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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

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18.02.2019 | Original Article

Potential impact of lingual retainers on oral health: comparison between conventional twistflex retainers and CAD/CAM fabricated nitinol retainers

A clinical in vitro and in vivo investigation

verfasst von: Dr. med. dent. I. Knaup, Y. Wagner, J. Wego, U. Fritz, A. Jäger, M. Wolf

Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Ausgabe 2/2019

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Abstract

Purpose

To evaluate the impact of a novel computer-fabricated lingual nitinol retainer compared to a conventional lingual flexible spiral wire twistflex retainer on oral health.

Methods

The study was based on a retrospective controlled clinical study with pilot character, an in vitro investigation of material-dependent biofilm formation and an analysis of biofilm formation after intraoral incubation. Sixty-one patients with completed fixed orthodontic treatment and retention phase for at least 6 months with twistflex retainers (group 1, n = 31) or computer-aided design/computer-aided manufacturing (CAD/CAM) nitinol retainers (group 2, n = 30) were included and examined regarding plaque index (PI), gingival index (GI), probing depths, bleeding on probing (BOP) and marginal recessions (MR). Material-dependent biofilm formation of twistflex, untreated nitinol and electropolished nitinol wire samples were assessed (1) in vitro: using optical density (OD) measurement of 10 samples of each and (2) in vivo: using histomorphometric analysis of 18 samples of each.

Results

Patients treated with nitinol retainers had significant better oral health indices (PI₁ = 1.29 ± 0.06, PI₂ = 0.94 ± 0.06; GI₁ = 0.71 ± 0.05, GI₂ = 0.56 ± 0.04; BOP₁ = 0.11 ± 0.01, BOP₂ = 0.08 ± 0.01; PD₁ = 1.79 ± 0.03 mm, PD₂ = 1.59 ± 0.04 mm) except for MR (0.08 ± 0.03 mm versus 0.08 ± 0.02 mm) compared to twistflex retainers. After 24 h intraoral incubation nitinol retainers demonstrated significant less biofilm formation compared to twistflex retainers. In the in vitro investigation the temporary significant differences between the groups were compensated in the end.

Conclusions

Based on the results it can be assumed that nitinol-made CAD/CAM developed lingual retainers have a positive effect on oral health.

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Titel: Potential impact of lingual retainers on oral health: comparison between conventional twistflex retainers and CAD/CAM fabricated nitinol retainers
A clinical in vitro and in vivo investigation
verfasst von: Dr. med. dent. I. Knaup
Y. Wagner
J. Wego
U. Fritz
A. Jäger
M. Wolf
Publikationsdatum: 18.02.2019
Verlag: Springer Medizin
Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Ausgabe 2/2019
Print ISSN: 1434-5293
Elektronische ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-019-00169-7

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Potential impact of lingual retainers on oral health: comparison between conventional twistflex retainers and CAD/CAM fabricated nitinol retainers

A clinical in vitro and in vivo investigation

Abstract

Purpose

Methods

Results

Conclusions

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Abstract

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Conclusions

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