Rp. Pagniano et Wm. Johnston, 3-YEAR EFFECT OF UNFILLED RESIN DILUTION ON WATER SORPTION OF A LIGHT-CURED MICROFILL AND HYBRID COMPOSITE RESIN, The Journal of prosthetic dentistry, 75(4), 1996, pp. 364-366
This in vitro study compared water sorption for various intervals over
a 3-year period for visible light cured microfill and hybrid composit
e resin with and without unfilled resin dilutions. Statistically signi
ficant sorption increases were evident for the 960-day interval for ce
rtain dilutions. At 3 years the microfill control revealed a 0.72% rel
ative water sorption increase and its various dilutions 1.92% to 2.36%
. By comparison, the hybrid control exhibited an increase of 0.4% and
its dilutions were 0.72% to 0.98%.