Journal of Dental Research, Vol 68, 489-490, Copyright © 1989 by International & American Associations for Dental Research Online Journals
The influence of admixing microfiller to small-particle composite resin on wear, tensile strength, hardness, and surface roughness
P. Pallav, A. J. De Gee, C. L. Davidson, R. L. Erickson and E. A. Glasspoole
Department of Clinical Materials Science, ACTA, University of Amsterdam, The Netherlands.
A series of photo-initiated composite resins, with a Bis-GMA-TEGDMA resin
matrix, was investigated in vitro for occlusal wear, surface roughness,
diametral tensile strength, and hardness. The materials contained mixtures
of ground quartz (macrofiller, 3 microns) and colloidal silica
(microfiller, 0.04 micron), with total filler being constant at 68.5% by
volume. The study was conducted to determine the influence of an increasing
ratio of micro to macrofiller in the mixtures. When the macrofiller was
gradually replaced by 3, 5, 7.5, 10, 15, and 20 vol% of microfiller, wear
resistance increased substantially, ultimately to a constant level. Any
influence on surface roughness or tensile strength and hardness could not
be demonstrated.
