title: Leaching of monomers from bulk-fill composites: An in vitro study.
abstract: OBJECTIVE
  To evaluate the elution of bisphenol A-glycidyl methacrylate (BisGMA) and triethylene glycol dimethacrylate (TEGDMA) from two bulk-fill composites at different polymerization times, for different storage periods when cured with quartz-tungsten-halogen (QTH) curing unit.
  
  
  METHODS
  Tetric N-Ceram bulk fill and EverX Posterior were analyzed using high-performance liquid chromatography unit. Totally, 68 samples were prepared, two groups (n = 17) from both the composites, one for each tested polymerization time. Each sample was cured with a QTH curing unit, using soft-start curing technique and stored in 2 ml of ethanol for 24 h. Storage medium was renewed and then stored again for 1 week. Data acquired were statistically analyzed.
  
  
  RESULTS
  The elution of BisGMA was significantly higher from Tetric N-Ceram bulk fill and BisGMA and TEGDMA from EverX Posterior composite at the end of 24 h, irrespective of the curing time. In EverX Posterior, a higher amount of TEGDMA was eluted at the end of 24 h, while at the end of 1 week, significantly higher amount of BisGMA was released.
  
  
  CONCLUSIONS
  A significant amount of the release of BisGMA as well as TEGDMA was seen from both the composites when stored for different time intervals.
authors.affiliation: Department of Conservative Dentistry and Endodontics, A B Shetty Memorial Institute of Dental Sciences, Nitte University, Deralakatte, Karanataka, India.
authors.forename: Ankit Rajesh
authors.initials: AR
authors.lastname: Sajnani
authors.affiliation: Department of Conservative Dentistry and Endodontics, A B Shetty Memorial Institute of Dental Sciences, Nitte University, Deralakatte, Karanataka, India.
authors.forename: Mithra Nidharsh
authors.initials: MN
authors.lastname: Hegde
keywords: Bisphenol A-glycidyl methacrylate; bulk-fill composites; high-performance liquid chromatography; triethylene glycol dimethacrylate