Intraoral 3D scanners: dental impressions without the goop

If you have ever had a dental impression taken the traditional way, you probably remember it: a tray of cold, putty-like material pressed over your teeth and held still for a few minutes while it sets. It works well, but few people enjoy it. Intraoral scanners offer a different approach, capturing the shape of your teeth digitally instead. Here is what that involves, and what it can and cannot do.

What is an intraoral scanner?

An intraoral scanner is a handheld wand, a little larger than an electric toothbrush, connected to a computer. Its tip contains a small camera and light source. As the wand is moved around your mouth, it captures a rapid series of images, and software stitches them together into a three-dimensional model of your teeth and gums.

The model builds up on screen as you watch. The dentist can rotate it, zoom in on a single tooth and check that every surface has been captured before you leave the chair.

What a scan feels like

A scan is usually quick and straightforward:

1. Your teeth are gently dried, because saliva can blur the images.
2. The wand is guided slowly over the biting surfaces, then along the cheek and tongue sides of each tooth.
3. You bite together briefly so the scanner can record how your upper and lower teeth meet.
4. The dentist reviews the model and rescans any small areas that need more detail.

There is no material to set and nothing to hold in place. The tip may feel slightly warm, and you can pause at any time to swallow or rest your jaw.

A kinder option if you gag easily

For people with a strong gag reflex, traditional impressions can be genuinely distressing. Because a scanner only touches a small area at a time and never fills the whole mouth, many people who struggle with impression trays find scanning much easier to tolerate. If you have found impressions difficult in the past, please tell us. It is a very common worry, and there are ways to make any appointment more comfortable.

How accurate is it?

Intraoral scanning is well established for many everyday uses, such as single crowns, short bridges, clear aligners and night guards. For work like this, a good digital scan is generally considered comparable to a conventional impression. Accuracy depends on careful technique and a clear view: moisture, bleeding gums or edges hidden below the gum line can make scanning harder, just as they can with putty.

One practical advantage is that problems show up straight away. A missed area can be rescanned in seconds, rather than discovering days later that an impression has torn or distorted.

From scan to crown, aligner or night guard

Once a scan is complete, it becomes the starting point of a digital workflow. The file can be sent electronically to a dental laboratory, or used with design software, to plan and make a range of restorations and appliances:

• Crowns, bridges and inlays, designed on screen to fit the prepared tooth and its neighbours.
• Clear aligners, where the scan is used to plan gradual tooth movement step by step.
• Night guards and retainers, shaped to match your teeth closely.

Scans can also be stored and compared over time, which can help show changes such as tooth wear or gum recession. And because the model is on screen, it is easier for your dentist to show you exactly what they are talking about.

The limits worth knowing

A scanner is a useful tool, not a replacement for clinical judgement. Some situations still suit a conventional impression better, for example certain complex or long-span restorations, some denture work, or cases where the edges of a preparation sit deep under the gum. A scan also records only surfaces. It does not show what is happening inside a tooth or beneath the gum, which is why X-rays and a careful examination are still needed.

The best impression technique is the one that gives an accurate result for your particular treatment, and that is a decision for you and your dentist together.

Whether a digital scan or a traditional impression is right for you depends on the treatment you need. Ask our team whether scanning would suit your situation; we're happy to talk it through at your visit.

Thinking about a crown, aligners or a night guard? The first step is a thorough check-up. Book an appointment and we will take it from there.