Scan-body design and mesh-to-CAD-library matching

English technical abstract

The study evaluated how different scan-body shapes and materials affect the match between the scan and the library file in CAD software. This match is critical in digital implant prosthodontics because the software uses the scan body not as an aesthetic object, but as reference geometry for implant position.

The results showed a significant interaction between scanner model and scan-body model. Simpler, less complex geometry with fewer sharp edges and a cylindrical shape demonstrated better congruence between the clinical mesh and library.

scanbodymeshlibrary filealignment*CAD

What the article covers and how to read it

Study objectiveThe study examined congruence between the scanned scan-body mesh and the corresponding library file using six intraoral scanners and one laboratory scanner.

Rozsah odchylekMean absolute deviation ranged approximately from 21 to 35 µm across scan bodies for the different scanners, and approximately from 19 to 46 µm across scanners for the different scan bodies.

Geometry mattersA less complex cylindrical design with fewer sharp lines showed statistically significantly greater mesh-to-library congruence.

The scanner matters tooIn the study, Primescan showed a lower mean absolute deviation than the other scanners tested across all scan bodies.

Relevance for the laboratory, dental practice and technical support

A good scan body must be clearly readable by the scanner and reliably matchable to the CAD library.
When troubleshooting library matching or seating, it is useful to distinguish whether the problem arises in the scan, library matching, scan-body design or a subsequent manufacturing step.
For technical support, this article provides a useful basis for explaining the difference between OEM/LITE and IPD/TECH workflows.

Limitations and cautious interpretation

This is an in-vitro study using specific scan-body and scanner models. It does not mean that one scan-body shape is universally correct, but it does confirm that design and scanner choice significantly influence library alignment.

Original source article

Original title: Influence of different scan body design features and intraoral scanners on the congruence between scan body meshes and library files

Download the original PDF

The source document remains available so that the original wording, methodology and results can be checked.

PDF

Related IPD pages and workflows

Glossary of abbreviations and specialist terms

An asterisk next to a term in the text refers to its explanation below.

full-arch: Full-arch means the entire dental arch, typically a scan or reconstruction of a complete edentulous arch.
alignment: Alignment is the registration or matching of a scanned 3D model to reference library geometry in CAD software.
mesh: A mesh is a 3D network of points and surfaces generated during digital scanning.

Scan-body shape, intraoral scanner and library matching