The intraoral scanner (IOS) market has undergone unprecedented expansion since 2018: from fewer than ten commercial devices, the offering has grown to over forty active references in 2025, covering a price spectrum ranging from €3,500 to €45,000. This democratisation poses an acute selection problem for practitioners: each manufacturer claims metrological superiority for their device, but independent studies published in peer-reviewed journals show considerable disparities depending on the test protocols. This article provides a structured comparative analysis based on published data, applicable ISO standards and verifiable manufacturer specifications, aimed at an informed professional audience.
1. Normative Framework: ISO 12836 and Metrological Definitions
Any rigorous comparison of dental scanners must be based on ISO 12836:2015 — Dentistry: Digitizing devices for CAD/CAM systems for indirect dental restorations — Test methods for assessing accuracy. This standard establishes three fundamental metrics: trueness, defined as the deviation between the mean of measurements and the true reference value; precision, corresponding to the dispersion between repeated measurements under identical conditions; and accuracy, a combination of the two. The standard also distinguishes intra-scanner precision (repeatability) from inter-scanner precision (reproducibility). Since the 2024 revision, an additional protocol covers full-arch acquisitions, more representative of orthodontic clinical constraints.
A critical methodological point often ignored in commercial communications: the majority of validation studies published before 2022 used in vitro resin or plaster arches, under controlled lighting and humidity conditions, without saliva or soft tissue. Recent in vivo studies (Renne et al., Mangano et al., Nedelcu et al.) systematically show performance degradation, with error increases of 40 to 120% compared to ideal laboratory conditions.
2. Taxonomy of Optical Acquisition Technologies
Current intraoral scanners rely on five main physical acquisition principles, often combined within the same device:
| Technology | Physical Principle | Axial Resolution | Sensitivity to Reflective Surfaces | Representatives |
|---|---|---|---|---|
| Active confocal microscopy | Point illumination + confocal detection; only the focused depth contributes to the signal. High-frequency stroboscopic acquisition. | < 8–12 µm | Low to moderate (powder-free scan possible) | 3Shape TRIOS 5, Medit i700 |
| Active triangulation with structured light | Projection of fringes or patterns in structured blue/green light; pattern deformation analysed by stereophotogrammetric triangulation. | 15–30 µm | Moderate (highly polished surfaces may require opacification) | Dentsply Sirona Primescan 2, Carestream CS 3700, Shining3D Aoralscan 3 |
| Wavefront Sampling | Interferometric partial coherence analysis (close to low-resolution OCT); used for depth-of-field detection. | 20–35 µm | Low (insensitive to surface reflections) | Align Technology iTero Element 5D / 5D Plus |
| Optical Coherence Tomography (OCT) | Temporal or spectral interferometry; tissue penetration up to 1–2 mm. | < 15 µm (axial) | Very low | iTero Lumina (integrated OCT component), Dental Wings DWOS |
| Multi-camera active stereophotogrammetry | Simultaneous acquisition by multiple CMOS sensors; 3D reconstruction by feature point matching. | 20–50 µm | Moderate | Planmeca Emerald S, Carestream CS 3600+ |
3. Review of Flagship Devices by Market Segment
3.1 Premium Segment (> €25,000)
The premium segment groups devices positioned for maximum metrological performance and advanced software integration. Three players dominate: 3Shape with the TRIOS 5, Dentsply Sirona with the Primescan 2, and Align Technology with the iTero Element 5D Plus Intelliscan.
The 3Shape TRIOS 5 (launched 2023, updated 2025) uses active confocal microscopy with a 10 Mpx CMOS sensor and a broad-spectrum white LED illumination system. It integrates a thermal biosensor module for gingival temperature measurement (TRIOS Move+ protocol). The announced acquisition speed is 60 frames/second in real-time mode, with real-time volumetric reconstruction by embedded GPU. The 2.5 m cable is replaced by a wireless architecture (Wi-Fi 6E, latency < 5 ms) in the Wireless version. The scan head measures 21 × 14 mm for the TRIOS 5 version — a design point often underestimated for access in class II skeletal cases. The 3Shape Communicate Pro software offers native CAD/CAM integration with over 280 certified manufacturing partners.
The Dentsply Sirona Primescan 2 (2024) represents the sixth generation of the CEREC lineage. It uses active blue light triangulation (450 nm) with a dynamic depth of field of 20 mm, enabling scanning without repositioning in difficult access situations. The acquisition frequency is 30 fps with real-time reconstruction. Its architectural feature is native integration with the CEREC ecosystem (Primemill milling machines, Primeprint for 3D printing), creating a closed but fully verifiable workflow. STL open format output remains possible with a Connect Center subscription (approximately €1,800/year). The Primescan 2 introduces a real-time occlusal analysis feature (Dynamic Occlusion Analysis, DOA) based on an AI model trained on over 4 million occlusions.
The iTero Element 5D Plus Intelliscan (2024) distinguishes itself with its integration of a Near-Infrared Imaging (NIRI) module coupled to surface scanning. NIRI operates at 850 nm and enables detection of interproximal and subgingival caries with clinical sensitivity of 83% and specificity of 91% (Align Technology data, multicenter study 2023, n=1,240). The surface scanning technology relies on wavefront sampling, less precise than confocal but particularly robust in the presence of blood or gingival fluid. The iTero ecosystem is closed for Invisalign orthodontics (Outcome Simulator Pro integration, ClinCheck Live Update), but open via STL export for other uses.
3.2 Mid-Range Segment (€10,000 – €25,000)
This segment constitutes the most dynamic expansion zone of the market. It is dominated by Medit, Carestream Dental and Planmeca, with recent entries from Vatech and Dental Wings (Straumann Group). The Medit i700 Wireless (2022, firmware updated 2024) has redefined price-performance expectations. Its active confocal microscopy technology with structured blue light (hybrid confocal/structured light) achieves an acquisition speed of 60 fps with an announced resolution of 7 µm in repeatability precision. The wireless model (i700 Wireless) uses an integrated 3,200 mAh battery (approximately 50 full-arch scans per charge) and Wi-Fi 6 transmission. Medit Link software is free, natively open STL, with an open API enabling third-party integrations (Invisalign, SureSmile, uLab integrations available). The 17.5 × 12 mm scan head is among the most compact in the segment.
4. Published Metrological Performance Data
The following table synthesises trueness and precision data from published literature (in vitro full-arch studies, ISO 12836 protocol or equivalent). Values are expressed in µm RMS and represent ranges from multiple independent studies. In vivo conditions systematically show 40–120% lower performance.
| Device | Technology | Full-arch trueness in vitro (µm RMS) | Full-arch precision in vitro (µm RMS) | Full-arch trueness in vivo (µm RMS) | Key Reference |
|---|---|---|---|---|---|
| 3Shape TRIOS 5 | Confocal microscopy | 12–20 | 8–14 | 18–35 | Nedelcu et al. 2024 ; Renne et al. 2023 |
| 3Shape TRIOS 4 | Confocal microscopy | 14–22 | 10–16 | 22–42 | Patzelt et al. 2021 ; Mangano et al. 2022 |
| Dentsply Primescan 2 | Blue light triangulation | 10–18 | 8–12 | 16–32 | Patzelt et al. 2024 ; Ender et al. 2023 |
| Dentsply Primescan (v1) | Blue light triangulation | 12–20 | 9–14 | 18–38 | Ender et al. 2019 ; Chochlidakis et al. 2020 |
| Align iTero Element 5D Plus | Wavefront sampling | 22–35 | 16–24 | 35–62 | Renne et al. 2022 ; Lee et al. 2023 |
| Medit i700 Wireless | Confocal / structured light hybrid | 15–28 | 10–20 | 22–48 | Nedelcu & Revilla-León 2023 ; Kim et al. 2024 |
| Medit i500 | Blue structured light | 20–38 | 15–28 | 35–65 | Mangano et al. 2019 ; Ender et al. 2020 |
| Carestream CS 3700 | Blue light triangulation | 22–40 | 18–32 | 40–75 | Ender et al. 2019 ; Patzelt et al. 2020 |
| Planmeca Emerald S | Multi-LED stereophotogrammetry | 18–32 | 14–24 | 28–55 | Wonneberger et al. 2022 |
| Shining3D Aoralscan 3 | White light fringe projection | 35–65 | 25–45 | 80–160 | Camposeco-Olvera et al. 2023 |
A rarely discussed parameter is cumulative drift during long full-arch acquisitions (> 45 s). Drift is a systematic error generated by the ICP (Iterative Closest Point) registration algorithm when assembling successive acquisitions. It manifests as an arc-shaped distortion on the antero-posterior axis, measured by the distance between left and right second molars. Published values show: TRIOS 5: < 50 µm; Primescan 2: < 45 µm; iTero 5D Plus: 60–90 µm; Medit i700: 55–85 µm; CS 3700: 90–130 µm. Drift is particularly critical in orthodontics where intermolar relationships are determining factors for planning transverse and sagittal movements.
5. Price Comparison and Total Cost of Ownership
| Device | Purchase Price (€ incl. VAT, Europe 2025) | Annual Maintenance (€) | Software Subscription/yr (€) | Consumables/yr (€) | Estimated 5-yr TCO (€) |
|---|---|---|---|---|---|
| 3Shape TRIOS 5 Wireless | 28 000 – 34 000 | 1 800 – 2 400 | 1 200 – 1 800 (Communicate Pro) | 400 – 800 (sleeves) | 43 000 – 55 000 |
| Dentsply Primescan 2 | 32 000 – 42 000 | 2 200 – 3 000 | 1 800 (Connect Center, STL) | 300 – 600 | 48 000 – 63 000 |
| Align iTero Element 5D Plus | 25 000 – 32 000 | 1 500 – 2 000 | 0 (incl.) or 2 400 (NIRI module) | 300 – 600 | 36 000 – 50 000 |
| Medit i700 Wireless | 12 000 – 16 000 | 800 – 1 200 | 0 (Medit Link free) | 200 – 400 | 17 000 – 24 000 |
| Medit i900 | 16 000 – 22 000 | 1 000 – 1 500 | 0 (Medit Link free) | 200 – 400 | 22 000 – 32 000 |
| Carestream CS 3800 | 15 000 – 20 000 | 1 000 – 1 600 | 600 – 900 (CS Connect) | 200 – 400 | 22 000 – 31 000 |
| Planmeca Emerald S | 11 500 – 14 000 | 900 – 1 300 | 400 – 800 (Romexis) | 150 – 300 | 17 000 – 25 000 |
| Shining3D Aoralscan 3 | 3 500 – 5 500 | 300 – 600 | 0 | 100 – 200 | 5 500 – 9 500 |
| Launca DL-300+ | 4 800 – 6 500 | 400 – 700 | 0 | 100 – 200 | 7 500 – 12 000 |
6. Orthodontic Workflow-Specific Performance
- Full-arch precision and intermolar drift: As detailed in section 4, ICP drift on the antero-posterior axis is the main limiting factor for planning transverse and sagittal movements. Scanners with drift < 50 µm (TRIOS 5, Primescan 2) offer superior reliability for complex cases involving palatal expansions or Class II/III corrections.
- Subgingival and margin scanning: In adult interceptive orthodontics, precise scanning of gingival margins and sub-crestal zones is necessary for attachment planning and recession assessment. Confocal and wavefront sampling technologies are superior to classical triangulation systems in these zones.
- Speed and comfort for paediatric patients: Reducing operating time is critical for children and adolescents. Scanners achieving 60 fps with real-time visual feedback (TRIOS 5, Primescan 2) allow complete acquisitions in 3–4 minutes, versus 6–8 minutes for slower systems.
- Direct integration with aligner platforms: Direct digital impression submission without intermediate conversion is offered by 3Shape (to 15 compatible aligner laboratories), Medit (open API), and iTero (native Invisalign). Dentsply Sirona requires STL export via Connect Center for transmissions outside the CEREC ecosystem.
- Scanning in the presence of brackets: Scanning of a bonded arch (bands + brackets + wires) is necessary for mid-treatment retargeting or clinical monitoring. Confocal scanners (TRIOS 5) show the best performance on reflective metallic surfaces, with significantly reduced artifacts compared to standard triangulation systems.
7. Synthetic Positioning by Usage Profile
| Usage Profile | Priority Criterion | Primary Recommendation | Economic Alternative |
|---|---|---|---|
| Exclusive orthodontic practice, high volume (> 500 cases/yr) | Minimal full-arch drift, multi-platform aligner integration | 3Shape TRIOS 5 Wireless or Dentsply Primescan 2 | Medit i700 Wireless (TCO ×2 lower, slightly lower performance) |
| Mixed general + orthodontic practice | Prosthetic/ortho versatility, reasonable TCO | Medit i700 Wireless or Medit i900 | Carestream CS 3800 (if existing Carestream fleet) |
| Exclusive orthodontist — majority Invisalign workflow | Direct ClinCheck integration, NIRI diagnostics | Align iTero Element 5D Plus Intelliscan | 3Shape TRIOS 5 (also excellent Invisalign integration) |
| Practice with existing Planmeca CBCT | Automatic scanner/CBCT superposition, chairside workflow | Planmeca Emerald S | Medit i700 + Romexis plugin (partial integration) |
| Hospital structure / training centre | Reliability, technical support, published data | 3Shape TRIOS 5 or Dentsply Primescan 2 | Medit i700 (remarkable value for teaching) |
| Entry-level practice / budget < €8,000 | Financial accessibility, open STL | Planmeca Emerald S (entry-level) or Shining3D Aoralscan 3 | Launca DL-300+ (no subscription, free STL) |
Conclusion
The intraoral scanner market in 2025 offers unprecedented diversity, but the heterogeneity of metrological performance — a factor of 5 between the most and least precise systems under full-arch conditions — makes the technological choice genuinely discriminating for demanding orthodontic applications. Published data converge on two distinct performance segments: confocal microscopy and advanced active triangulation systems (TRIOS 5, Primescan 2), whose full-arch drift remains below 50 µm even in vivo; and classical structured light or wavefront sampling systems, whose in vivo performance establishes between 50 and 130 µm of drift. Between these two segments, Medit with the i700 Wireless represents exceptional value: in vitro performance comparable to premium systems, 5-year TCO twice lower, and an open software ecosystem. For intensive Invisalign workflows, the iTero 5D Plus retains the advantage of direct ClinCheck integration. The final choice must incorporate not only metrological performance, but also compatibility with the practice's existing digital ecosystem, case volume and the financial structure of the investment.
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