Understanding dental X-rays, OPG and CBCT

Katerina Galkina · EN · 07/10/2026

Imaging should answer a question

Ask what the dentist needs to see and how it will affect care. Small intraoral images show a limited area; an OPG provides a panoramic view of teeth and jaws; CBCT creates three-dimensional data. These are different tools, not a compulsory package for every patient.

Do not choose CBCT merely because three-dimensional sounds better. Its value depends on the clinical question.

When CBCT may be considered

Guy's and St Thomas' ↗ explains that CBCT can show jaw structure inadequately demonstrated on ordinary images, for example in implant planning.

Ask whether existing images can answer the question, which area needs scanning and who provides the report. Supply previous files and dates for assessment. Old images may not always be suitable, but repeat imaging should have an explanation.

Preparation and charges

Mention possible pregnancy before imaging. Follow instructions about metal objects and removable appliances. Remaining still is important during the short CBCT acquisition.

For private scans, check referral requirements and separate consultation or reporting fees. Ask whether original files and transfer to your dentist are included. NHS imaging is selected on clinical need rather than unrestricted patient choice.

Obtain usable results

Request images in a transferable format and any associated report. For CBCT, ask about DICOM access rather than receiving only selected phone screenshots.

Agree who will explain the findings and next step. Do not diagnose decay, nerve injury or extraction need independently from an app image. A scan without clinical interpretation does not complete the assessment.