title: Consistency of resin composites for posterior use.
abstract: OBJECTIVE
  The aim of this study was to compare a large set of resin composites suitable for application in stress-bearing areas on the basis of their consistency.
  
  
  METHODS
  A variety of posterior resin composites were tested using an apparatus that was originally designed for determination of the consistency of elastomeric impression materials (ISO 4823, 1992). The consistency of a standardized volume of resin composite was tested in a dark room at 23 degrees C by loading the samples during 60 s with 1625 g. After loading, the circumference of each sample was determined by a digitizer. Results were analyzed using Tukey-HSD multiple comparisons test and Student's t-tests.
  
  
  RESULTS
  The consistency of different brands of composites varied considerably. P50 was the material with the thinnest consistency. Significant differences (p < 0.05) in consistency were found between the same brands of material which were applied directly out of the syringe or out of a preloaded tip. Loading a Centrix tip with one composite out of a syringe resulted in a thinner consistency of the material than when taken directly from the syringe.
  
  
  CONCLUSIONS
  A ranking of posterior resin composites is presented to enable a material selection based on consistency.
authors.affiliation: TRIKON, Department of Cariology and Endodontology, University of Nijmegen, The Netherlands. n.opdam@dent.kun.nl
authors.forename: N J
authors.initials: NJ
authors.lastname: Opdam
authors.forename: J J
authors.initials: JJ
authors.lastname: Roeters
authors.forename: T C
authors.initials: TC
authors.lastname: Peters
authors.forename: R C
authors.initials: RC
authors.lastname: Burgersdijk
authors.forename: R H
authors.initials: RH
authors.lastname: Kuijs
mesh_terms: D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry* / Q000592:standards; D003793:Dental Restoration, Permanent / Q000379:methods*; D005069:Evaluation Studies as Topic; D008422:Materials Testing; D008963:Molar; D010316:Particle Size; D014783:Viscosity
chemical_list: D003188:Composite Resins