EVALUATION OF SHEAR BOND STRENGTH AND FRACTOGRAPHIC ANALYSIS OF DIFFERENT SELF-ETCH ADHESIVE SYSTEMS (IN VITRO STUDY)

Objective : The purpose of this Invitro study is to measure the shear bond strength of new aqua bond contaminated in artificial saliva in comparison with two other universal adhesive composite bonding agents (tetric N bond universal, all bond universal).Materials and Methods A total of 36 dentin specimens were used in this study.These specimens were divided equally over the three adhesives (tetric N bond universal, all bond universal, and aqua bond universal).Then bonding protocol was followed according to manufacture instructions. Then composite buildup was completed. All specimens were thermo cycled for 500 cycles from 5 to 55 c. Then all specimens underwent shear bond test under universal testing machine and fractographic analysis by scanning electron microscope.Results: in the specimens related to tetric N bond universal the mean shear bond strength was 17.45 ± 4.14 after thermocycled. While in specimens related to all bond universal adhesive the mean value of shear bond strength was 13.81 ± 1.53 after thermocycled while in spacimens related to aqua bond the shear bond strength was 8.48 ± 2.85 after thermocycled .Fractographic analysis confirmed the shear bond strength results showing that the new aqua bond showed mainly mixed failure while the two other bonds system showed mainly adhesive failure when contaminated with saliva.Conclusion: shear bond strength was the least in aqua bond self-etch adhesive system than in other self-etch bond systems when contaminated with saliva.