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Accuracy of intraoral scanners when digitizing post preparations: A µ-CT based feasibility study
Sabrina Wildhagen1, Jonas Rechlin1, Gizem Kocaöz1
1Charité Universitätsmedizin Berlin, Center for Oral Health Sciences, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197, Berlin, Germany.
Journal of Dentistry
|June 23, 2026
Summary
Primescan (PR) demonstrated superior scanning accuracy and consistency compared to TRIOS 4 (TR) for post-space digitization. Scanner type and preparation depth significantly impacted accuracy, influencing the fit of dental restorations.
Area of Science:
- Dental materials science and technology
- Digital dentistry and prosthodontics
- Biomaterials and dental scanning
Background:
- Accurate digital impressions are crucial for fabricating well-fitting indirect dental restorations.
- Intraoral scanners (IOS) are increasingly used for post-space digitization in endodontically treated teeth.
- The accuracy of IOS in complex geometries like post spaces requires thorough evaluation.
Purpose of the Study:
- To compare the scanning accuracy of two intraoral scanners (Primescan and TRIOS 4) for post-space preparations.
- To evaluate the influence of preparation depth and diameter on scanner performance.
- To establish micro-computed tomography (µ-CT) as a reference standard for assessing IOS trueness and precision.
Main Methods:
- Extracted human premolars underwent endodontic treatment and simulated coronal substance loss.
- Post spaces were prepared at two depths (10 mm, 12 mm) and two diameters (ISO 090, ISO 110).
- Primescan (PR) and TRIOS 4 (TR) were used for digital acquisition; µ-CT provided reference data for trueness and precision analysis.
Main Results:
- Primescan (PR) exhibited significantly higher trueness and precision than TRIOS 4 (TR) (p<0.001).
- Both trueness and precision were significantly affected by preparation depth, with performance decreasing at greater depths.
- Preparation diameter had a significant effect on precision (p=0.041) but not trueness; a strong positive correlation between trueness and precision was found (r=0.838).
Conclusions:
- Intraoral scanner performance in post-space digitization is dependent on the scanner system and preparation depth.
- Primescan demonstrated superior and more consistent accuracy compared to TRIOS 4, especially in deeper preparations.
- Scanner choice and preparation geometry are critical factors to consider in digital workflows for predictable restoration fit.
