THE EFFECT OF FINISHING TOOLS AND FINISHING TIME ON SURFACE ROUGHNESS OF BULK FILL COMPOSITE

Abstract

This in -vitro study was performed to evaluate the effect of finishing tools and time of finishing on the surface roughness of one type of bulk fill resin composite. A total of 70 bulk fill resin composite specimens prepared from specially constructed split Teflon molds of 8 mm diameter and 2 mm thickness were used for this study .The specimens were divided into four main groups(n=14) according to finishing procedures: (I) finishing diamond bur + silicone impregnated rubber polishers ( jiffy polishers). (II) finishing diamond bur +(aluminum oxide discs) stem polishing discs.(III) finishing carbide bur+ silicone impregnated rubber polishers( jiffy polishers).(V) finishing carbide bur +aluminum oxide discs (stem polishing discs) . Each group was further divided into two subgroups(n=7) according to finishing time (immediate and delayed (after 24 hours). In addition, fourteen specimens which did not receive further treatment after curing against a Mylar matrix strip(control group), surface roughness was measured immediately after curing for seven specimens of control and other seven specimens after 24 hours.