Table 1.

Materials used in the present study. UDMA, urethane dimethacrylate; TCB, a reaction product ofbutane tetracarboxylic acid and hydroxyl methyl methacrylate; TEGDMA, triethylene glycol dimethacrylate; HEMA, hydroxyl ethyl methacrylate.

Product	Type	Compositions	Filler ratio (weight)	Manufacturer
Dyract XP	Compomer	UDMA, TCB, TEGDMA, strontium-alumino-sodium-fluoro-phosphor-silicate glass	%73	Dentsplay, Germany
Photac-Fil Quick Aplicap	Resin-modified glass ionomers	Poly(co-acrylic acid/maleic acid), HEMA, hydrophilic monomers, fluoro-alumino-silicate glass	%76	ESPE GmbH, Seefeld, Germany
GC Fuji II LC	Resin-modified glass ionomers	HEMA, TEGDMA, poly acyrilic acid, fluoro-alumino-silicate glass	%58	GC Corp., Tokyo, Japan
GCP Glass Fill	Glass carbomer	fluoroaluminosilicate glass, apatite, polyacids		GCP Dental, Ridderkerk, Netherlands