title: Radiopacity of bulk fill flowable resin composite materials.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the radiopacity of currently marketed bulk fill flowable dental composite materials (Beautifil Bulk Flowable, SDR Flow, Filtek Bulk Fill Flow, and x-tra Base Bulk Fill).
  
  
  METHODS
  Six specimens of each material with a thickness of 1 mm were prepared, and digital radiographs were taken, using a CCD sensor along with an aluminum stepwedge and 1 mm-thick tooth slice. The mean gray level of each aluminum stepwedge and selected materials was measured, using the equal-density area tool of Kodak Dental Imaging software. The equivalent thickness of aluminum for each material was then calculated by using the stepwedge values in the CurveExpert version 1.4 program.
  
  
  RESULTS
  The radiopacity of bulk fill flowable composites sorted in descending order as follows: Beautifil Bulk Flowable (2.96 mm Al) = x-tra base bulk fill (2.92 mm Al) = SureFil SDR Flow (2.89 mm Al) > Filtek Bulk Fill Flow (2.51 mm Al) (P < 0.05).
  
  
  CONCLUSIONS
  As all materials had a radiopacity greater than dentin and enamel; their adequate radiopacity will help the clinicians during radiographic examination of restorations.
  
  
  CONCLUSIONS
  Bulk fill composite materials have greater radiopacity, enabling clinicians to distinguish the bulk fill composites from dentin and enamel.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
authors.forename: T
authors.initials: T
authors.lastname: Yildirim
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Biruni University, Istanbul, Turkey.
authors.forename: M K
authors.initials: MK
authors.lastname: Ayar
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
authors.forename: M S
authors.initials: MS
authors.lastname: Akdag
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
authors.forename: C
authors.initials: C
authors.lastname: Yesilyurt
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins / Q000737:chemistry*; D003743:Dental Enamel / Q000000981:diagnostic imaging; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000000981:diagnostic imaging; D006801:Humans; D008422:Materials Testing; D019252:Radiography, Dental, Digital / Q000379:methods*; D014070:Tooth
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; C000614713:Filtek Bulk Fill; C553871:Surefil SDR Flow; C111840:flowable hybrid composite; C041289:Radio-Opaque acrylic resin