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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

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13.03.2023 | Original Article

Color changes of nanocomposites used for clear aligner attachments: an in vitro study

verfasst von: Serhat Özsoy, DDS-PhD, Hande Pamukçu, Assistant Professor, Professor Ömür Polat-Özsoy, Ece Mersan Ateş, PhD candidate

Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Sonderheft 3/2023

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Abstract

Purpose

The purpose of this study was to compare the color changes of two different nanocomposites used for two different designs of clear aligner attachments.

Methods

In all, 120 human premolars were embedded in 12 upper dental models with 10 premolars in each model. Models were scanned and attachments were digitally designed. Conventional attachments (CA) were prepared for the first six models and optimized multiplane attachments (OA) were prepared for the other six models with packable composite (PC) on the right quadrant and flowable composite (FC) on the left quadrant of each model. The models were subjected to 2000 thermal cycles at 5 °C/55 °C and then consecutively immersed in the five different staining solutions each for 48 h to simulate external discoloration. Color measurements were taken with a spectrophotometer. Color changes (∆E*ab) of the attachments before and after immersion were compared with the Commission Internationale de l’Éclairage L*a*b* (CIELAB) color space approach.

Results

When ∆E*ab values were examined, no significant difference was observed between the groups according to the attachment type (P > 0.05). After the coloration process, the flowable composite group showed less coloration than the packable composite group for both attachment designs (P < 0.05). Color difference values after the staining procedure were significantly higher in the CA-PC and OA-PC groups compared to the CA-FC and OA-FC groups (P < 0.05).

Conclusion

Color change of the packable nanocomposite was more pronounced than that of the flowable nanocomposite for both attachment designs. Therefore, clear aligner attachments created using flowable nanocomposite can be recommended, especially in the anterior region where esthetics are important for the patient.

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Titel: Color changes of nanocomposites used for clear aligner attachments: an in vitro study
verfasst von: Serhat Özsoy, DDS-PhD
Hande Pamukçu, Assistant Professor
Professor Ömür Polat-Özsoy
Ece Mersan Ateş, PhD candidate
Publikationsdatum: 13.03.2023
Verlag: Springer Medizin
Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Ausgabe Sonderheft 3/2023
Print ISSN: 1434-5293
Elektronische ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-023-00461-7

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