Clear aligner digital modeling

For an orthodontist creating digital models for clear aligners, I would prioritize scan accuracy, full-arch consistency, bite registration, ease of capturing interproximal areas, and compatibility with your aligner-planning workflow rather than simply choosing the scanner with the highest advertised resolution.

The best scanner also depends on whether you primarily use Invisalign, an in-house aligner system, or an outside lab, and whether you need a complete digital orthodontic workflow or just accurate STL/PLY files.

My top 3 intraoral scanners for clear aligners

• 

1. iTero Lumina

(Best for Invisalign workflow)

Best if Invisalign is your primary aligner system.

• Integrated Invisalign submission and orthodontic visualization workflows.
• Strong focus on orthodontic records and patient communication.
• Align Technology reports improved full-arch accuracy in its own bench testing, although that is manufacturer-sponsored evidence.itero.com+1

Trade-off: You may be paying for an integrated ecosystem you don't need if you primarily export scans to independent aligner software.

Official site:iTero Lumina

---

• 

2. 3Shape TRIOS 5

(Best all-around alternative)

My pick for a practice wanting a versatile, open digital workflow.

• Strong track record for full-arch digital impressions.
• STL export supports third-party orthodontic planning and model fabrication workflows, subject to software configuration and licensing.
• Good option if you use several labs or want flexibility in your digital workflow.pmc.ncbi.nlm.nih.gov+2

Trade-off: Confirm your exact aligner platform's integration and total software costs before buying.

Official site:3Shape TRIOS

---

• 

3. Medit i900

(Best for open workflows and value)

Worth evaluating if you want flexibility and in-house production options.

• Medit publishes a full-arch scanning time of approximately 36 seconds for the i900, although actual chairside time varies.support.medit.com
• Supports workflows involving digital model export and 3D printing.
• Medit Ortho Studio also supports aligner planning and, with applicable paid features, aligner ordering or file export for in-house production.support.medit.com+1

Trade-off: Verify the specific aligner software, export formats, and support arrangements you need. Fast scanning alone doesn't establish superior clinical accuracy.

Official site:Medit

How I would compare them clinically

These are workflow recommendations, not a definitive accuracy ranking. A systematic review found meaningful differences between scanner models and clinical scenarios, while a more recent umbrella review identified TRIOS 3 and Primescan among the consistently strong performers for complete-arch accuracy. That does not prove TRIOS 5 is superior to every current competitor.pmc.ncbi.nlm.nih.gov+3

What matters most when scanning for clear aligners

I would evaluate these five things during a live demo:

1. Full-arch accuracy: Pay particular attention to posterior segments and cumulative distortion across the arch.
2. Interproximal detail: Ensure tight contacts and tooth contours are captured without holes or excessive smoothing.
3. Occlusion: Test bite registration and the ease of aligning the upper and lower arches.
4. Export quality: Confirm that you can obtain the required STL or PLY files without unexpected fees, restrictions, or loss of needed data.
5. Total cost of ownership: Compare the scanner, software subscriptions, service contract, hardware, and per-case aligner fees.

A scanner produces the digital impression; the quality of the final aligner also depends on treatment planning, staging, biomechanics, and manufacturing.

My recommendation

• If you primarily prescribe Invisalign, start by demoing iTero Lumina.
• If you want flexibility across labs and third-party orthodontic software, compare TRIOS 5 closely.
• If your goal is to build an in-house aligner workflow, include Medit i900 plus Medit Ortho Studio in the evaluation.

One question that would change my recommendation: Are you planning to use the scans mainly for Invisalign, for an outside clear-aligner lab, or to design and manufacture aligners in-house?