Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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The polymerization efficiency of a bulk-fill composite based on matrix-modification technology

  • Elshazly, Tarek M. (Oral Technology, School of Dentistry, University of Bonn) ;
  • Bourauel, Christoph (Oral Technology, School of Dentistry, University of Bonn) ;
  • Aboushelib, Moustafa N. (Dental Biomaterials Department, Faculty of Dentistry, Alexandria University) ;
  • Sherief, Dalia I. (Biomaterials Department, Faculty of Dentistry, Ain Shams University) ;
  • El-Korashy, Dalia I. (Biomaterials Department, Faculty of Dentistry, Ain Shams University)
  • Received : 2019.12.03
  • Accepted : 2020.02.14
  • Published : 2020.08.31
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Abstract

Objectives: To evaluate the polymerization efficiency of a matrix-modified bulk-fill composite, and compare it to a conventional composite which has a similar filler system. The degree of conversion (DC%) and monomer elution were measured over different storage periods. Additionally, fillers' content was examined. Materials and Methods: Cylindrical specimens were prepared, in bulk and incrementally, from Filtek Bulk Fill (B) and Filtek Supreme XTE (S) composites using a Teflon mold, for each test (n = 6). Using attenuated total reflection method of Fourier transformation infrared spectroscopy, DC% was measured after 24 hours, 7 days, and 30 days. Using high-performance liquid chromatography, elution of hydroxyethyl methacrylate, triethylene glycol dimethacrylate, urethane dimethacrylate, and bisphenol-A glycidyl dimethacrylate was measured after 24 hours, 7 days and 30 days. Filler content was examined by scanning electron microscopy (SEM). Data were analyzed using 2-way mixed-model analysis of variance (α = 0.05). Results: There was no significant difference in DC% over different storage periods between B-bulk and S-incremental. Higher monomer elution was detected significantly from S than B. The elution quantity and rate varied significantly over storage periods and between different monomers. SEM images showed differences in fillers' sizes and agglomeration between both materials. Conclusions: Matrix-modified bulk-fill composites could be packed and cured in bulk with polymerization efficiency similar to conventional composites.

Keywords

References

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