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Trueness of Customized Abutment Data Superimposition on Incompletely Scanned Impression: An In Vitro Study.
Yeon-Wha Baek1, Bongju Kim2, Myung-Joo Kim3
1Department of Prosthodontics, Gwanak Br, Seoul National University Dental Hospital, Seoul, Republic of Korea.
Clinical Oral Implants Research
|February 22, 2025
Summary
Superimposing digital abutment library data significantly enhances the accuracy of intraoral scans, especially for incomplete margin and proximal surface data. This method proves superior to standard CAD software hole-filling functions for improved dental restoration precision.
Area of Science:
- Digital dentistry
- Dental implantology
- CAD/CAM in prosthodontics
Background:
- Intraoral scanners (IOS) are crucial for digital dental workflows.
- Achieving high trueness with IOS data can be challenging due to incomplete scan areas, particularly along margins and proximal surfaces.
- Current methods for addressing incomplete scan data, such as CAD software's hole-filling function, may not provide optimal accuracy.
Purpose of the Study:
- To evaluate the feasibility and trueness of superimposing titanium customized abutment library data onto intraoral scans.
- To compare this superimposition technique with the standard CAD program's hole-filling function for incomplete scan areas.
- To determine the impact of superimposition on scan accuracy for full, margin-deleted, and proximal-deleted abutment scans.
Main Methods:
- A dental model with an implant was used, and abutment library data was created.
- Intraoral scans were performed 10 times using a Medit I500 scanner for fully scanned, margin-deleted, and proximal-deleted scenarios.
- Superimposition of abutment library data was performed, and the CAD program's 'Close holes' function was applied to a separate group for comparison.
- Trueness was assessed using root mean square (RMS) and point-based deviations analyzed with Geomagic Control X.
Main Results:
- Superimposition significantly improved scan trueness compared to raw intraoral scans, reducing RMS deviations.
- No significant differences in trueness were found among the different superimposition groups (fully scanned, margin-deleted, proximal-deleted).
- The CAD program's hole-filling function (PF group) resulted in greater deviations than all superimposition methods and did not enhance trueness.
Conclusions:
- Superimposing abutment library data is a feasible and effective method to improve the trueness of intraoral scans.
- This technique enhances accuracy even when dealing with incomplete scan data, such as missing margin or proximal surface information.
- The findings suggest that superimposition offers superior accuracy compared to the conventional hole-filling function in CAD software for digital dental applications.
