DUAL-CURE RESIN CEMENTS - IN-VITRO WEAR AND EFFECT OF QUANTITY OF REMAINING DOUBLE-BONDS, FILLER VOLUME, AND LIGHT CURING

The present study measured in vitro occlusal wear, quantity of remaini ng double bonds, and volumetric filler content of eight dual-cure resi n cements. Furthermore, the effect of light curing on wear and quantit y of remaining double bonds was evaluated. The filler content varied b etween 31 vol% and 66 vol%. In vitro wear varied between 30 mu m and 6 5 mu m, and quantity of remaining double bonds between 19% and 38% whe n resin cements had been both chemically cured and light cured. When l ight curing had been omitted, wear varied between 36 mu m and 74 mu m, and quantity of remaining double bonds between 25% and 56%. One resin cement did not harden when nor cured by Light. Light curing improved the wear resistance of three resin cements by up to 44% and reduced th e quantity of remaining double bonds of six cements by up to 36%. A th ree-dimensional regression analysis found wear to decrease with decrea sing quantity of remaining double bonds and increasing volumetric fill er content. A negative correlation was shown between compressive stren gth and wear.