Written and dentally reviewed by Dr. Manish Pandey, BDS, Dental Surgeon
Last reviewed: 2 September 2026
Quick answer: Digital dental impressions use a small intraoral scanner to capture many images of your teeth and gums. Software joins them into a three-dimensional model that can help plan crowns, bridges, implants, retainers, clear aligners and other care. The scan does not use impression putty or ionising radiation, but it does not replace a complete dental examination or every type of conventional impression.
If your dentist has suggested digital dental impressions with an intraoral scanner, you may wonder what the wand feels like, how long the scan takes and whether the result is accurate. This guide explains the appointment in plain language, including the benefits, limitations and questions worth asking before treatment.
What is an intraoral scanner?
An intraoral scanner is a handheld optical device used to record the visible surfaces of teeth, gums and the bite. As the clinician moves the scanner tip around the mouth, a computer builds a colour or monochrome 3D model. The process is sometimes called an intraoral scan, optical impression, 3D dental scan or digital impression.
The scanner records surface shape; it is not the same as a dental X-ray or cone-beam CT scan. It does not show the inside of a tooth or the bone hidden below the gum. Your dentist may still recommend photographs, X-rays, gum measurements or other tests when they are needed for diagnosis and treatment planning.
What happens during digital dental impressions with an intraoral scanner?
- Preparation: The clinician explains the scan and may dry the teeth or move the cheek and tongue gently out of the way. Saliva, blood or reflective surfaces can make some areas harder to capture.
- Scanning the first arch: The scanner tip is moved over the biting, cheek-side and tongue-side surfaces of the upper or lower teeth. A live model appears on the screen.
- Scanning the other arch: The same sequence is repeated for the opposite jaw when both arches are required.
- Recording the bite: You close your teeth together while short scans are taken from the side. Software uses these images to relate the upper and lower models.
- Checking the model: The dentist reviews the scan for missing or unclear areas. Small sections can often be rescanned without repeating the entire procedure.
- Sending or storing the file: The approved digital model can be used for planning, sent securely to a dental laboratory or used with computer-aided design and manufacturing systems.
The exact sequence varies with the scanner, the treatment and the condition of the mouth. A scan of one prepared tooth is different from a full-arch scan for orthodontics or a complex implant restoration.
What can digital impressions be used for?
- crowns, inlays, onlays and some bridges;
- implant crowns and selected implant-supported restorations;
- clear aligners, retainers and other orthodontic appliances;
- night guards and selected removable appliances;
- digital study models and monitoring tooth position or wear;
- communication with a laboratory and discussion of treatment options.
A scan is one part of the workflow. For example, a crown still requires careful tooth preparation, bite assessment, shade selection and quality control. Read our guide to zirconia and porcelain-fused-to-metal crowns if you are comparing crown materials. Orthodontic patients can also review how digital planning may fit into clear-aligner and removable orthodontic treatment.
Is an intraoral scan more comfortable than a traditional impression?
Many patients prefer digital scanning because there is no full tray of setting material in the mouth, no impression taste and usually less concern about material reaching the back of the tongue. Clinical trials and systematic reviews generally report better patient preference or comfort with digital methods, especially for people sensitive to nausea, taste or breathing difficulty.
However, scanning is not completely sensation-free. You still need to keep your mouth open, and the scanner tip may touch the teeth or gently retract the cheek. A dry mouth, limited opening, strong gag reflex or tender tissues can make either technique more difficult. Tell the dental team if you need a pause; the scan can often be stopped and resumed.
Are digital dental impressions accurate?
Digital impressions can be clinically accurate for many single-tooth, short-span, orthodontic and selected implant uses when the scan is captured correctly. Accuracy is not determined by the scanner alone. It also depends on the length of the area being recorded, moisture control, tooth preparation, visibility of the margins, scan strategy, software, operator experience and the laboratory or manufacturing steps that follow.
Evidence is less uniform for some complete-arch, fully edentulous or complex full-arch implant situations. A 2023 systematic review found that intraoral scans appeared more accurate than extraoral scans for partial-arch situations while calling for more complete-arch clinical research. A 2026 review also noted that study quality and patient selection limit how confidently all scanners and all cases can be compared.
This is why a dentist may choose a digital scan, a conventional impression or a combination of both. If the scan does not clearly show a critical margin or soft-tissue area, repeating part of the scan or changing the technique is quality control—not a sign that every digital impression is unreliable.
When might a conventional impression still be needed?
- deep or bleeding restoration margins that cannot be seen clearly;
- mobile or extensive soft tissue that must be recorded under controlled pressure;
- some complete dentures and long-span or full-arch cases;
- limited mouth opening or anatomy that prevents the scanner tip from reaching an area;
- a clinic or laboratory workflow designed for a specific conventional material;
- when the dentist judges that another technique will produce a more dependable result.
Neither method is automatically best for every person. The important question is whether the chosen record captures the information needed to make a well-fitting, functional restoration or appliance.
Does an intraoral scanner use radiation?
No. A standard intraoral scanner uses visible or near-visible optical technology to record surface shape and does not expose you to ionising radiation. This does not mean X-rays are never needed. A digital surface model cannot reveal decay hidden between teeth, infection around a root, bone levels or other structures that may require radiographic assessment.
How should you prepare for the scan?
- Brush normally before the appointment unless your dentist gives different instructions.
- Bring current dentures, retainers, aligners or night guards if the clinic asks for them.
- Tell the team about mouth sores, jaw pain, a strong gag reflex or difficulty opening widely.
- Ask whether existing temporary restorations or loose crowns need special care.
- Expect the scan to be repeated in small areas if saliva or movement obscures the image.
If a crown has already come loose, do not delay assessment just to obtain a scan. Follow the immediate steps in our lost dental crown guide and contact a dentist.
Voice-search answers
How long does an intraoral scan take?
A straightforward scan often takes several minutes, but the time varies with how much of the mouth must be recorded, moisture control, the patient’s comfort and the complexity of treatment. Preparation and checking the model add time to the appointment.
Can I swallow during a digital dental impression?
Yes. You can usually swallow and breathe normally, and the clinician can pause when needed. Try to keep your head and jaw still while a section is being captured.
Will an intraoral scanner make me gag?
It can trigger gagging in some people, but many patients find it easier than a full impression tray. Tell the clinician before starting so the scan can be paced and the tip kept away from sensitive areas as much as possible.
Frequently asked questions
Is a digital impression painful?
The scan itself should not be painful. Mild pressure from the tip or cheek retraction is possible. Tell the clinician immediately if a tooth, ulcer, surgical area or jaw joint hurts.
Can the scan detect cavities?
A surface scan may help a dentist document visible changes, and some devices offer additional imaging features. It cannot by itself rule out decay, especially between teeth or under restorations. Diagnosis still depends on examination and any indicated tests.
Can I see my teeth on the screen?
Usually, yes. The 3D model can make it easier to discuss tooth position, wear, spacing and planned restorations. The image is an aid to communication, not a diagnosis on its own.
Is the digital file private?
A dental scan is part of your health information. Ask the clinic how it is stored, who may receive it, how long it is retained and what privacy safeguards apply in your country and the laboratory workflow.
References
- Patient-reported experiences and preferences with intraoral scanners: a systematic review.
- Patient-related outcomes of conventional impression making versus intraoral scanning: systematic review and meta-analysis.
- Comparison of digital intraoral scanners and alginate impressions: time and patient satisfaction.
- Validation of digital impression accuracy obtained using intraoral and extraoral scanners: systematic review.
- Patient perception, reliability, reproducibility and chairside time with intraoral scanners: systematic review.
Dental disclaimer: This article is for general education and cannot determine which impression technique is suitable for you. It does not replace an examination, diagnosis or personalised advice from a dentist. Treatment choices depend on your mouth, the planned restoration or appliance, available equipment and the clinician’s judgement.