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Updated: Jan 3, 2026
Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Accuracy of digital and conventional dental implant impressions for fixed partial dentures: A comparative clinical
Agne Gedrimiene1, Rimas Adaskevicius2, Vygandas Rutkunas1
1Department of Prosthodontics, Institute of Odontology, Faculty of Medicine, Vilnius University, Lithuania.
Purpose:
The newest technologies for digital implant impression (DII) taking are developing rapidly and showing acceptable clinical results. However, scientific literature is lacking data from clinical studies about the accuracy of DII. The aim of this study was to compare digital and conventional dental implant impressions (CII) in a clinical environment.
Materials And Methods:
Twenty-four fixed zirconia restorations supported by 2 implants were fabricated using conventional open-tray impression technique with splinted transfers (CII group) and scan with Trios 3 IOS (3Shape) (DII group). After multiple verification procedures, master models were scanned using laboratory scanner D800 (3Shape). 3D models from conventional and digital workflow were imported to reverse engineering software and superimposed with high resolution 3D CAD models of scan bodies. Distance between center points, angulation, rotation, vertical shift, and surface mismatch of the scan bodies were measured and compared between conventional and digital impressions.
Results:
Statistically significant differences were found for: a) inter-implant distance, b) rotation, c) vertical shift, and d) surface mismatch differences, comparing DII and CII groups for mesial and dist al implant scan bodies (P≤.05).
Conclusion:
Recorded linear differences between digital and conventional impressions were of limited clinical significance with two implant-supported restorations.
