Technology
How Long Does a Cone Beam (CBCT) Scan Take in Los Gatos?
Key takeaways
- A Cone Beam (CBCT) scan involves 20 to 40 seconds of imaging, with most patients spending 10 to 15 minutes in the imaging room.
- CBCT produces a three-dimensional model of the jaws, nerves, and sinuses, while a standard dental X-ray produces only a flat image.
- Holding completely still during the rotation is the main factor that prevents a retake and keeps the appointment short.
- CBCT images hard tissue well and soft tissue poorly, so it cannot determine whether a lesion is cancerous — that requires a biopsy.
- For denture wearers, a CBCT scan reveals whether existing bone can support implants or whether grafting would be needed first.
A Cone Beam (CBCT) scan takes about 20 to 40 seconds of actual imaging, and most patients are in and out of the imaging room in 10 to 15 minutes once positioning and setup are counted. If the scan is part of a consultation visit, plan for a longer appointment overall — usually 30 to 60 minutes — because the surgeon will review the images with you afterward.
Here is the plainest way to describe it: a CBCT machine is an X-ray that rotates once around your head and builds a three-dimensional model of your jaws, teeth, sinuses, and nerves. A regular dental X-ray is a flat picture. A cone beam scan is a volume you can turn, slice, and measure.
What a CBCT scan actually is
Cone Beam Computed Tomography uses a cone-shaped X-ray beam and a digital sensor that travel together around your head in one pass. Software stitches hundreds of frames into a 3D data set. From that single scan, we can measure bone height to a fraction of a millimeter, trace the path of the inferior alveolar nerve, check sinus floors, and see the full root anatomy of an impacted tooth.
You stand or sit still with your chin on a rest and a strap or bite block holding your head steady. Nothing touches your mouth in a way that causes discomfort, and there is no tunnel or enclosed space like a medical CT. You can see the room the entire time.
Timing, step by step
| Stage | Typical time |
|---|---|
| Check-in and health history review | 5–10 minutes |
| Removing metal items (glasses, earrings, partials) | 1–2 minutes |
| Positioning in the scanner | 2–4 minutes |
| The scan rotation itself | 20–40 seconds |
| Image reconstruction on screen | 30 seconds–2 minutes |
| Surgeon review and discussion | 10–30 minutes |
Two things stretch the appointment. The first is a retake, which happens when a patient moves during the rotation — a retake adds only a few minutes, but it is the most common reason a scan runs long. The second is planning. If we are mapping implant positions or an impacted wisdom tooth, the surgeon may spend real time in the software with you watching.
Who a CBCT scan is for
We order a cone beam scan when flat images cannot answer the question in front of us. Common situations include:
- Planning dental implants, where bone volume and nerve position decide placement
- Impacted wisdom teeth sitting close to the nerve canal
- Evaluating the sinus before a sinus lift
- Facial trauma, where fracture lines need to be seen in three dimensions
- Jaw surgery planning, where the bite and skeletal relationship are measured
- Investigating a lesion, cyst, or area of bone change found on a routine X-ray
It is not for everyone. A CBCT is not a routine screening tool, and we do not take one simply because the machine is available. If a standard digital X-ray answers the clinical question, that is the right image. Patients who are pregnant should tell us before any imaging so we can defer or find another path. Very young children rarely need one. And if you cannot hold still — due to a tremor, severe claustrophobia around headrests, or a movement disorder — the scan may not produce usable images, and we will discuss alternatives.
How the process works, from first call to results
1. Before the appointment
Tell our team why you are coming and whether another dentist referred you. Ask your referring office to send any recent X-rays so we do not repeat imaging unnecessarily. Leave large earrings and necklaces at home — metal creates streaks in the data.
2. At check-in
We confirm your medical history, medications, and whether there is any chance of pregnancy. This takes a few minutes and determines whether the scan goes forward that day.
3. In the scanner
You remove glasses, removable partials, and hearing aids if asked. A technologist positions your head, sets the field of view to cover only the area we need, and steps behind the shield. The arm rotates once. That is the whole exposure.
4. Review
The images appear within a minute or two. In most cases the surgeon reviews them with you during the same visit, turning the model on screen so you can see exactly what we see. If a lesion needs a radiologist's formal read, that report usually comes back within a few business days.
Radiation and safety
A dental CBCT delivers meaningfully less radiation than a medical CT of the head, though more than a single flat dental X-ray. We limit the field of view to the smallest area that answers the question, which is the most effective way to reduce exposure. The U.S. National Library of Medicine maintains plain-language background on dental imaging if you want to read independently.
What a CBCT scan costs
A cone beam scan is typically billed as its own imaging code, separate from the consultation, and the fee depends on the field of view and whether a formal radiology report is included. Some plans cover it when it is tied to a surgical procedure, and some treat it as diagnostic imaging with its own limits. In many cases the scan fee is folded into a larger surgical treatment plan rather than charged on its own. We give you a written estimate before anything is scheduled.
Risks and tradeoffs
The honest limitations are worth naming. CBCT uses ionizing radiation, so it should be ordered for a reason, not as a default. It images hard tissue extremely well and soft tissue poorly — it will not tell you whether a lump is cancerous. It can also show incidental findings outside the area of interest, such as a sinus or airway variation, which may lead to follow-up you did not expect. Metal crowns and posts create scatter that degrades nearby detail. And a scan is only as useful as the person reading it; the value lives in the interpretation, not the machine.
Alternatives and related imaging
Digital X-rays remain the right first choice for cavities, routine checks, and many extractions. They are faster and use far less radiation. See our guide to digital X-rays.
Digital scanning captures the surface of your teeth and gums with no radiation at all. It is used for restorations and surgical guides, and it complements a CBCT rather than replacing it.
Intra-oral camera imaging shows what is visible on the surface in high detail. It is excellent for documentation and patient communication, and useless for anything beneath the gum line.
Medical CT or MRI is appropriate for extensive facial trauma or soft-tissue questions and is ordered through a hospital or imaging center.
Related questions patients ask at the same visit
What is Oral Pathology?
Oral pathology is the branch of care focused on diseases of the mouth and jaws — sores that do not heal, white or red patches, lumps, cysts, and bone lesions. A CBCT often plays a role here, because it shows whether a lesion is eroding bone and how far it extends. Diagnosis usually requires a biopsy, since imaging shows shape and density but not cell type.
What is Orthognathic Surgery?
Orthognathic surgery, also called corrective jaw surgery, repositions the upper jaw, lower jaw, or both so the teeth and facial skeleton line up properly. It is used for significant bite discrepancies, open bites, and some airway and sleep problems that braces alone cannot fix. CBCT imaging is central to planning it, because the movements are measured in millimeters and simulated before surgery.
What falls under "Other" services?
"Other" is the category for procedures that do not sit neatly under implants, extractions, or trauma — sinus lifts, biopsies, exposure of impacted teeth, pre-prosthetic bone smoothing, and management of dental emergencies. These are often short procedures with a specific purpose, and many of them begin with the same 3D scan described on this page.
Are dental implants worth it if you already wear dentures?
For many denture wearers, yes — and a CBCT is how we find out. Traditional dentures rest on gum tissue and the jawbone slowly shrinks beneath them, which is why fit changes over the years. Implants anchor into bone and slow that process, and implant-supported dentures snap onto a small number of implants instead of relying on suction or adhesive. The scan tells us whether you have enough bone where it matters, or whether grafting would be needed first. It is a real decision with real costs, and it depends on your anatomy and what bothers you most about your current dentures.
How to get started
Bring a photo ID, your insurance card, a current list of medications, and the name of your referring dentist. If you have had recent imaging elsewhere, ask that it be sent ahead. Write down your questions — the ones patients find most useful are: what will this scan change about my treatment, what is the plan if it shows something unexpected, and what does the full estimate look like in writing.
Your first appointment establishes three things: the diagnosis, the range of reasonable options, and a sedation plan if surgery follows. We will walk you through each one in plain language before you commit to anything.
Schedule a consultation at Los Gatos Oral & Facial Surgery
Frequently asked questions
How long does a Cone Beam (CBCT) scan take from start to finish?
The rotation itself lasts 20 to 40 seconds, and the time in the imaging room is usually 10 to 15 minutes including positioning. If the scan is part of a consultation, budget 30 to 60 minutes for the full visit so the surgeon can review the images with you. A retake due to movement adds only a few extra minutes.
Do I need to prepare anything before a CBCT scan?
There is no fasting or medication prep. Remove glasses, earrings, necklaces, hearing aids, and removable partial dentures before the scan, since metal creates distortion in the images. Tell us in advance if there is any chance you are pregnant.
Is a CBCT scan uncomfortable?
Most patients find it straightforward. You rest your chin on a support with a light strap or bite block holding your head steady, and the machine never touches you. The space is open, so there is no enclosed tunnel like a medical CT scanner.
When will I get my results?
The images reconstruct on screen within a minute or two, and in most cases the surgeon reviews them with you during the same visit. If a lesion or unexpected finding needs a formal radiologist report, that typically returns within a few business days. We will contact you directly if anything changes the plan.
Can a CBCT scan replace regular dental X-rays?
No. Standard digital X-rays remain the right tool for cavities, routine monitoring, and many simple extractions because they are faster and use less radiation. CBCT is reserved for questions that require three-dimensional measurement, such as implant planning or an impacted tooth near a nerve.
Will my insurance cover a CBCT scan?
Coverage varies by plan and often depends on whether the scan is tied to a surgical procedure. Some plans treat it as diagnostic imaging with annual limits, and some bundle it into a larger treatment plan. We verify your benefits and provide a written estimate before scheduling.