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Consistency of resin composites for posterior use
N J Opdam1, J J Roeters, T C Peters
1TRIKON, Department of Cariology and Endodontology, University of Nijmegen, The Netherlands. n.opdam@dent.kun.nl
Objectives:
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.
Significance:
A ranking of posterior resin composites is presented to enable a material selection based on consistency.
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