Objectives: To evaluate several properties of an experimental dual cure, paste-paste self-adhesive resin cement (SAC) and compare the properties of this SAC cement with two commercial SAC cements. Materials and Methods: Pentron experimental all-purpose SAC cement (APcem) and commercial SAC cements Maxcem (Kerr) and Unicem (3MESPE) were tested. The three SAC cements were bonded directly to three different substrates (n=6): dentin, zirconium oxide, and rexillium alloy (RX-3). Simile^® (Pentron) LC composite was used for the direct build-up of the composite cylinder (3 X 3.5 mm) on the cured cement surfaces. The composite was cured for 30 seconds twice around the cylinder.  The samples were then stored at 37 °C in H₂O for 24 hours before test. Shear bond strengths (SBS) was tested with a BenCore testing apparatus (Danville Engineering, CA) on an ATS Universal Testing Machine. Modulus of Rupture (MOR), water absorption (WA) and water solubility (WS) of the three cements were tested according to ISO 4049. The cements were self-cured for 1 hour and then stored at 37 °C in water for 24 hrs for MOR and 1 week for WA and WS. Results: Shear bonding strength, MOR, WA and WS test results are listed in the table. One-Way ANOVA showed statistical difference among the testing groups.

SAC	SBS (MPa)  for different substrate			MOR	WA/WS
Cement	dentin	ZrO2	RX-3	(MPa)	(mg/mm3/wk)
APcem	18.2 (2.8)	11.3 (1.6)	19.4 (4.5)	94 (4)	38 /15
Maxcem	8.1 (1.0)	3.8 (1.4)	8.3 (2.1)	38 (9)	23 /42
Unicem	12.9 (6.2)	4.3(0.1)	14.8 (4.8)	39 (9)	23 /21

<>Conclusion: In comparison with Maxcem and Unicem, the experimental APcem showed better performance in bonding and physical properties tested.