What 3D dental imaging is
A three-dimensional x-ray in dentistry is called a cone beam CT (CBCT), also known as a digital volume tomogram (DVT). An x-ray device rotates once around your head and captures individual images from many angles. A computer assembles these into a spatial model of the jaw that can then be viewed in any plane: from the front, from the side and in any cross-section you choose.
This sets the CBCT fundamentally apart from an ordinary x-ray. It is not about a sharper photo, but about an extra dimension that reveals structures lying flat on top of one another.
The difference from an ordinary 2D x-ray
An ordinary x-ray, such as a single image or a panoramic view, is two-dimensional. It projects the whole jaw onto a flat plane, so that structures which actually sit one behind the other overlap. Depth and exact spatial position can only be read from it to a limited extent.
A CBCT, by contrast, is three-dimensional. It shows:
- the height and width of the jawbone at every point, not just a flat outline,
- the exact course of the lower jaw nerve and the extent of the sinus in the upper jaw,
- the spatial relationship between roots, root canals and neighbouring teeth,
- findings that obscure one another on a flat image.
For many everyday questions, an ordinary x-ray is enough. It involves less radiation, is quickly available and is entirely sufficient in most situations. The three-dimensional scan only comes into play when the flat view is not enough.
When a 3D scan is indicated
We take a CBCT only when it answers a specific question and genuinely influences the treatment. Typical situations are:
- Implant planning. Before placing dental implants, the CBCT shows how much bone is available in height and width, and where important structures run.
- Nerve canal and sinus. In the lower jaw the distance to the nerve can be determined precisely, in the upper jaw the position of the sinus. Both are decisive for a safe procedure.
- Complex or curved root canals. When a tooth has additional or strongly curved canals, the 3D view makes them visible.
- Impacted wisdom teeth. If a wisdom tooth lies sideways or close to the nerve, the CBCT shows its exact position before removal in oral surgery.
- Unclear findings and jaw pathology. Changes in the bone, cysts or unclear structures can be assessed more reliably in three dimensions.
In all these cases the principle is the same: the scan is taken because it changes the planning, not as a matter of routine.
What a 3D scan shows that 2D cannot
The greatest benefit is the spatial assessment. On a flat image it is not possible to say with certainty whether the jawbone is wide enough at a given point for an implant. The CBCT shows that width directly. Likewise, the exact distance between a root and the nerve canal becomes measurable, rather than merely estimated.
The question of whether All-on-4 or single implants are the right solution can also be answered more soundly on a three-dimensional basis. We compare the two concepts in our article on All-on-4 versus single implants.
Radiation dose in proper context
Every x-ray involves radiation, including the CBCT. The dose of a dental 3D scan is, however, low and, depending on the device and field of view, lies in the range of a few days of natural background radiation that we are exposed to anyway.
We follow the ALARA principle: as low as reasonably achievable. In practice this means:
- We take a 3D scan only when it changes the treatment.
- We choose the smallest possible field of view that answers the question, rather than routinely imaging the whole jaw.
- Where an ordinary x-ray is sufficient, it remains the lower-dose and correct choice.
A CBCT is therefore not a standard step, but a deliberate decision.
How 3D improves safety and precision
Knowing where bone, nerves and neighbouring structures lie before a procedure allows us to work more precisely and more gently. The three-dimensional scan reduces surprises during treatment, because the situation is clear beforehand. This lowers the risk of injuring sensitive structures and makes the course more predictable for you.
For implant planning, this basis allows us to work digitally on screen: the position of each implant is set virtually before the first incision is made. From this plan a surgical guide can be produced, a custom-made template that transfers the planned position precisely into the mouth. In this way the digital plan becomes a precise procedure.
What to expect during the scan
A 3D scan is straightforward and quick. You sit or stand upright, a support keeps the head still, and the device rotates once around your head. The scan itself takes only a few seconds to around half a minute, and including preparation you are usually finished within a few minutes. You feel nothing during it, it is not a procedure and no anaesthetic is needed.
What a 3D scan costs depends on its extent, and we discuss this with you transparently in advance, before it is taken.
When an appointment makes sense
Whether a three-dimensional scan is needed in your situation can only be said after an examination. In many cases an ordinary x-ray is enough, in others the CBCT provides the necessary certainty. If you have implant planning or a surgical procedure ahead of you, or are simply unsure, book an appointment. We assess which scan makes sense and discuss the next steps with you.