Mohamed Abdel Moneim Ahmed, Moustafa Mohamed Ahmed Hassan And Gehan Abdel-Moneim El Olimy,

ABSTRACT
Background: The Success Of Sandwich Technique Clinically Dependent On Adequate Bond Strength Between Resin Modified Glass Ionomer (RMGIC) And Resin Composite (RC). Aim Of The Study: To Evaluate And Compare The Role Of Newer Dental Adhesives In Bonding Composite Resin To (RMGIC) Liner. Material And Methods : Forty-five Specimens (4mm ? 9mm) Were Prepared By A Plexiglass Mold With Wells Prepared By Drilling Holes To Retain Resin-modified Glass Ionomer And Composite Resin The Specimen Were Randomly Divided Into Three Groups Of 15 Each : In Group I No Adhesive Was Applied Between The Two Materials, In Group II A Universal Self-etch Adhesive Single Bond 3M (SB) Was Applied And In Group III Universal Self-etch Adhesive Futurabond VOCO (FB) Was Applied. After Curing All The Specimen Were Thermo Cycled And Stored For 1 Month In Artificial Saliva In 100% Humidity At 37 Co. The Shear Bond Strength (SBS) Test Was Performed At A Crosshead Speed Of 0.5mm/min.and Calculated In Mega Pascal (MPa) The Specimens Were Examined Using Stereomicroscope At A Magnification Of 40x To Detect The Mode Of Failure , The Results Were Calculated And Analyzed Using Analysis Of Variance (ANOVA) And Post Hock- Test (P<0.05).

Results: The Mean (SBS) Of Groups 1-3 Were 7.2, 8.9, 10.5 MPa Respectively, Post Hock Test Was Used To Compare Between The Groups, A High Significant Difference Was Found Between Group I And Group III (P<0.05), No Significant Difference Was Observed Between Other Groups, (FB) Showed Higher Bond Strength Than (SB), Cohesive Failure Was The Most Common Failure Mode Observed, Followed By Mixed Mode Of Failure And Only On Adhesive Failure Mode Was Observed. Conclusion: SBS Increases Significantly With The Application Of The Adhesive Agent, The Bond Strength Between (RMGIC) And (RC) Could Vary Depending On The Type Of Adhesive.