Figure 1.

Materials used in this study

Product	Code	Manufacturer	Powder/liquid ratio	Composition	Batch number	Polymerization/ gelation conditions
Tokuyama Rebase II	TR	Tokuyama Dental Corp.,Tokyo, Japan	2.056 g/1 mL	Powder - PEMA Liquid - AAEM and 1,9-nonanediol dimethacrylate	UF62694	8 min at room temperature
New Truliner	NT	The Bosworth Co., Skokie, IL, USA	1.34 g/1 mL	Powder - PEMA Liquid - IBMA and DBP	0409-495	10-15 min at room temperature
Ufi Gel hard	UH	Voco, Cuxhaven, Germany	2.12 g/1.2 mL	Powder - PEMA Liquid - 1,6-HDMA	571845	7 min at room temperature
Trusoft	T	The Bosworth Co., Skokie, IL, USA	1.06 g/1 mL	Powder - PEMA Liquid - Alkyl phthalate (plasticizer) and ethyl alcohol	0403-163	5 min at room temperature
Sofreliner	S	Tokuyama Dental Corp.,Tokyo, Japan	Auto-dispensing system	Polyorganosiloxane Silicone resin powder Silica	U684606	6.5 min at room temperature
Dentusil	D	The Bosworth Co., Skokie, IL, USA	Auto-dispensing system	Polyorganosiloxane Silica	702.073	5 min at room temperature
Lucitone 550	L	Dentsply Industria e Comercio Ltda., Petropolis, RJ, Brazil	2.1 gm/1 mL	Powder - PMMA Liquid - MMA and EDGMA	P- 303758 L- 59244	90 min at 73ºC and then 100ºC boiling water for 30 min

PEMA, poly (ethyl methacrylate); AAEM - 2-acetoacetoxy (ethyl) methacrylate; PMMA, poly (methyl methacrylate); IBMA, isobutyl methacrylate; DBP, di-n-butyl phthalate; 1,6-HDMA, 1,6-hexanediol dimethacrylate; MMA, (methyl methacrylate); EDGMA, (ethylene glycol dimethacrylate)