Which intraoral scanner should you buy?

Ignore the micron number on the brochure

Every brochure leads with an accuracy figure, and every one of those figures was measured in a laboratory on a machined metal block, not in a mouth with saliva, a tongue, and a patient who keeps closing.

The reason for the gap is worth understanding once: a scan is a chain of hundreds of small frames, and the alignment error between them compounds toward the back of the arch.

Two numbers matter more, and neither is usually printed:

• Repeat-scan precision. Scan the same arch twice and overlay the two meshes. How far apart are they? This governs whether you can track tooth movement across a course of treatment, which is the whole point of scanning in orthodontics.
• Time to a usable full arch on a real patient, retakes included. A scanner that captures in 30 seconds but needs three attempts on a crowded lower arch is slower than one that takes 60 seconds and gets it first time.

The costs that are not on the quote

A cheaper scanner that needs a new laptop and single-use sleeves can easily cost more across five years than the one that looked expensive. Add every line below to both quotes before you compare them.

A note on the computer

One of the questions above asks what you will run it on, and the answer changes which scanners are available to you at all. On Windows a discrete NVIDIA card is not optional, and both Medit and Shining 3D exclude particular cards by name. On a Mac the bar is lower, but only Medit, Shining 3D and the cloud-native Primescan 2 will run there.

The full requirements, per manufacturer, including the six ways a compliant-looking laptop turns out not to be, are in the main guide.

What paying more actually buys

The gap between a competent budget scanner and a mid-range one is usually four or five times the price. It is worth being precise about what that money buys, because it is rarely what the brochure implies.

1. 01

   Software depth, and updates that keep coming

   The big makers include a suite that keeps growing: model building, splints, smile design, scan comparison for tracking tooth movement. Budget scanners tend to ship a capture app and charge for the rest, or simply not have it. Ask which features are included and which are add-ons, and get the add-on prices in writing.

2. 02

   Independent evidence that it performs as claimed

   Established scanners have been tested by reviewers and in published studies. Many cheaper ones have never been measured by anyone outside the factory, which means their accuracy figure cannot be compared to anything. That is not proof they are bad. It is an absence of proof they are good.

3. 03

   A resale market, and a maker that will still be shipping updates

   A scanner with a large install base can be sold on, which quietly returns a large part of the price difference. One with a small install base cannot, and if its maker drops the line the software stops improving the day they decide.

Should you buy used?

Certified pre-owned dealers advertise 30 to 50 percent off list, and at those numbers a refurbished previous-generation premium scanner can beat a new entry-level one on capability for the same money. A certified pre-owned iTero Element 5D with a laptop and a year of warranty sells for under ten thousand dollars, against about thirty-four thousand new.

The risk is never the hardware. It is the licence.

Then check the physical things the listing will not mention: how many autoclave cycles the tips have already done, whether it still holds calibration, and whether the bundled laptop is old enough to be the next thing you replace.

Established certified pre-owned channels exist in the United States, Renew Digital among them. In India there is no comparable market yet, so the practical routes are a dealer trade-in against your next purchase, or an ex-demo unit. Ask your dealer directly: demo stock is rarely advertised.

How to run the demo

Insist on real patients, not a plaster model. Three cases are enough to separate any two scanners.

1. 01

   Crowded lower anteriors

   Where scanners lose the interproximal contacts, and where retakes come from. If it handles this, it handles most of your day.

2. 02

   A margin at or below the gingiva

   The hard case for any clinic doing crown work. A scanner that reads a clean margin here is a scanner your lab will thank you for.

3. 03

   An anxious child or a strong gag reflex

   Handpiece size and weight stop being a specification and become the whole experience. Scan a real one, not a model.

Settling a two-scanner decision with a measurement

Once it is down to two, stop arguing about specifications and take a measurement instead. It takes about half an hour and no salesperson can talk their way around the result.

1. Have both reps scan the same arch, on the same patient, on the same day.
2. Export both as STL. You do this yourself, on your own laptop.
3. Overlay the two meshes. Free tools do this, including MeshLab and the scanner makers' own software.
4. Look at the deviation, and look at it worst at the back of the arch.

Where the return actually shows up

Scanning is faster than alginate and patients prefer it, but the money is not in the impression. It is in what happens next: fewer remakes, no courier runs, and a treatment plan you can put on a screen while the patient is still in the chair. Case acceptance goes up when a patient sees their own arch instead of imagining it from a description.

That advantage only holds if the scans stay findable. A scan sitting in a folder on the scanner laptop is useless six months later when the patient asks what has changed. Keeping the scan and the plan attached to the patient record, where the front desk and the clinician can both reach them, is the part clinics underestimate, and it is where a practice management system such as Kythro does the work the scanner software will not.