Analysis of monomer elution from bulk-fill and nanocomposites cured with different light curing units using high performance liquid chromatography


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Hurmuzlu F. , Kilic V.

Journal of Photopolymer Science and Technology, vol.33, no.1, pp.27-36, 2020 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 1
  • Publication Date: 2020
  • Doi Number: 10.2494/photopolymer.33.27
  • Title of Journal : Journal of Photopolymer Science and Technology
  • Page Numbers: pp.27-36
  • Keywords: Bulk-fill composite, Light curing units, Photopolymerization, HPLC, residual monomer, DENTAL COMPOSITES, RESIN-COMPOSITES, LEACHABLE COMPONENTS, RESIDUAL MONOMERS, SHRINKAGE STRESS, CONVERSION, POLYMERIZATION, CYTOTOXICITY, SORPTION, RELEASE

Abstract

© 2020 SPST.The aim of this study was to investigate the effect of different light curing units and light modes on the amount of residual monomers eluted from different resin-based composites. Initially, a total of 96 composite samples (N=24/group) were prepared from 3 bulk-fill composites with different characteristics and a nanohybrid composite using a mold (diameter: 5 mm, height: 4 mm). Then, each group was divided into 4 subgroups (n=6). Polymerization of the resin composites was performed using a halogen light source (Hilux 250), a 2nd generation LED device (Elipar DeepCure –S) and a 3rd generation LED device (Valo, standard and ultra modes). Samples were stored in 75% ethanol solution and residual monomers eluted in the solution were analyzed with HPLC after 1 day and 1 month. Monomer concentrations corresponding to the peak areas in chromatograms were calculated in ppm to obtain data for statistical analysis. The study data were analyzed using One Way ANOVA (p=0.05) and post-hoc Tukey tests. The type of the light-curing unit significantly affected the amount of residual monomer released in all composite groups (p<0.05). Except the Fill-Up composite groups, the least monomer elution was detected in the groups cured with Elipar DeepCure-S. Residual monomer amounts detected after 30 days were significantly increased in comparison to those eluted after 1 day in all groups. In light of these findings, it was concluded that the light curing units might have an impact on the monomer elution from different composites.