Effect of Opalescence® bleaching gels on the elution of dental composite components

Dent Mater. 2015 Jun;31(6):745-57. doi: 10.1016/j.dental.2015.03.016. Epub 2015 Apr 18.


Objectives: Bleaching treatments can affect on the polymer network of dental composites. This study was performed to evaluate the influence of different bleaching treatments on the elution of composite components.

Methods: The composites Tetric EvoCeram(®), CLEARFIL™ AP-X, Tetric EvoFlow(®), Filtek™ Supreme XT, Ceram X(®) mono+, Admira and Filtek™ Silorane were treated with the bleaching gels Opalescence PF 15% (PF 15%) for 5h and PF 35% (PF 35%) for 30 min and then stored in methanol and water for 24h and 7 d. The eluates were analyzed by gas chromatography/mass spectrometry (GC/MS). Unbleached specimens were used as control group.

Results: A total of 16 different elutable substances have been identified from the investigated composites after bleaching-treatment. Six of them were methacrylates: 1,10-decandioldimethacrylate (DDDMA), 1,12-dodekandioldimethacrylate (DODDMA), ethylenglycoldimethacrylate (EGDMA), 2-hydroxyethylmethacrylate (HEMA), triethylenglycoldimethacrylate (TEGDMA) and urethandimethacrylate (UDMA). Compared with the unbleached controls the composites Tetric EvoCeram(®), CLEARFIL™ AP-X and Tetric EvoFlow(®) showed a reduced elution of UDMA, TEGDMA and HEMA after bleaching-treatment. Compared with the unbleached controls an increase elution of UDMA, DMABEE, BPA and TEGDMA for the composites Filtek™ Supreme XT, Ceram X(®) mono+, Admira and Filtek™ Silorane after bleaching-treatment has been detected. The highest concentration of UDMA was 0.01 mmol/l (Tetric EvoCeram(®), water, 24h, controls), the highest concentration of TEGDMA was 0.28 mmol/l (CLEARFIL™ AP-X, water, 7 d, controls), the highest concentration of HEMA was 0.74 mmol/l (Tetric EvoFlow(®), methanol, 7 d, PF 35%), the highest concentration of DMABEE was 0.10 mmol/l (Ceram X(®) mono+, water, 7 d, PF 35%) and the highest concentration of BPA was 0.01 mmol/l (Admira, methanol, 7 d, controls).

Significance: Bleaching treatments can lead to a reduced or an increased elution of substances from the dental composites.

Keywords: Bleaching; Comonomer; Dental composite; Elution; Peroxide; Polymer network.

MeSH terms

  • Composite Resins / chemistry*
  • Drug Combinations
  • Gas Chromatography-Mass Spectrometry
  • Gels
  • Materials Testing
  • Methacrylates
  • Peroxides / chemistry*
  • Polyvinyls / chemistry*
  • Silorane Resins
  • Siloxanes
  • Urea / analogs & derivatives*
  • Urea / chemistry


  • CeramX
  • Clearfil AP-X
  • Composite Resins
  • Drug Combinations
  • Filtek Supreme
  • Gels
  • Methacrylates
  • Peroxides
  • Polyvinyls
  • Silorane Resins
  • Siloxanes
  • Tetric EvoCeram
  • admira
  • silorane composite resin
  • tetric flow composite resin
  • tooth-bleaching agent, Opalescence
  • Urea