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First identify which data are missing: extra-oral photogrammetry records implant positions, while an intraoral scan captures soft tissue and mucosal contours. If the needed surface or coded scan-body features were never captured, rescan them; if the data exist but do not line up, use the scanner’s documented alignment workflow. Mesh repair can close eligible holes, but it cannot prove that clinical anatomy was captured.
Identify what is missing before changing the mesh
Separate the problem into implant-position data, soft-tissue data, and registration between datasets. In the workflow described by the ITI guide, extra-oral photogrammetry (EPG) records implant positions; a separate intraoral scan (IOS) is needed for tissue morphology. A missing gingival surface in the combined result may therefore be absent from the IOS rather than lost by photogrammetry.
- Implant coordinates are missing or suspect: inspect scan-body capture, conversion, library matching, and EPG acquisition.
- Soft tissue is missing: inspect the IOS and rescan the region if its anatomy was not captured.
- Both datasets exist but do not correspond: check each registration layer, rather than moving the final combined mesh by eye.
If the defect appears after scan-body conversion, do not assume a universal cause. SHINING 3D’s support index lists a “Missing Part of Scan Bodies after Convertion” FAQ, but the index does not provide its answer. Check the exact scanner and software version, library, and workflow instructions.
Check compatibility, calibration, seating, and condition
Before repairing geometry, verify that the scan bodies, implant library, software, and scanner belong to a compatible workflow. Follow the manufacturer’s calibration protocol, ensure each body is seated and secured as instructed, and inspect whether its coded features were captured clearly.
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Extra-oral photogrammetry
For the EPG systems discussed in the ITI guide, compatible photogrammetry scan bodies are placed on all implants and hand-tightened; the device is calibrated with its calibration device according to the manufacturer’s protocol. That guide gives a working distance of 25 to 30 cm for its iCAM4D or PIC workflow. This is specific to those systems, not a general setting for dental photogrammetry.
SHINING 3D intraoral workflow
SHINING 3D documentation describes coded scan bodies for locating implant position and direction, and cap scan bodies for soft-tissue capture in immediate cases. The documented workflow requires an Aoralscan Elite series device. It recommends replacing coded or cap scan bodies within 300 uses; this is manufacturer-specific guidance, not a universal service life.
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For the cap-scan-body workflow, confirm the part type and its kit correspondence; do not mix types. Check that the surfaces and screw structures are clean and undamaged. Blood or saliva over coded features can prevent recognition, and unstable postoperative tissue or unclear feature points can also interfere with automatic alignment.
Recapture missing or obscured geometry
If a coded feature or required anatomical surface was never captured, return to acquisition. Cleanup tools cannot reconstruct clinical information that is absent from the scan.
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Capture coded scan bodies deliberately
SHINING 3D’s coded-body instructions say to use the appropriate body length at the corresponding implant, orient the coded-body ends toward the palatal or lingual side, and follow the on-screen path to scan the whole structure and then each rod in detail. If adjacent implants prevent scanning all bodies at once, the instructions describe capturing them in groups. The guide suggests approximately 10 N·cm tightening for that specific product workflow; use the current instructions for the device and do not apply that torque to other scan bodies.
- Check in the software that the entire coded geometry is visible and not obscured.
- Capture the tissue surfaces needed for the case in the IOS as well as the implant-position data.
- Review for overlapping duplicate layers, gaps, or stitching problems before proceeding.
Exact scan paths and capture thresholds vary by scanner and case. For 3Shape Unite, the vendor recommends trimming excess tissue and artifacts, confirming that teeth and restoration areas are fully captured, checking for large gaps, holes, double images, and stitching issues, trimming overlapping areas, and rescanning missing data. Its 2023 guidance recommends no more than 2,000–2,500 3D images per single full-jaw scan in that workflow to reduce post-processing failures; this is not a universal image limit.
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Use manual alignment when the corresponding data exist
Manual alignment is appropriate when both datasets contain the features needed for correspondence but automatic registration fails. Use only the scanner’s documented procedure, then inspect the resulting overlay, reslices, or other quality checks the software provides.
SHINING 3D cap scan bodies
For its cap-scan-body workflow, SHINING 3D describes manually selecting three corresponding data groups. If only two cap scan bodies are used, select the documented “only two cap scanbodies exist” option. The vendor recommends at least three for alignment while allowing a minimum of two in this workflow; these are system-specific instructions, not general clinical rules.
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SHINING 3D coded scan bodies
For coded bodies, the instructions call for scanning the connection between the coded scan body and gingiva and provide manual alignment when automatic alignment is wrong. After alignment, confirm that conversion and marking use the intended manufacturer, implant type, and subtype. The coded body should be scanned before conversion and marking.
Check every registration layer
The ITI workflow links separate datasets: intraoral scan bodies are aligned to standard library scan bodies, which are then matched to extra-oral photogrammetry scan bodies. If a full-arch prosthesis dataset is misregistered, inspect each correspondence layer in sequence. A visually plausible final overlay is not a substitute for checking the intended matches.
Clean eligible mesh defects without mistaking them for captured anatomy
Mesh cleanup is for eligible holes, borders, and isolated artifacts after the capture itself has been reviewed. 3Shape Dental System refinement describes controls for closing holes, improving scan borders, and removing scan artifacts smaller than 5 mm. Availability is limited to specified order types and imports, so check the applicable software version and order settings. The 5 mm figure is the tool’s artifact-removal threshold, not a clinical threshold for discarding anatomy.
A hole-closing operation can make a mesh look continuous while the filled region remains interpolated rather than captured. For a fit-critical implant prosthesis, follow the clinical team’s verification protocol and obtain a new capture when key anatomy or implant geometry is uncertain. The cited documentation does not establish one universal acceptance test.
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Choose the least disruptive supported correction
| Problem | Appropriate next step | Important limit |
|---|---|---|
| Required surface or coded feature was not captured, is obscured, or is damaged | Correct the setup and rescan the relevant region | Mesh filling cannot establish missing clinical anatomy. |
| Corresponding datasets exist but automatic registration failed | Use the scanner’s documented manual-alignment process and inspect its quality checks | Alignment steps are system-specific. |
| Eligible mesh hole, border, or isolated artifact remains after capture review | Use supported cleanup controls and inspect the result | Filled geometry may be interpolated, not captured anatomy. |
| Implant positions and tissue contours come from different data streams | Register the EPG and IOS datasets using the documented workflow | EPG does not replace the IOS tissue scan in the cited workflow. |
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