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J Orofac Orthop. 2017 Jan;78(1):52-61. doi: 10.1007/s00056-016-0058-9. Epub 2016 Nov 17.

Therapeutic accuracy of the completely customized lingual appliance WIN : A retrospective cohort study.

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Kieferorthopädische Fachpraxis Baden-Baden, Sophienstraße 22, Im Kaiserhof, 76530, Baden-Baden, Germany.
Poliklinik für Kieferorthopädie, Universität Düsseldorf, Düsseldorf, Germany.
Kieferorthopädische Fachpraxis Düsseldorf, Düsseldorf, Germany.
Klinik für Kieferorthopädie, Medizinische Hochschule Hannover, Hanover, Germany.
Kieferorthopädische Fachpraxis Bad Essen, Bad Essen, Germany.



The aim of this retrospective cohort study was to assess the accuracy of the completely customized lingual appliance WIN (DW Lingual Systems, Bad Essen, Germany) employing a three-dimensional (3D) comparison between the setup and the final result.


The setup and final models of 20 consecutively debonded patients (40 jaws; 7 males, 13 females; mean age 15.76 ± 4.45 years) with various malocclusions of a private practice specialized in orthodontics were digitalized using a 3D scanner. The 3D models of the setup and the final model of each jaw were then digitally matched using the best fit algorithm and segmented into single teeth. After placing individual coordinate systems, the homologous teeth of the setup and the final model were matched to be able to calculate the exact deviations of all rotational and translational components. The t test for unpaired samples, Kruskal-Wallis tests, U tests, and ANOVA with Duncan post hoc test were applied statistically.


Regarding the incisors, the angle discrepancies between the setup and the final result appeared to be less than 3° (torque 2.96°; tip 2.04°; rotation 2.00°). The translations showed mean values less than 0.3 mm (mesiodistal 0.16 mm; buccolingual 0.15 mm; vertical 0.29 mm). Slightly higher values could be measured in the lateral segments regarding rotations (torque 5.18°; tip 3.10°; rotation 3.70°) as well as regarding translations (mesiodistal 0.26 mm; buccolingual 0.64 mm; vertical 0.36 mm).


Using the completely customized lingual appliance WIN, it is possible to achieve the final result predicted by the setup with a high accuracy.


3D scan; Completely customized lingual appliance; Lingual brackets; Therapeutic accuracy; Treatment planning

[Indexed for MEDLINE]
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Conflict of interest statement

Compliance with ethical guidelines Conflict of interest A. Pauls, M. Nienkemper, and R. Schwestka-Polly state that they have no competing interests. D. Wiechmann is the inventor of the bracket system WIN investigated in this study. This article does not contain any studies with human participants or animals performed by any of the authors.

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