A standardized x-ray of the face and skull bones taken from the lateral or frontal view, used for measurement and growth analysis.
Indication
- Orthodontic (braces) treatment planning
- Assessment of upper- and lower-jaw growth direction and discrepancies
- Pre- and post-operative planning for orthognathic (jaw) surgery
- Analysis of teeth and jaw structure together with the soft-tissue profile
- Growth monitoring in pediatric and adolescent patients
- Control imaging during the course of treatment
- Evaluation of airway morphology in sleep apnea assessment
Preparation
- No special preparation is required; fasting is not necessary
- All metal accessories around the neck and head (earrings, necklaces, glasses, hairpins) are removed
- Removable dentures and orthodontic appliances are taken out
- Pregnancy must be reported in advance
How it's performed
- The patient is positioned in front of a head-stabilizing device called a cephalostat
- The ear canals are aligned with ear rods to fix the head in a standard position
- The patient is asked to keep the lips at rest and the teeth slightly closed
- Lateral and, when needed, posterior-anterior (PA) projections are typically taken
- Each exposure lasts a few seconds; the total time is approximately 5-10 minutes
- Images are recorded digitally and measurements are performed on a computer
Post-procedure
- There are no post-procedure restrictions
- Cephalometric analysis is performed on the image to report skeletal and dental measurements
- The results are used by the orthodontist or jaw surgeon for treatment planning
- Periodic check-up films may be requested during treatment
Risks
- Contains a low dose of ionizing radiation; the risk is extremely limited
- Not recommended during pregnancy unless essential; if required, a lead apron is used
- Repeat exposure may be needed if the head moves during imaging
- Metallic objects can produce artifacts on the image
FAQ
How much radiation does a cephalometric x-ray contain?
The dose received is very low — close to the natural background exposure of just a few days. The clinical benefit-to-risk ratio is high.
Can it be taken frequently in children?
It can be repeated at specific intervals based on treatment needs. Avoiding unnecessary repetition is essential.
How does it differ from a panoramic x-ray?
A panoramic x-ray shows the teeth and surrounding tissues, while a cephalometric film provides a standardized angular view of the face and skull skeleton for measurement and analysis.
How many times is it taken during treatment?
It is usually planned at the start, mid-treatment, and at the end, depending on the orthodontist's assessment.
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