Four types of opaquers , namely one powder-liquid ( Sinfony , 3M ESPE ) , and three paste opaquers [ ( Cimara , Voco ) , ( Monopaque , Ivoclar Vivadent ) , ( Cavex Experimental , Cavex ) ] were applied either in 0.25 or 0.50 mm thicknesses using standard polyethylene molds and photo-polymerized .
