs from a normal dental X-ray
A normal dental X-ray squashes a three-dimensional mouth into a flat picture, so things at different depths overlap. CBCT takes many images from different angles and combines them on a computer into a 3D model that can be sliced and viewed from any direction. The cone in the name refers to the shape of the beam.
You sit or stand still while the machine rotates once, which takes under a minute. Nothing is placed in the mouth except, sometimes, a bite guide. Compared with the flat OPG, CBCT adds depth: how thick the bone is, how high it is, and how close a nerve or sinus lies.
When a 3D dental X-ray is useful
CBCT is used when the answer will change the treatment plan. The commonest reasons are to plan dental implants and measure available bone, to locate a buried or impacted tooth and its relation to neighbouring roots, to study a lower wisdom tooth lying close to a nerve, to trace extra or hidden canals in a difficult root canal, and to assess some jaw lesions or injuries.
| Situation | What the 3D image adds |
|---|---|
| Dental implant planning | Bone height and width, and the position of nerves and sinus |
| Impacted or buried tooth | Exact position and contact with neighbouring roots |
| Wisdom tooth near a nerve | Closeness of the roots to the nerve canal |
| Complex root canal | Extra canals and root shape not seen on a flat picture |
| Jaw lesion or injury | Size and extent of the area |
Common reasons for a CBCT scan: general information on when dentists use 3D imaging.
Why it is not used for every patient
CBCT involves more radiation than a small intraoral X-ray, so it is justified only when the extra detail will change what the dentist does. A routine check-up, a simple filling or a plain extraction does not call for one. Our guide on the types of dental X-ray shows which picture suits which question.
Tell the dentist if you are pregnant or think you may be. Children are scanned only when there is a clear reason. A scan does not replace the examination: the dentist reads the images alongside what they see and what you tell them. Not every dental centre has CBCT, and a dentist may refer you to an imaging centre when one is needed. Guides on dental implant surgery and impacted teeth show where the scan fits in.
Common questions
What does CBCT stand for?
Cone beam computed tomography. Computed tomography means building cross-section images with a computer, and cone beam describes the shape of the X-ray beam that the machine uses.
Is a CBCT the same as a CT scan?
They work on similar principles, but a dental CBCT is designed for the teeth and jaws, covers a smaller area, and is usually done sitting or standing. A hospital CT scan covers the body and is used for different questions.
Do I need a CBCT before a dental implant?
Often it is recommended, since it shows how much bone is available and where the nerves and sinus are. The dentist decides from your case, and in some simple cases a flat X-ray is enough.
Does a CBCT hurt?
No. It is painless and quiet. You only have to stay still for the short scan while the machine turns around your head.
About this page
This page is general information, not a diagnosis or a quotation. Prices are prevailing Lucknow market ranges. Your own treatment and cost are determined after an examination. For questions about your own case, call +91 83036 12717.