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In vivo accuracy and precision of full-arch implant-supported restorative workflow. Part 1: impression, models and restorations
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Oral and Maxillofacial Surgery.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction.
School of Mathematics and Maxwell Institute for Mathematical Sciences, University of Edinburgh, UK .
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Centre for Image Analysis. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Centre for Image Analysis. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction.
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(English)In: Article in journal (Refereed) Submitted
Keywords [en]
accuracy, precision, in vivo digital impression, intraoral scanner, polyether impression
National Category
Dentistry
Research subject
Oral and Maxillofacial Surgery
Identifiers
URN: urn:nbn:se:uu:diva-399686OAI: oai:DiVA.org:uu-399686DiVA, id: diva2:1378876
Available from: 2019-12-15 Created: 2019-12-15 Last updated: 2020-02-17Bibliographically approved
In thesis
1. In Vivo Accuracy and Precision in Prosthodontics
Open this publication in new window or tab >>In Vivo Accuracy and Precision in Prosthodontics
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: There has been a dramatic increase in commercially available intraoral scanners (IOS) in the last decade, offering to replace indirect digitization of models (MOD) fabricated from impressions (IMPR). IOS has benefits of less patient discomfort and a faster workflow to fabricate fixed dental prosthesis (FDP), and implant-supported prostheses (IFD). However, in vivo evidence is lacking not only for IOS, but also for MOD, FDP and IFD fit.

Aims: Paper I: to evaluate in vitro finish line distinction and accuracy in seven IOS and one MOD. To assess parameters of resolution, tessellation, topography, and color. Paper II: to evaluate a method of acquiring an in vivo reference measurement in dentate subjects and analyse accuracy and precision of IOS and MOD. Paper III: to evaluate an in vivo reference-measurement method in fully edentulous maxillae with full-arch implant treatments and to analyse accuracy of MOD and fit of existing IFD. Paper IV: to analyse precision and accuracy of IOS using different acquisition protocols compared to the reference-measurement in Paper III.

Material and Methods: Paper I: A model with a crown preparation was reference-scanned with an industrial scanner, (ATOS), scanned with seven IOS and the MOD of an IMPR was digitized. Best-fit Alignment and 3D Compare Analysis was followed by descriptive analysis. Paper II: A reference-scan was acquired with ATOS. Subjects were scanned with IOS and one MOD of an IMPR was digitized. Accuracy and precision were evaluated after Best-Fit Alignment and 3D Compare Analysis. Paper III: A reference-measurement of implant positions was acquired with ATOS. MOD from IMPR was digitized and IFD scanned. Datum and Relative Point System Alignment was followed by accuracy and precision analysis. Paper IV: Subjects in Paper III were scanned with IOS using three different protocols, followed by accuracy and precision analysis.

Results: Paper I: There were considerable differences between IOS depiction of finish line and finish line accuracy. Paper II: IOS presented varying results for impressions in up to ten units. No differences were found for MOD. Paper III: IFD was significantly less accurate than MOD. Paper IV: Differences were found between scanning protocols. Compared to Paper III, IFD was less accurate. No differences were found for MOD.

Conclusion: There are relevant differences between IOS when scanning subgingival preparations. Some IOS are better suited for long-span scans. Some IOS can be used for full-arch impressions for IFD in the maxilla, however, adequate soft-tissue management is crucial.  

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2020. p. 51
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 1625
Keywords
accuracy, precision, in vivo, digital impression, intraoral scanner, polyether impression, implant impression, framework misfit, fully edentulous
National Category
Dentistry
Research subject
Oral and Maxillofacial Surgery; Oral and Maxillofacial Surgery
Identifiers
urn:nbn:se:uu:diva-399689 (URN)978-91-513-0840-1 (ISBN)
Public defence
2020-02-14, Gunnesalen, Psykiatrins Hus, Akademiska Sjukhuset, Ingång 10, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2020-01-24 Created: 2019-12-18 Last updated: 2020-03-05

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Nedelcu, RobertOlsson, PontusNyström, IngelaThor, Andreas

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