3D Face Scan With CBCT: What It Is, Who Needs It and How It Helps Treatment Planning
A 3D face scan is a radiation-free optical capture of the shape, surface and colour of your face. A CBCT captures the bone and teeth beneath it using X-rays. When the two are merged in planning software, the Dentist or surgeon can see how bone, teeth and facial appearance relate, which helps in orthodontic, jaw surgery, implant and smile design planning.
Most Dental imaging answers questions about teeth and bone. Patients, however, judge the result by their face: the smile, the profile, the balance between lips and chin. A 3D face scan is a way of putting the face into the plan from the start.
This guide explains what a 3D face scan is, what it captures and does not, how it combines with a CBCT, who is likely to benefit, what the patient actually does, and what it cannot do. It is written for patients and for Dentists who are considering whether it belongs in a particular case.
What a 3D Face Scan Captures
A 3D face scan records the outer surface of the face as a three-dimensional model. Depending on the system, it uses patterns of projected light, laser lines or a set of synchronised cameras. The capture can take anywhere from a fraction of a second to a few seconds. The result is a model that can be rotated, measured and viewed from any angle, usually with the natural skin colour and texture included.
What it records:
The shape of the face: forehead, nose, cheeks, lips, chin and jawline.
The surface colour and texture, which helps in identifying landmarks.
Facial symmetry, including small differences between the left and right sides.
The position and shape of the lips, and how they sit relative to the teeth in a smile.
What it does not record: anything under the skin. A face scan cannot show bone, teeth, roots, nerves or the airway. That is the part that needs X-ray imaging.
It also involves no ionising radiation. The capture is optical, in the same way a photograph is, which is one reason it can be repeated during treatment to track change.
What a CBCT Adds
A CBCT scan uses a cone-shaped X-ray beam and builds a three-dimensional model of the teeth, jaws and the bones of the face. It shows tooth roots, the thickness and shape of the jawbone, the position of buried teeth, the nerve canals and the sinuses. The complete guide to CBCT scanning in dentistry describes how it works and what it is used for.
A CBCT can also show the outer surface of the skin, as a by-product, if the field of view is large enough. That surface is plain grey, however. It has no colour or texture, it may be cut off at the edges, and it is often less precise than a dedicated face scan. The face scan fills that gap.
How the Two Are Combined
The face scan and the CBCT are taken separately, and often on different machines. Planning software then aligns them, a step called registration. The software matches the skin surface from the face scan to the skin surface in the CBCT, using shared landmarks such as the nose, forehead and cheeks, and then overlays the two models. The result is a single virtual model of the patient: the colour face on the outside, the teeth and bone beneath.
Teeth can be added as well. A digital scan of the teeth, taken with an intraoral scanner, can be merged into the same model to show the surface of the teeth accurately. Together, the face, the teeth and the bone form what is often called a virtual patient.
The quality of the merge depends on three things: how still and relaxed the patient was in each scan, how much surface the two scans share, and the software used. A poorly registered model looks convincing and is subtly wrong, which is why the clinician should check the alignment before relying on it.
A Comparison at a Glance
| 3D Face Scan | CBCT | Combined Model | |
|---|---|---|---|
| What it captures | Skin surface, shape, colour | Bone, teeth, roots, nerves, sinuses | Face, teeth and bone together |
| Radiation | None | Yes, depends on the field of view | Same as the CBCT alone |
| Time to capture | A fraction of a second to a few seconds | About 8 to 40 seconds | The sum of the two |
| Shows bone or roots | No | Yes | Yes |
| Shows colour and texture | Yes | No | Yes |
| Best used for | Facial symmetry, profile, smile | Bone, teeth and anatomy | Planning treatment that changes both |
Who Might Benefit
A 3D face scan is not needed for every patient. It earns its place when the plan changes the face, or when the face limits what the plan can do.
Orthodontics
In cases with a significant jaw discrepancy, facial asymmetry, a marked lip or profile concern or a plan involving jaw surgery, the face scan documents the starting point and helps the Orthodontist explain what tooth movement can and cannot change in the face. It also gives a baseline to compare with at the end of treatment. For routine alignment of mild crowding, it is usually unnecessary. The science behind cephalometric analysis explains how profile is assessed in two dimensions, and the face scan extends that into three.
Jaw surgery planning
For patients planning orthognathic surgery, the face scan, the CBCT and the Dental models are combined to plan how the jaws will move and to simulate the likely change in the face. The simulation is a prediction, and soft tissue does not always respond exactly as the software shows, so it is best treated as an aid to discussion and not a promise.
Smile design and prosthodontics
When the aim is a change in the smile, such as new front teeth, veneers or a full-arch restoration, the face scan shows where the facial midline, the lip line and the smile line sit. The design of the teeth can then be built to suit the face and not only the mouth.
Implants in the visible zone
For implants in the front of the mouth, or full-arch cases where the lip support will change, a face-driven plan considers how the final teeth will sit in relation to the lips and face. The CBCT provides the bone information and the face scan provides the aesthetic information.
Facial trauma, reconstruction and craniofacial care
In reconstruction after injury or surgery, and in craniofacial conditions, the face scan documents the facial form and tracks change over time. Because it involves no radiation, it can be repeated as often as is useful.
Tracking change
A face scan can record swelling after surgery, the effect of an orthodontic or surgical change or growth in a young patient, and each scan can be compared with the last.
Who Probably Does Not Need One
A patient with a simple restorative or routine orthodontic case, no facial concern and no plan to change the face generally gains little from a face scan. The same is true of a patient whose treatment depends only on the tooth and bone, such as a single implant in the back of the mouth. In those cases the CBCT, if needed at all, answers the question. A fair test is to ask the clinician: "What will this change in my plan?"
What the Patient Does
A face scan is quick, comfortable and involves no contact beyond, in some systems, a head support. The steps are usually:
Preparation. Remove glasses, pull hair back from the face and ears, and remove jewelry from the face and neck. Facial hair, heavy make-up and very shiny skin can affect some systems, so follow any instructions given when you book.
Positioning. You sit or stand in front of the scanner, looking straight ahead, with the head in a natural, level position.
Expression. You hold a neutral, relaxed expression with the lips resting, and sometimes a second scan is taken while smiling. You may be asked to bite in a particular way.
Capture. The scan itself takes a fraction of a second to a few seconds. You may be asked to close your eyes.
Review. The operator checks the capture and may repeat it if you moved or the expression was not neutral.
A CBCT, if needed, takes under a minute, and the two can be done in the same visit if the equipment is in the same place. They can also be done separately.
How the Dentist Uses the Combined Model
To assess facial symmetry and proportion alongside the bone and tooth positions.
To plan tooth movement, implant positions or a jaw surgery in relation to the face.
To design a smile that suits the face, and to check it before treatment starts.
To explain the plan to the patient with a model they can see and turn.
To keep a precise record that allows comparison later.
For patients, the practical benefit is often in the conversation. Seeing the plan on a model of your own face makes it easier to ask questions and to understand what will and will not change.
How Accurate Is a 3D Face Scan?
Clinical-grade systems are typically accurate to about a millimeter or better under good conditions. That is good enough for most planning, but it is not perfect, and the real limits come from the patient and the process:
Expression and movement. A smile, a clenched jaw or a head tilt changes the shape of the face.
Hair and beards. They hide the skin and the jawline.
Shiny or very dark surfaces can confuse some optical systems.
Registration. The merge with the CBCT is only as good as the overlap between the scans.
Prediction. Any simulation of the post-treatment face is an approximation.
Phone-based face scanning apps exist and are improving, but they are generally not designed or validated for treatment planning. A clinical system with a defined accuracy is the safer choice when decisions depend on the result.
Radiation and Safety
The face scan adds no radiation. Any radiation in the combined process comes from the CBCT, and the amount depends on the field of view. Typical effective doses reported in Dental dosimetry run from about 20 to 100 microsieverts for a small volume and 100 to 500 or more for a large one, compared with roughly 6 to 7 microsieverts a day from natural background radiation. The facts, myths and dosimetry of Dental radiation explains how those numbers are measured.
One practical advantage of an external face scan is that it can supply the facial surface without the CBCT having to include the whole face. In some cases that allows a smaller, lower-dose field of view, though the scans still need enough overlap to register. Whether a CBCT is needed at all should still be decided on its own merits. A comparison of OPG and CBCT explains how the different images compare.
For children and teenagers, who are more sensitive to radiation, the same principle applies as with any X-ray: the scan should answer a specific question, and the smallest suitable field should be used. A face scan on its own can be repeated freely, because it uses no radiation.
Questions to Ask Before You Agree
What will the face scan change in my treatment plan?
Is a CBCT needed as well, and what question will it answer?
Which field of view will be used, and why?
Will the face scan and the CBCT be merged, and who checks the alignment?
What will I receive: the files, a report, images of the model?
Is the face scan a one-off or will it be repeated to track progress?
What is the total cost, and what does it include: the face scan, the CBCT, the registration and a qualified report?
Cost varies with the centre and with what is included, so ask for a clear itemized quote. Why the same scan can cost very different amounts explains how to compare quotes for Dental imaging in general.
Preparing for Treatment Planning With a Virtual Patient
If a combined model is being built, a little preparation by the patient and the Dentist improves the result. The patient should arrive with the face clean of heavy make-up, hair tied back and facial hair trimmed if possible. The Dentist should note the bite and the position of the jaw that matter for the plan, so that the face scan is taken in the same position as the CBCT. If the two scans are taken with the jaw in different positions, the merge will look right and mislead.
It also helps to decide, before the scans, which questions the model needs to answer. A model built for a smile design is different from one built for jaw surgery, and the views, expressions and fields of view chosen should follow from that. Planning the scans around the question avoids a second visit.
Limits and Honest Expectations
A combined model is a planning tool, not a prediction machine. Soft tissue moves differently in different people, and swelling, healing and growth all change the face after treatment. A smile design shown on screen is a proposal to be tested in the mouth, usually with a trial mock-up, before it becomes permanent.
Equally, a face scan does not diagnose anything. It documents shape. Decisions about bone, roots, nerves and disease still rest on the CBCT, the clinical examination and the report of a qualified reader. Patients should be wary of any presentation that treats a good-looking simulation as a promise of the outcome.
Finally, the cost of adding a face scan should be weighed against what it adds. For some cases it clarifies the plan and improves the conversation. For others it adds expense without changing a decision, and a clinician should be able to say plainly which kind of case yours is.
Where to Find It
3D face scanning is available at a limited number of Dental imaging centres, and at some larger clinics with their own equipment. The 3D face scan service page explains how the scan is offered and arranged.
Frequently Asked Questions
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An optical capture of the surface of the face as a three-dimensional model, with colour and texture. It involves no X-rays and records the shape of the face, not the bone or teeth beneath it.
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No. It uses light or cameras, in the same way as a photograph. If a CBCT is taken as well, that scan carries its own dose.
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No. A face scan shows only the skin surface. A CBCT shows bone, teeth and nerves. They answer different questions, and many plans use both.
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The capture takes a fraction of a second to a few seconds. With positioning and checking, the visit is usually only a few minutes.
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Planning software aligns the two models using the shared surface of the face and then overlays them. The clinician checks the alignment before relying on the combined model.
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Patients whose treatment will change the face or is limited by it: significant jaw discrepancy or asymmetry, planned jaw surgery, major smile or aesthetic-zone work, facial reconstruction and craniofacial conditions.
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Generally not. Phone-based scans are improving, but they are not designed or validated for planning treatment, whereas clinical systems have defined accuracy.
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It can help simulate a likely result, but soft tissue does not always respond exactly as the software predicts. Treat a simulation as a guide for discussion and not a guarantee.
