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01-11-2016 | Original Article

Effect of various light curing times on the elution of composite components

Authors: Christof Högg, Moritz Maier, Katherina Dettinger-Maier, Xiuli He, Lena Rothmund, Kai Kehe, Reinhard Hickel, Franz-Xaver Reichl

Published in: Clinical Oral Investigations | Issue 8/2016

Abstract

Objectives

Polymerization of resin-based composites (RBCs) is incomplete. The aim of the present study was to determine whether a longer curing time than recommended by the manufacturer influences the amount of released composite components of RBCs.

Materials and methods

The composites Clearfil AP-X and els extra low shrinkage were polymerized for six different curing times: 4, 10, 20, 40, 100, and 200 s. Light curing time recommended by the manufacturer for both composites is 20 s. Subsequently, samples were eluted in methanol and water for 1, 3, and 7 days and analyzed by gas chromatography/mass spectrometry (GC/MS).

Results

For Clearfil AP-X ethylene glycol dimethacrylate (EGDMA), diethylene glycol dimethacrylate (DEGDMA), triethylene glycol dimethacrylate (TEGDMA), 2-hydroxy-4-methoxybenzophenone (HMBP), camphorquinone (CQ) and 2,6-di-tert-butyl-4-methylphenol (BHT) were detected in methanol. In the aqueous eluate, only TEGDMA was detected. In els extra low shrinkage, HMBP, BHT, and CQ were detected in methanol.

Conclusion

Increasing the curing time compared to recommendation of the manufacturer reduces the release of most composite components. This could result in less exposure to human due to these substances.

Clinical relevance

Methacrylates are classified as potential allergens. An increasing number of dentists and patients show allergic reaction to methacrylates. Therefore, a reduced elution of composite components is an advantage.

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Title: Effect of various light curing times on the elution of composite components
Authors: Christof Högg
Moritz Maier
Katherina Dettinger-Maier
Xiuli He
Lena Rothmund
Kai Kehe
Reinhard Hickel
Franz-Xaver Reichl
Publication date: 01-11-2016
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 8/2016
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-015-1698-7

At a glance: The STEP trials

Springer Medicine

Effect of various light curing times on the elution of composite components

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

At a glance: The STEP trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

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