Dentin Bond Strength of a New Self-Adhesive Resin Cement

Objective: To measure and compare the dentin bond strength of a new paste/paste dual-curable self-adhesive resin cement Maxcem Elite (Kerr)  with several commercial self-adhesive resin cements: G-Cem (GC America), Maxcem (Kerr), MonoCem (Shofu), Multilink Sprint (Multilink-Sp, Ivoclar), Unicem (3M ESPE), and Unicem Clicker (Unicem-Cl, 3M ESPE).  Method:  Dentin surface was first flattened with 600 grit SiC paper.  A bonding jig (Ultradent Products, Inc) with a cylindrical mold (D=2.38mm) was securely placed on the dentin surface and each cement was condensed into the mold, directly onto the un-etched and un-primed dentin surface.  The cement was allowed to self-cure under 85~90% relative humidity at 37°C for 30 minutes and the bonded specimens  (n=6 for each cement) were then stored in de-ionized water at 37șC for 24 hours before being subjected to shear force on an Instron mechanical tester.  Results:  ANOVA analysis revealed that the dentin bond strength of Maxem Elite is significantly (p < 0.001) higher than those of other cements.  

Dentin Shear Bond Strength, MPa
Maxcem Elite	Maxcem	Unicem	Multilink-Sp	Unicem-Cl	MonoCem	G-Cem
23.8±3.8a*	14.1±1.2b	11.6±3.7b,c	8.2±2.0c,d	8.1±2.5c,d	5.5±1.6d	5.5±4.0d

    *Means with different letters are statistically different at p < 0.05.

Conclusion:  Maxcem Elite had the highest dentin bond strength among all self-adhesive resin cements tested in this study.