Key takeaways
- A consistent scanning strategy (a set path around the arch with overlapping passes) matters as much as the scanner. Many accuracy problems on full-arch scans come from technique, moisture, and stitching errors.
- Calibrate on the manufacturer's schedule. For example, 3Shape recommends weekly calibration for TRIOS 3, and Medit's default calibration period is 14 days for the i500 to i700 family and 90 days for the i900 family.
- STL is the universal geometry format but carries no color. PLY and OBJ can carry color. Closed or proprietary formats keep you in one ecosystem unless the software can export open files.
- Subscription models differ sharply by brand, from mandatory service plans to no subscription at all. Compare multi-year cost, not the purchase price.
- Confirm that your labs, aligner company, and design or printing software accept the scanner's output before you buy.
Intraoral scanners replace impression trays and material with a handheld wand that builds a 3D model of the teeth in real time. They feed crown and bridge labs, aligner companies, chairside milling units, 3D printers, and implant planning software. This guide covers how they work, how to scan well, calibration and tip care, file formats and subscriptions, troubleshooting, and how to choose. For used-scanner transfers, subscriptions, and resale value, see intraoral scanners on the used market.
What an intraoral scanner does and how it works
The wand projects light onto the teeth and captures thousands of images per minute with one or more small cameras. Software matches each new frame to the surface already captured, a process called stitching or registration, and builds a triangulated 3D surface. Different brands use different optical methods, but the result is the same: a mesh of the teeth and soft tissue, usually with color, plus a bite registration that aligns the upper and lower arches.
Because every frame is stitched to the previous ones, small errors can accumulate over long spans. That is why full-arch accuracy depends so heavily on technique, and why short-span scans (a single crown) are generally more forgiving than full-arch scans.
Parts you should know
- Wand: the handheld scanner with cameras, light source, and often a heater to prevent fogging.
- Tip: the removable front section that enters the mouth, with a mirror or window. Reusable tips have a limited number of sterilization cycles; some systems use single-use tips.
- Computer: a cart, a laptop, or a manufacturer's all-in-one. It must meet the scanner maker's graphics and processor specifications.
- Acquisition software: captures, stitches, and processes the scan.
- Cloud portal or lab connection: sends cases to labs and partners and stores scans.
- Calibration tool: a target the wand scans to correct its optics. Not every model needs user calibration.
Which type does your practice need?
| Factor | Options | What it means for you |
|---|---|---|
| Connection | Wired (USB) or wireless | Wireless frees movement but adds batteries and charging; wired is simpler to keep running |
| Computer | Cart, laptop, or all-in-one | Carts are easy to move between rooms; laptops are cheaper but need to meet specs |
| Ecosystem | Open export, semi-open (open with fees or steps), or closed | Decides which labs, mills, and printers you can use without extra cost |
| Software cost | Mandatory subscription, optional plan, or none | Can exceed the purchase price over several years |
| Tips | Autoclavable with a cycle limit, or single-use | Ongoing cost and sterilizer compatibility |
| Extra features | Color, shade measurement, caries-detection imaging, ortho simulation | Useful if you will use them; each can add cost |
A decision guide
- General practice sending crowns to a lab: a scanner with open STL export and a direct connection to your lab. Ask the lab which scanners it receives most cleanly.
- Aligner-heavy practice: check which scanners your aligner companies accept and how cases are submitted. Some aligner programs are closely tied to particular scanners.
- Chairside milling or printing planned: pick a scanner whose design software feeds your mill or printer natively, or that exports open files your design software can import. See chairside milling and dental 3D printers.
- Multi-location group: standardize on one platform so training, tips, and lab connections are consistent.
- Low scan volume: favor lower recurring cost over premium features. A scanner that sits in a drawer still costs its subscription.
File formats: open vs. closed
| Format | What it stores | Typical use |
|---|---|---|
| STL | Surface geometry as triangles; no color | The universal exchange format for labs, design software, mills, and printers |
| PLY | Geometry plus optional color per point | Color scans for labs and software that read color |
| OBJ | Geometry plus texture, usually with a companion texture file | Color exchange for design and visualization software |
| Proprietary formats | Geometry, color, margins, and case data in a manufacturer format | Work best inside that manufacturer's ecosystem and its partners |
"Open" usually means the scanner can export STL (and often PLY or OBJ) directly, without fees. "Closed" can mean exports require a license, a portal step, or a partner lab. Ask the manufacturer exactly how you export an open file, whether it costs anything, and whether color and margin lines survive the export.
Subscriptions and service plans
Business models vary by brand and change over time. As described in our used-market guide, Align requires an iTero service plan after the first year unless an extended plan was purchased, 3Shape offers a paid TRIOS Care plan or a free TRIOS Only agreement without warranty, and Medit has marketed its i700 with no subscription fee. Ask for the multi-year cost of software, warranty, cloud storage, and any app fees, then compare scanners over the years you expect to own them.
How to use it: daily operation
These steps are generic. Follow your scanner's instructions for use (IFU) for tip reprocessing, calibration, and cleaning products.
Start of day
- Start the computer and the scanning software; let the wand warm up as the IFU describes. Warm-up reduces fogging and, for some models, is required before calibration.
- Calibrate if the software prompts you or the calibration period has passed.
- Confirm you have enough sterilized tips for the day's scans, and check each tip's window or mirror for scratches, water spots, and fingerprints.
- Confirm the lab or cloud connection works, so finished cases send without delay.
Scanning each patient
- Create or select the case in the software, with the correct patient, tooth numbers, restoration type, and lab.
- Prepare the field: retract, isolate, and dry. Saliva, blood, and pooled water cause stitching errors and holes. For preparations, manage tissue so margins are visible.
- Follow a consistent path. A common approach starts on the occlusal surface of the last molar, travels along the occlusal surfaces to the opposite side, then returns along the lingual, then the buccal, keeping the wand close to the teeth with each pass overlapping the last. Your manufacturer's training may specify a different path; use one path every time.
- Move steadily; if the software loses tracking, return to a well-captured area and let it relock before continuing.
- Scan the opposing arch, then the bite on both sides with the patient in maximum intercuspation.
- Review the model for holes, distortion, and margin clarity. Fill gaps before the patient leaves; trimming and rescanning an area is faster than a remake.
- Mark margins if your workflow requires it, add lab notes and shade, and send.
Between patients
- Remove the tip and reprocess it per the IFU. Reusable tips are typically heat-sterilized; 3Shape, for example, specifies a pre-vacuum autoclave cycle for TRIOS 3 tips. Track cycles against the tip's limit.
- Clean and disinfect the wand body and cable with the disinfectant the manufacturer lists. Do not spray into the wand or its vents.
- Return the wand to its cradle; do not leave it on the patient chair.
End of day
- Confirm all cases were sent and received.
- Disinfect the wand, cable, cradle, keyboard, and screen.
- Charge wireless wands and batteries, and shut down or restart the computer per your IT plan so updates install outside patient hours.
Pick one scanning path and train everyone on it, then spot-check full-arch scans monthly by overlaying them on a known reference model or by tracking lab remake reasons. Consistency is where most of the accuracy comes from.
Calibration and accuracy
Calibration corrects small shifts in the scanner's optics caused by temperature, handling, and time. Manufacturers set different schedules:
- 3Shape recommends calibrating TRIOS 3 once every 7 days (color calibration lapses after 30 days disable shade measurement), and describes TRIOS 4 tips as needing recalibration after a set number of scans. It also advises recalibrating after the scanner has been moved, shaken, or exposed to large temperature changes, and calibrating each spare tip before its first use.
- Medit sets a default calibration period of 14 days for the i500, i600, i700, and i700 wireless, and 90 days for the i900 family, adjustable in settings. It recommends calibrating when scan quality drops or temperature conditions change, after warming the scanner up.
- Some scanners do not require routine user calibration. Follow your model's IFU.
When calibration fails, 3Shape's troubleshooting advice points to dirty glass, a damaged mirror, an expired calibration kit, or incorrect mounting. Clean calibration targets only as the manufacturer allows; 3Shape specifies compressed air.
Maintenance schedule
| Task | Frequency | Who | Notes |
|---|---|---|---|
| Reprocess tip; disinfect wand and cable | Every patient | Assistant | Track tip cycles against the limit |
| Inspect tip windows and mirrors | Daily | Assistant | Retire scratched or hazy tips |
| Calibration | Per manufacturer schedule and after drops, moves, or temperature swings | Trained staff | Warm up first if the IFU says so |
| Check cable and strain reliefs, or battery health for wireless | Weekly | Lead assistant | Intermittent disconnects point to the cable |
| Verify lab and cloud connections and pending cases | Weekly | Office manager | Look for unsent or failed uploads |
| Scanning software and graphics driver updates | As released, after compatibility check | IT or office manager | 3Shape advises keeping Windows and graphics drivers updated and using approved PCs |
| Review remakes and scan-related lab notes | Monthly | Dentist | Tie remake reasons to technique or equipment |
| Replace calibration kit if it has an expiration | Per manufacturer | Office manager | Some kits carry dates |
| Warranty or service plan renewal review | Annually | Office manager | Know what lapses and what it will cost |
Troubleshooting
Staff can address technique, cleaning, calibration, and software basics. Opening the wand, repairing cables, or servicing optics goes to the manufacturer or an authorized service provider.
| Symptom | Likely causes | What to try | When to call a technician |
|---|---|---|---|
| Scanner keeps losing its place | Moving too fast, wand too far from teeth, saliva, featureless areas such as edentulous ridges | Slow down; return to a captured area; dry the field; add overlap | If it happens on a dry typodont |
| Fogged images | Tip not warmed, heater issue | Allow warm-up; use a fresh tip | If fogging persists with warmed tips |
| Holes or missing data at margins | Tissue, fluid, or poor angulation | Retract, dry, and rescan the area from several angles | Not usually |
| Full-arch scans do not fit well | Accumulated stitching error, inconsistent path, calibration overdue | Calibrate; use a consistent path; rescan with more overlap | If fit problems persist after calibration and retraining |
| Calibration fails | Dirty glass or mirror, damaged tip, expired kit, incorrect mounting | Clean per IFU; try another tip; check kit date and mounting | If it still fails |
| Colors look wrong or shade tool disabled | Color calibration lapsed, ambient light, dirty tip | Run color calibration; clean tip | If color calibration fails |
| Wand not detected or disconnects | Cable damage, USB port, power settings, driver | Reseat connection; try another approved port; restart | If the cable is damaged or disconnects persist |
| Software slow or crashes | Computer under spec, outdated graphics driver, other programs running | Close other programs; update drivers per the manufacturer | Call support if an approved PC still struggles |
| Lab cannot open or use the file | Format or export setting, lab not connected to your platform | Export in the format the lab requests; confirm the connection | Contact scanner support for export options |
Safety and compliance
- FDA: intraoral scanners are generally regulated as optical impression systems for CAD/CAM under 21 CFR 872.3661, Class II.
- Infection control: the tip enters the mouth and is reprocessed per the manufacturer's instructions, usually by heat sterilization. CDC's general principle for semicritical items that touch mucous membranes is heat sterilization or, at minimum, high-level disinfection; follow the IFU and track cycle limits. The wand body and cable are cleaned and disinfected between patients. See the CDC sterilization and disinfection summary and our autoclave guide.
- Sterilization monitoring: tips go through the same monitored cycles as instruments. See sterilization monitoring.
- Privacy: scans are protected health information. Cloud storage, lab portals, and partner access need business associate agreements where required and a place in your HIPAA program. See the compliance chapter.
- Chemicals: disinfectants require safety data sheets and staff training under OSHA's Hazard Communication Standard.
Buying new vs. used
New scanners come with warranty, current software, and support. Used scanners can be good value, but license transfer rules, subscriptions, and end-of-support dates decide their real worth. Our used scanner guide covers transfer policies by brand.
Scanner selection checklist
- Your labs and aligner companies accept this scanner's cases directly or via open files
- Open export (STL, and PLY or OBJ for color) available without extra fees, or the fees are known
- Written multi-year cost: purchase, subscription or service plan, cloud storage, apps, tips
- Tip type, sterilization method, and cycle limit compatible with your sterilizer
- Calibration requirements and kit cost understood
- Computer meets the manufacturer's current specifications
- Hands-on trial on a typodont and, ideally, a patient, by the people who will use it
- For used units: manufacturer transfer approved, end-of-support date known, seller account released
- Training and support available locally or remotely
Red flags: a used scanner without a manufacturer-approved transfer; a model near its end-of-support date priced like a current one; a computer below current specs; "open" export that turns out to require a paid module; subscriptions that lock out scanning if not renewed, when you did not budget for renewal.
Rough price ranges and lifespan
As rough ranges that vary by brand, bundle, region, and year: an industry price guide published in 2024, cited in our used-market guide, listed new scanners from under $10,000 for some value brands to around $34,000 to $35,000 for flagship models. Subscriptions and service plans can add substantially over time. Scanner hardware often outlasts its software support, so the useful life is usually set by the manufacturer's support calendar. See equipment lifespan by category.
Hypothetical example (illustrative numbers only): a practice sends 25 crown and bridge cases a month. If digital impressions save $12 in impression material and shipping and 8 minutes of chair time per case, and remakes fall slightly, the savings are real but modest compared with a $25,000 scanner plus a $250 monthly plan. The case for a scanner usually rests on adding aligners, chairside or in-office printing, faster turnaround, and patient experience, not impression material savings alone. Run your own numbers.
Brands and models you will see
Examples include the Align iTero Lumina and iTero Element series, 3Shape TRIOS (including TRIOS 5 and the TRIOS 6 introduced in 2025), Medit i700 and i900 families, Dentsply Sirona Primescan, DEXIS IS 3800 family, Planmeca Emerald S and the wireless Planmeca Onyx, and Straumann and Shining 3D scanners.
Related guides
Scanners are the front end of a digital workflow. Read chairside milling, dental 3D printers, and intraoral cameras, plus intraoral scanners on the used market before buying secondhand. Browse current listings on the marketplace.
Always follow the manufacturer's instructions for use (IFU) for your specific model. Repairs involving electrical, pressure vessel, radiation, or gas line work belong with a qualified technician. Infection control and radiation rules vary by state. Prices are rough ranges that vary by model, condition, region, and year. ChairsideSource is not affiliated with any manufacturer named here.