Evaluation the effect of aluminum chloride on sheer bond strength of two steps and three steps etch- rinse bonding agents

Background & Aim: One of the important points in composite restorations is the bond strength, which, if reduced, can cause treatment failure and decay recurrence.One of the reasons for reducing the bond strength can be the use of homeostasis in restorations.Therefore, in this study, the effect of aluminum chloride hemostasis on the shear strength of three-step and two-step bonds was investigated.Materials and Methods: This experimental study was performed on forty human premolar teeth in four groups as follows: A: Aluminum chloride + Three-step bond + Composite.B: Aluminum chloride + two-step bond + Composite.C: Three-step bond + Composite.D: Two-step bond + composite.Then the shear strength of the bond was measured in MPa and compared in four groups with Kruskal Wallis test.Result: In the three-step, non-homeostasis bonding group, the shear bond strength was 53/8± 47/3 MPa and with the homeostasis it was 45/4±31/1 MPa, but this difference was not significant in these groups.(p < 0.8) In the two-step, non-homeostasis bonding group, the strength was 83.8 ± 35 MPa and with homeostasis was 56/7±27/9 MPa and the test showed that the hemostasis reduced the strength of bond.(p<0.1)Conclusion:The hemostasis substance does not seem to have an effect on the shear strength of the threestep bond, but it decreases the shear strength of the two-step bond.