Recently, a paper on monomer elution from resin-based composites by my research team has been accepted for publication in the leading peer-reviewed journal on dental materials. The paper is available online under "Articles in press" and awaits publication in the paper format of Dental Materials. For reprints, you may contact me at vesna.miletic@gmail.com
Dent Mater. 2010 Dec 17. [Epub ahead of print]
Monomer elution from nanohybrid and ormocer-based composites cured with different light sources
Manojlovic D, Radisic M, Vasiljevic T, Zivkovic S, Lausevic M, Miletic V.
University of Belgrade, School of Dentistry, Department of Restorative Dentistry
and Endodontics, Rankeova 4, 11000 Belgrade, Serbia.
OBJECTIVES: To study monomer elution from four resin-based composites (RBCs)cured with different light sources.
METHODS: Twenty-eight premolars were randomlyallocated to four groups. Standardized cavities were prepared and restored with ananohybrid (Filtek Supreme XT or Tetric EvoCeram), an ormocer (Admira) or a microhybrid RBC (Filtek Z250) which served as control. Buccal restorations were cured with a halogen and oral restorations with an LED light-curing unit. Elution of diurethane dimethacrylate (UDMA), Bisphenol A diglycidylether methacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA) and 2-hydroxyethyl methacrylate (HEMA) was analyzed using high-performance liquid chromatography (HPLC) 1h to 28 days post-immersion in 75% ethanol. Data were analyzed using multivariate and repeated measures analysis of variance (α=0.05).
RESULTS: The greatest elution of UDMA and BisGMA occurred from Tetric EvoCeram and the least from Filtek Z250 (p<0.05). LED and halogen light-curing units gave similar results for all RBCs (p>0.05) except Tetric EvoCeram which showed greater elution for the LED unit (p<0.05). TEGDMA was below the limit of quantification. HEMA eluted in similar concentrations from Filtek Supreme and Tetric EvoCeram (p>0.05).
SIGNIFICANCE: The two nanohybrid RBCs eluted more cross-linking monomers than the ormocer and the control microhybrid RBC. Continuous elution over 28 days indicates that RBCs act as a chronic source of monomers in clinical conditions. Light source may affect monomer elution since differences were found for one out of four RBCs. Mathematical models for elution kinetics of UDMA and BisGMA indicated two elution mechanisms.
Abstract
Dent Mater. 2010 Dec 17. [Epub ahead of print]
Monomer elution from nanohybrid and ormocer-based composites cured with different light sources
Manojlovic D, Radisic M, Vasiljevic T, Zivkovic S, Lausevic M, Miletic V.
University of Belgrade, School of Dentistry, Department of Restorative Dentistry
and Endodontics, Rankeova 4, 11000 Belgrade, Serbia.
OBJECTIVES: To study monomer elution from four resin-based composites (RBCs)cured with different light sources.
METHODS: Twenty-eight premolars were randomlyallocated to four groups. Standardized cavities were prepared and restored with ananohybrid (Filtek Supreme XT or Tetric EvoCeram), an ormocer (Admira) or a microhybrid RBC (Filtek Z250) which served as control. Buccal restorations were cured with a halogen and oral restorations with an LED light-curing unit. Elution of diurethane dimethacrylate (UDMA), Bisphenol A diglycidylether methacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA) and 2-hydroxyethyl methacrylate (HEMA) was analyzed using high-performance liquid chromatography (HPLC) 1h to 28 days post-immersion in 75% ethanol. Data were analyzed using multivariate and repeated measures analysis of variance (α=0.05).
RESULTS: The greatest elution of UDMA and BisGMA occurred from Tetric EvoCeram and the least from Filtek Z250 (p<0.05). LED and halogen light-curing units gave similar results for all RBCs (p>0.05) except Tetric EvoCeram which showed greater elution for the LED unit (p<0.05). TEGDMA was below the limit of quantification. HEMA eluted in similar concentrations from Filtek Supreme and Tetric EvoCeram (p>0.05).
SIGNIFICANCE: The two nanohybrid RBCs eluted more cross-linking monomers than the ormocer and the control microhybrid RBC. Continuous elution over 28 days indicates that RBCs act as a chronic source of monomers in clinical conditions. Light source may affect monomer elution since differences were found for one out of four RBCs. Mathematical models for elution kinetics of UDMA and BisGMA indicated two elution mechanisms.
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