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Effect of modulated irradiation time on the degree of conversion and the amount of elutable substances from nano-hybrid resin-based composites

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Abstract

Objectives

The aim of our study was to analyse whether the irradiation time and/or the modulation of irradiation time influence the degree of conversion (DC) and the amount of elutable substances from modern nano-hybrid resin-based composites (RBCs).

Materials and methods

The DC was recorded in real time for 5 min by means of attenuated total reflectance–Fourier transform infrared spectroscopy (n = 5) on the lower surface of 2-mm-thick samples irradiated with continuous and modulated irradiation times for 20 s and 40 s. The modulated times comprise a short polymerisation (2 s or 5 s) followed by a rest period of 1 min and an additional polymerisation to complete 20 s and 40 s of polymerisation (2 s + 18 s, 5 s + 15 s, 2 s + 38 s and 5 s + 35 s). After storing the specimens in ethanol/water for 7 days at 37 °C, the eluates were analysed by gas chromatography–mass spectrometry. Results were statistically analyzed using a one-way ANOVA analysis (α = 0.05).

Results

The effect of irradiation time on DC is similar in all three analyzed materials, showing a significant increase in DC by increasing irradiation time from 20 s to 40 s, while the DC is not influenced within one irradiation time (20 s or 40 s) by the modulation of time.

Conclusions

The type and amount of eluates are strongly dependent from the material and the irradiation protocol.

Clinical relevance

An interrupt irradiation of RBCs is clinically feasible, reducing in general the amount of elutable substances at similar DC as the corresponding continuous polymerisation.

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Conflict of interest

The authors declare that they have no conflicts of interest.

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Authors and Affiliations

  1. Department of Operative/Restorative Dentistry, Periodontology and Pedodontics, Ludwig-Maximilians-University of Munich, Goethestr. 70, 80336, Munich, Germany

    Nicoleta Ilie, Julia Obermaier & Jürgen Durner

  2. Walther-Straub-Institute of Pharmacology and Toxicology, Nussbaumstr. 26, 80336, Munich, Germany

    Jürgen Durner

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  1. Nicoleta Ilie
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  2. Julia Obermaier
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  3. Jürgen Durner
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Correspondence to Nicoleta Ilie.

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Ilie, N., Obermaier, J. & Durner, J. Effect of modulated irradiation time on the degree of conversion and the amount of elutable substances from nano-hybrid resin-based composites. Clin Oral Invest 18, 97–106 (2014). https://doi.org/10.1007/s00784-013-0934-2

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  • DOI: https://doi.org/10.1007/s00784-013-0934-2

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