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Int. J. Mol. Sci. 2016, 17(5), 732; doi:10.3390/ijms17050732

Degree of Conversion and BisGMA, TEGDMA, UDMA Elution from Flowable Bulk Fill Composites

1
Department of Restorative Dentistry and Periodontology, University of Pécs, 5 Dischka Gy Street, Pécs H-7621, Hungary
2
Department of General and Physical Chemistry, University of Pécs, 6 Ifjúság Street, Pécs H-7624, Hungary
3
János Szentágothai Research Center, University of Pécs, 20 Ifjúság Street, Pécs H-7624, Hungary
4
Department of Oral and Maxillofacial Surgery, University of Pécs, 5 Dischka Gy Street, Pécs H-7621, Hungary
5
Faculty of Sciences, University of Pécs, 6 Ifjúság Street, Pécs H-7621, Hungary
6
Department of Biochemistry and Medical Chemistry, University of Pécs, 12 Szigeti Street, Pécs H-7624, Hungary
*
Author to whom correspondence should be addressed.
Academic Editor: Ihtesham ur Rehman
Received: 20 March 2016 / Revised: 4 May 2016 / Accepted: 9 May 2016 / Published: 20 May 2016
(This article belongs to the Special Issue Molecular Research on Dental Materials and Biomaterials)
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Abstract

The degree of conversion (DC) and the released bisphenol A diglycidyl ether dimethacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA) and urethane dimethacrylate (UDMA) monomers of bulk-fill composites compared to that of conventional flowable ones were assessed using micro-Raman spectroscopy and high performance liquid chromatography (HPLC). Four millimeter-thick samples were prepared from SureFil SDR Flow (SDR), X-tra Base (XB), Filtek Bulk Fill (FBF) and two and four millimeter samples from Filtek Ultimate Flow (FUF). They were measured with micro-Raman spectroscopy to determine the DC% of the top and the bottom surfaces. The amount of released monomers in 75% ethanol extraction media was measured with HPLC. The differences between the top and bottom DC% were significant for each material. The mean DC values were in the following order for the bottom surfaces: SDR_4mm_20s > FUF_2mm_20s > XB_4mm_20s > FBF_4mm_20s > XB_4mm_10s > FBF_4mm_10s > FUF_4mm_20s. The highest rate in the amount of released BisGMA and TEGDMA was found from the 4 mm-thick conventional flowable FUF. Among bulk-fills, FBF showed a twenty times higher amount of eluted UDMA and twice more BisGMA; meanwhile, SDR released a significantly higher amount of TEGDMA. SDR bulk-fill showed significantly higher DC%; meanwhile XB, FBF did not reach the same level DC, as that of the 2 mm-thick conventional composite at the bottom surface. Conventional flowable composites showed a higher rate of monomer elution compared to the bulk-fills, except FBF, which showed a high amount of UDMA release. View Full-Text
Keywords: bulk-fill composite; degree of conversion; monomer elution; micro-Raman spectroscopy; HPLC bulk-fill composite; degree of conversion; monomer elution; micro-Raman spectroscopy; HPLC
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MDPI and ACS Style

Lempel, E.; Czibulya, Z.; Kovács, B.; Szalma, J.; Tóth, Á.; Kunsági-Máté, S.; Varga, Z.; Böddi, K. Degree of Conversion and BisGMA, TEGDMA, UDMA Elution from Flowable Bulk Fill Composites. Int. J. Mol. Sci. 2016, 17, 732.

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