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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

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25.06.2021 | Original Article

Influence of a bleaching agent on surface and mechanical properties of orthodontic thermoplastic retainer materials

An in vitro study

verfasst von: Neda Babanouri, Nazanin Ahmadi, Hamid Reza Pakshir, Shabnam Ajami, Raha Habibagahi

Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Ausgabe 5/2022

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Abstract

Objective

To investigate the effect of a tooth whitening agent on surface roughness, surface hardness, and force delivery properties of polyethylene terephthalate glycol (PETG) thermoplastic retainer materials of two different thicknesses.

Methods

PETG sheets (1 mm and 1.5 mm) were thermoformed over a 30 × 60 × 10 mm³ rectangular stone model. Surface hardness, surface roughness, and results of a three-point bending test were evaluated before and after treatment (5 h daily for 14 days) with a 15% carbamide peroxide home bleaching agent. Data were analyzed using an independent sample t‑test.

Results

Exposure of PETG specimens to the bleaching agent for 14 days significantly reduced surface hardness and increased surface roughness of samples of both thicknesses. The magnitude of force at different deflection points decreased significantly in the 1.5 mm thickness specimens treated with the bleaching agent, but no significant change was observed in the specimens with 1 mm thickness.

Conclusion

Use of a home bleaching agent could have adverse effects on surface roughness and hardness of PETG materials leading to reduced survival time of thermoplastic orthodontic retainers.

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Titel: Influence of a bleaching agent on surface and mechanical properties of orthodontic thermoplastic retainer materials
An in vitro study
verfasst von: Neda Babanouri
Nazanin Ahmadi
Hamid Reza Pakshir
Shabnam Ajami
Raha Habibagahi
Publikationsdatum: 25.06.2021
Verlag: Springer Medizin
Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Ausgabe 5/2022
Print ISSN: 1434-5293
Elektronische ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-021-00312-3

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Influence of a bleaching agent on surface and mechanical properties of orthodontic thermoplastic retainer materials

An in vitro study

Abstract

Objective

Methods

Results

Conclusion

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Abstract

Objective

Methods

Results

Conclusion

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