When selecting an intraoral scanner, "accuracy" is the most closely watched specification - yet many clinicians misunderstand what the number actually means. In digital dentistry, accuracy consists of two distinct dimensions: trueness and precision.
Trueness vs. Precision Explained
Trueness measures how close the scanned result is to the true morphology of the object. It answers the question: "How accurately does the scanner measure?"
Precision measures the consistency of repeated scans of the same object. It answers the question: "How stable and repeatable is the scanner?"
An excellent intraoral scanner must deliver both high trueness and high precision.
Current Accuracy Levels of Mainstream Intraoral Scanners
Based on published in-vitro data and manufacturer specifications:
Single-crown accuracy for leading devices typically reaches 10–20 μm.
Full-arch accuracy generally falls in the 50–80 μm range under controlled conditions.
Specific examples include:
iTero Element series: full-arch accuracy around the 30 μm level in laboratory studies.
3Shape TRIOS 5: marketed accuracy of approximately 8–10 μm.
Medit i700: single-crown accuracy reported as less than 4.2 μm.
Shining 3D Aoralscan 3: deviation versus high-precision model scanners within 0.05 mm (50 μm).
The Aident AI-30 Intraoral Scanner is specified at ≤10 μm full-arch accuracy, placing it among the high-performance systems available for clinical use.
Important Reality Check: Lab Specs vs. Clinical Performance
Manufacturer-stated accuracy figures are almost always obtained under ideal laboratory conditions. In real clinical environments, multiple factors reduce actual performance:
Presence of saliva or blood
Patient micro-movements
Operator experience and scanning technique
Scan range (single tooth vs. full arch)
Subgingival or equigingival margin preparation
Research consistently shows that digital impression accuracy declines as the scanned arch length increases. Single-crown restorations achieve the highest accuracy, short-span fixed bridges rank next, while full-arch and edentulous scans show the lowest precision.
According to the Chinese Stomatological Association's Expert Consensus on Intraoral Digital Impression Taking, equigingival and subgingival shoulder preparations significantly reduce scanning accuracy. Distal margins on posterior teeth are particularly challenging due to limited access for the scanner tip.
Therefore, clinical accuracy depends not only on the device itself, but equally on the operator's skill and case conditions.
Practical Takeaways for Clinics
When evaluating an intraoral scanner, look beyond the headline micron number:
Confirm both trueness and precision data
Review independent clinical studies, not only manufacturer claims
Consider the scanner's depth of field, anti-fog performance, and ease of handling - these factors strongly influence real-world results
Prioritize open systems that integrate smoothly with your existing CAD/CAM and 3D-printing workflow
The Aident AI-30 combines ≤10 μm accuracy with a lightweight design (156–198 g), 20–25 mm ultra depth of field, intelligent anti-fog heating, and true-color powder-free scanning. These features help clinicians achieve more consistent results even under everyday clinical conditions.
Ready to evaluate real clinical accuracy for your practice? Visit https://www.aident3d.com/ to learn more about the AI-30 Intraoral Scanner or request a quote and demonstration today.
