J Adv Prosthodont.  2019 Oct;11(5):271-279. 10.4047/jap.2019.11.5.271.

Accuracy of digital and conventional dental implant impressions for fixed partial dentures: A comparative clinical study

Affiliations
  • 1Department of Prosthodontics, Institute of Odontology, Faculty of Medicine, Vilnius University, Lithuania. geciauskaite.agne@gmail.com
  • 2Department of Electrical Power Systems, Faculty of Electrical and Electronics Engineering, Kaunas University of Technology, Lithuania.

Abstract

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.

Keyword

Digital impression; Dental implant; Impression accuracy

MeSH Terms

Clinical Study*
Dental Implants*
Denture, Partial, Fixed*
Jupiter
Splints
Dental Implants

Figure

  • Fig. 1 Scanning sequence with IOS: (A) upper jaw, (B) lower jaw.

  • Fig. 2 (A) 3D computer models obtained using different scanning techniques. For coarse alignment, three corresponding points on the surface of each model are marked. (B) The center point of the scan body is at the intersection between its axis and top plane. (C) The Euclidean distance between the center points of two scan bodies. (D) The angulation of scan bodies. (E) Detecting the edge of the scan body. (F) The rotation of one scan body in relation to the other one. (G) The vertical shift of the scan body.

  • Fig. 3 Differences of distance between scan body measurements of conventional and digital impressions (mean 70.8 ± 59 µm). The dotted line represents the tentative clinical threshold of 100 µm misfit, and the dashed line represents the mean of the differences measured.

  • Fig. 4 Differences in angulation between the measurements of digital and conventional impressions (mean 0.37 ± 0.3°). The dotted line represents the tentative clinical threshold of angular misfit 0.4°, and the dashed line represent s the mean of differences measured.

  • Fig. 5 Differences in rotation between the measurements of digital and conventional impressions (mean 2.0 ± 1.37°). The dashed line represents the tentative clinical threshold of angular misfit 0.4°, and the dotted line represent s the mean of the differences measured.

  • Fig. 6 Differences in vertical shift between digital and conventional groups (mean 82.2 ± 61.7 µm). The dotted line represents the tentative clinical threshold of 100 µm misfit, and the dashed line represents the mean of the differences measured.


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